David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 1 | /* |
| 2 | * libslirp glue |
| 3 | * |
| 4 | * Copyright (c) 2004-2008 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | #include "qemu-common.h" |
| 25 | #include "qemu-char.h" |
| 26 | #include "slirp.h" |
| 27 | #include "hw/hw.h" |
| 28 | |
| 29 | /* host address */ |
| 30 | struct in_addr our_addr; |
| 31 | /* host dns address */ |
| 32 | struct in_addr dns_addr; |
| 33 | /* host loopback address */ |
| 34 | struct in_addr loopback_addr; |
| 35 | |
| 36 | /* address for slirp virtual addresses */ |
| 37 | struct in_addr special_addr; |
| 38 | /* virtual address alias for host */ |
| 39 | struct in_addr alias_addr; |
| 40 | |
| 41 | static const uint8_t special_ethaddr[6] = { |
| 42 | 0x52, 0x54, 0x00, 0x12, 0x35, 0x00 |
| 43 | }; |
| 44 | |
| 45 | /* ARP cache for the guest IP addresses (XXX: allow many entries) */ |
| 46 | uint8_t client_ethaddr[6]; |
| 47 | static struct in_addr client_ipaddr; |
| 48 | |
| 49 | static const uint8_t zero_ethaddr[6] = { 0, 0, 0, 0, 0, 0 }; |
| 50 | |
| 51 | const char *slirp_special_ip = CTL_SPECIAL; |
| 52 | int slirp_restrict; |
| 53 | static int do_slowtimo; |
| 54 | int link_up; |
| 55 | struct timeval tt; |
| 56 | FILE *lfd; |
| 57 | struct ex_list *exec_list; |
| 58 | |
| 59 | /* XXX: suppress those select globals */ |
| 60 | fd_set *global_readfds, *global_writefds, *global_xfds; |
| 61 | |
| 62 | char slirp_hostname[33]; |
| 63 | |
| 64 | #ifdef _WIN32 |
| 65 | |
| 66 | static int get_dns_addr(struct in_addr *pdns_addr) |
| 67 | { |
| 68 | FIXED_INFO *FixedInfo=NULL; |
| 69 | ULONG BufLen; |
| 70 | DWORD ret; |
| 71 | IP_ADDR_STRING *pIPAddr; |
| 72 | struct in_addr tmp_addr; |
| 73 | |
| 74 | FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO)); |
| 75 | BufLen = sizeof(FIXED_INFO); |
| 76 | |
| 77 | if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) { |
| 78 | if (FixedInfo) { |
| 79 | GlobalFree(FixedInfo); |
| 80 | FixedInfo = NULL; |
| 81 | } |
| 82 | FixedInfo = GlobalAlloc(GPTR, BufLen); |
| 83 | } |
| 84 | |
| 85 | if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) { |
| 86 | printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret ); |
| 87 | if (FixedInfo) { |
| 88 | GlobalFree(FixedInfo); |
| 89 | FixedInfo = NULL; |
| 90 | } |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | pIPAddr = &(FixedInfo->DnsServerList); |
| 95 | inet_aton(pIPAddr->IpAddress.String, &tmp_addr); |
| 96 | *pdns_addr = tmp_addr; |
| 97 | #if 0 |
| 98 | printf( "DNS Servers:\n" ); |
| 99 | printf( "DNS Addr:%s\n", pIPAddr->IpAddress.String ); |
| 100 | |
| 101 | pIPAddr = FixedInfo -> DnsServerList.Next; |
| 102 | while ( pIPAddr ) { |
| 103 | printf( "DNS Addr:%s\n", pIPAddr ->IpAddress.String ); |
| 104 | pIPAddr = pIPAddr ->Next; |
| 105 | } |
| 106 | #endif |
| 107 | if (FixedInfo) { |
| 108 | GlobalFree(FixedInfo); |
| 109 | FixedInfo = NULL; |
| 110 | } |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | #else |
| 115 | |
| 116 | static int get_dns_addr(struct in_addr *pdns_addr) |
| 117 | { |
| 118 | char buff[512]; |
| 119 | char buff2[257]; |
| 120 | FILE *f; |
| 121 | int found = 0; |
| 122 | struct in_addr tmp_addr; |
| 123 | |
| 124 | f = fopen("/etc/resolv.conf", "r"); |
| 125 | if (!f) |
| 126 | return -1; |
| 127 | |
| 128 | #ifdef DEBUG |
| 129 | lprint("IP address of your DNS(s): "); |
| 130 | #endif |
| 131 | while (fgets(buff, 512, f) != NULL) { |
| 132 | if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) { |
| 133 | if (!inet_aton(buff2, &tmp_addr)) |
| 134 | continue; |
| 135 | if (tmp_addr.s_addr == loopback_addr.s_addr) |
| 136 | tmp_addr = our_addr; |
| 137 | /* If it's the first one, set it to dns_addr */ |
| 138 | if (!found) |
| 139 | *pdns_addr = tmp_addr; |
| 140 | #ifdef DEBUG |
| 141 | else |
| 142 | lprint(", "); |
| 143 | #endif |
| 144 | if (++found > 3) { |
| 145 | #ifdef DEBUG |
| 146 | lprint("(more)"); |
| 147 | #endif |
| 148 | break; |
| 149 | } |
| 150 | #ifdef DEBUG |
| 151 | else |
| 152 | lprint("%s", inet_ntoa(tmp_addr)); |
| 153 | #endif |
| 154 | } |
| 155 | } |
| 156 | fclose(f); |
| 157 | if (!found) |
| 158 | return -1; |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | #endif |
| 163 | |
| 164 | #ifdef _WIN32 |
| 165 | static void slirp_cleanup(void) |
| 166 | { |
| 167 | WSACleanup(); |
| 168 | } |
| 169 | #endif |
| 170 | |
| 171 | static void slirp_state_save(QEMUFile *f, void *opaque); |
| 172 | static int slirp_state_load(QEMUFile *f, void *opaque, int version_id); |
| 173 | |
| 174 | void slirp_init(int restricted, const char *special_ip) |
| 175 | { |
| 176 | // debug_init("/tmp/slirp.log", DEBUG_DEFAULT); |
| 177 | |
| 178 | #ifdef _WIN32 |
| 179 | { |
| 180 | WSADATA Data; |
| 181 | WSAStartup(MAKEWORD(2,0), &Data); |
| 182 | atexit(slirp_cleanup); |
| 183 | } |
| 184 | #endif |
| 185 | |
| 186 | link_up = 1; |
| 187 | slirp_restrict = restricted; |
| 188 | |
| 189 | if_init(); |
| 190 | ip_init(); |
| 191 | |
| 192 | /* Initialise mbufs *after* setting the MTU */ |
| 193 | m_init(); |
| 194 | |
| 195 | /* set default addresses */ |
| 196 | inet_aton("127.0.0.1", &loopback_addr); |
| 197 | |
| 198 | if (get_dns_addr(&dns_addr) < 0) { |
| 199 | dns_addr = loopback_addr; |
| 200 | fprintf (stderr, "Warning: No DNS servers found\n"); |
| 201 | } |
| 202 | |
| 203 | if (special_ip) |
| 204 | slirp_special_ip = special_ip; |
| 205 | |
| 206 | inet_aton(slirp_special_ip, &special_addr); |
| 207 | alias_addr.s_addr = special_addr.s_addr | htonl(CTL_ALIAS); |
| 208 | getouraddr(); |
| 209 | register_savevm("slirp", 0, 1, slirp_state_save, slirp_state_load, NULL); |
| 210 | } |
| 211 | |
| 212 | #define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) |
| 213 | #define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) |
| 214 | #define UPD_NFDS(x) if (nfds < (x)) nfds = (x) |
| 215 | |
| 216 | /* |
| 217 | * curtime kept to an accuracy of 1ms |
| 218 | */ |
| 219 | #ifdef _WIN32 |
| 220 | static void updtime(void) |
| 221 | { |
| 222 | struct _timeb tb; |
| 223 | |
| 224 | _ftime(&tb); |
| 225 | curtime = (u_int)tb.time * (u_int)1000; |
| 226 | curtime += (u_int)tb.millitm; |
| 227 | } |
| 228 | #else |
| 229 | static void updtime(void) |
| 230 | { |
| 231 | gettimeofday(&tt, NULL); |
| 232 | |
| 233 | curtime = (u_int)tt.tv_sec * (u_int)1000; |
| 234 | curtime += (u_int)tt.tv_usec / (u_int)1000; |
| 235 | |
| 236 | if ((tt.tv_usec % 1000) >= 500) |
| 237 | curtime++; |
| 238 | } |
| 239 | #endif |
| 240 | |
| 241 | void slirp_select_fill(int *pnfds, |
| 242 | fd_set *readfds, fd_set *writefds, fd_set *xfds) |
| 243 | { |
| 244 | struct socket *so, *so_next; |
| 245 | struct timeval timeout; |
| 246 | int nfds; |
| 247 | int tmp_time; |
| 248 | |
| 249 | /* fail safe */ |
| 250 | global_readfds = NULL; |
| 251 | global_writefds = NULL; |
| 252 | global_xfds = NULL; |
| 253 | |
| 254 | nfds = *pnfds; |
| 255 | /* |
| 256 | * First, TCP sockets |
| 257 | */ |
| 258 | do_slowtimo = 0; |
| 259 | if (link_up) { |
| 260 | /* |
| 261 | * *_slowtimo needs calling if there are IP fragments |
| 262 | * in the fragment queue, or there are TCP connections active |
| 263 | */ |
| 264 | do_slowtimo = ((tcb.so_next != &tcb) || |
| 265 | (&ipq.ip_link != ipq.ip_link.next)); |
| 266 | |
| 267 | for (so = tcb.so_next; so != &tcb; so = so_next) { |
| 268 | so_next = so->so_next; |
| 269 | |
| 270 | /* |
| 271 | * See if we need a tcp_fasttimo |
| 272 | */ |
| 273 | if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK) |
| 274 | time_fasttimo = curtime; /* Flag when we want a fasttimo */ |
| 275 | |
| 276 | /* |
| 277 | * NOFDREF can include still connecting to local-host, |
| 278 | * newly socreated() sockets etc. Don't want to select these. |
| 279 | */ |
| 280 | if (so->so_state & SS_NOFDREF || so->s == -1) |
| 281 | continue; |
| 282 | |
| 283 | /* |
| 284 | * Set for reading sockets which are accepting |
| 285 | */ |
| 286 | if (so->so_state & SS_FACCEPTCONN) { |
| 287 | FD_SET(so->s, readfds); |
| 288 | UPD_NFDS(so->s); |
| 289 | continue; |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Set for writing sockets which are connecting |
| 294 | */ |
| 295 | if (so->so_state & SS_ISFCONNECTING) { |
| 296 | FD_SET(so->s, writefds); |
| 297 | UPD_NFDS(so->s); |
| 298 | continue; |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Set for writing if we are connected, can send more, and |
| 303 | * we have something to send |
| 304 | */ |
| 305 | if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) { |
| 306 | FD_SET(so->s, writefds); |
| 307 | UPD_NFDS(so->s); |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * Set for reading (and urgent data) if we are connected, can |
| 312 | * receive more, and we have room for it XXX /2 ? |
| 313 | */ |
| 314 | if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) { |
| 315 | FD_SET(so->s, readfds); |
| 316 | FD_SET(so->s, xfds); |
| 317 | UPD_NFDS(so->s); |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * UDP sockets |
| 323 | */ |
| 324 | for (so = udb.so_next; so != &udb; so = so_next) { |
| 325 | so_next = so->so_next; |
| 326 | |
| 327 | /* |
| 328 | * See if it's timed out |
| 329 | */ |
| 330 | if (so->so_expire) { |
| 331 | if (so->so_expire <= curtime) { |
| 332 | udp_detach(so); |
| 333 | continue; |
| 334 | } else |
| 335 | do_slowtimo = 1; /* Let socket expire */ |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * When UDP packets are received from over the |
| 340 | * link, they're sendto()'d straight away, so |
| 341 | * no need for setting for writing |
| 342 | * Limit the number of packets queued by this session |
| 343 | * to 4. Note that even though we try and limit this |
| 344 | * to 4 packets, the session could have more queued |
| 345 | * if the packets needed to be fragmented |
| 346 | * (XXX <= 4 ?) |
| 347 | */ |
| 348 | if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) { |
| 349 | FD_SET(so->s, readfds); |
| 350 | UPD_NFDS(so->s); |
| 351 | } |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Setup timeout to use minimum CPU usage, especially when idle |
| 357 | */ |
| 358 | |
| 359 | /* |
| 360 | * First, see the timeout needed by *timo |
| 361 | */ |
| 362 | timeout.tv_sec = 0; |
| 363 | timeout.tv_usec = -1; |
| 364 | /* |
| 365 | * If a slowtimo is needed, set timeout to 500ms from the last |
| 366 | * slow timeout. If a fast timeout is needed, set timeout within |
| 367 | * 200ms of when it was requested. |
| 368 | */ |
| 369 | if (do_slowtimo) { |
| 370 | /* XXX + 10000 because some select()'s aren't that accurate */ |
| 371 | timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000; |
| 372 | if (timeout.tv_usec < 0) |
| 373 | timeout.tv_usec = 0; |
| 374 | else if (timeout.tv_usec > 510000) |
| 375 | timeout.tv_usec = 510000; |
| 376 | |
| 377 | /* Can only fasttimo if we also slowtimo */ |
| 378 | if (time_fasttimo) { |
| 379 | tmp_time = (200 - (curtime - time_fasttimo)) * 1000; |
| 380 | if (tmp_time < 0) |
| 381 | tmp_time = 0; |
| 382 | |
| 383 | /* Choose the smallest of the 2 */ |
| 384 | if (tmp_time < timeout.tv_usec) |
| 385 | timeout.tv_usec = (u_int)tmp_time; |
| 386 | } |
| 387 | } |
| 388 | *pnfds = nfds; |
| 389 | } |
| 390 | |
| 391 | void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds) |
| 392 | { |
| 393 | struct socket *so, *so_next; |
| 394 | int ret; |
| 395 | |
| 396 | global_readfds = readfds; |
| 397 | global_writefds = writefds; |
| 398 | global_xfds = xfds; |
| 399 | |
| 400 | /* Update time */ |
| 401 | updtime(); |
| 402 | |
| 403 | /* |
| 404 | * See if anything has timed out |
| 405 | */ |
| 406 | if (link_up) { |
| 407 | if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) { |
| 408 | tcp_fasttimo(); |
| 409 | time_fasttimo = 0; |
| 410 | } |
| 411 | if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) { |
| 412 | ip_slowtimo(); |
| 413 | tcp_slowtimo(); |
| 414 | last_slowtimo = curtime; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Check sockets |
| 420 | */ |
| 421 | if (link_up) { |
| 422 | /* |
| 423 | * Check TCP sockets |
| 424 | */ |
| 425 | for (so = tcb.so_next; so != &tcb; so = so_next) { |
| 426 | so_next = so->so_next; |
| 427 | |
| 428 | /* |
| 429 | * FD_ISSET is meaningless on these sockets |
| 430 | * (and they can crash the program) |
| 431 | */ |
| 432 | if (so->so_state & SS_NOFDREF || so->s == -1) |
| 433 | continue; |
| 434 | |
| 435 | /* |
| 436 | * Check for URG data |
| 437 | * This will soread as well, so no need to |
| 438 | * test for readfds below if this succeeds |
| 439 | */ |
| 440 | if (FD_ISSET(so->s, xfds)) |
| 441 | sorecvoob(so); |
| 442 | /* |
| 443 | * Check sockets for reading |
| 444 | */ |
| 445 | else if (FD_ISSET(so->s, readfds)) { |
| 446 | /* |
| 447 | * Check for incoming connections |
| 448 | */ |
| 449 | if (so->so_state & SS_FACCEPTCONN) { |
| 450 | tcp_connect(so); |
| 451 | continue; |
| 452 | } /* else */ |
| 453 | ret = soread(so); |
| 454 | |
| 455 | /* Output it if we read something */ |
| 456 | if (ret > 0) |
| 457 | tcp_output(sototcpcb(so)); |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * Check sockets for writing |
| 462 | */ |
| 463 | if (FD_ISSET(so->s, writefds)) { |
| 464 | /* |
| 465 | * Check for non-blocking, still-connecting sockets |
| 466 | */ |
| 467 | if (so->so_state & SS_ISFCONNECTING) { |
| 468 | /* Connected */ |
| 469 | so->so_state &= ~SS_ISFCONNECTING; |
| 470 | |
| 471 | ret = send(so->s, (const void *) &ret, 0, 0); |
| 472 | if (ret < 0) { |
| 473 | /* XXXXX Must fix, zero bytes is a NOP */ |
| 474 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
| 475 | errno == EINPROGRESS || errno == ENOTCONN) |
| 476 | continue; |
| 477 | |
| 478 | /* else failed */ |
| 479 | so->so_state = SS_NOFDREF; |
| 480 | } |
| 481 | /* else so->so_state &= ~SS_ISFCONNECTING; */ |
| 482 | |
| 483 | /* |
| 484 | * Continue tcp_input |
| 485 | */ |
| 486 | tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); |
| 487 | /* continue; */ |
| 488 | } else |
| 489 | ret = sowrite(so); |
| 490 | /* |
| 491 | * XXXXX If we wrote something (a lot), there |
| 492 | * could be a need for a window update. |
| 493 | * In the worst case, the remote will send |
| 494 | * a window probe to get things going again |
| 495 | */ |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Probe a still-connecting, non-blocking socket |
| 500 | * to check if it's still alive |
| 501 | */ |
| 502 | #ifdef PROBE_CONN |
| 503 | if (so->so_state & SS_ISFCONNECTING) { |
| 504 | ret = recv(so->s, (char *)&ret, 0,0); |
| 505 | |
| 506 | if (ret < 0) { |
| 507 | /* XXX */ |
| 508 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
| 509 | errno == EINPROGRESS || errno == ENOTCONN) |
| 510 | continue; /* Still connecting, continue */ |
| 511 | |
| 512 | /* else failed */ |
| 513 | so->so_state = SS_NOFDREF; |
| 514 | |
| 515 | /* tcp_input will take care of it */ |
| 516 | } else { |
| 517 | ret = send(so->s, &ret, 0,0); |
| 518 | if (ret < 0) { |
| 519 | /* XXX */ |
| 520 | if (errno == EAGAIN || errno == EWOULDBLOCK || |
| 521 | errno == EINPROGRESS || errno == ENOTCONN) |
| 522 | continue; |
| 523 | /* else failed */ |
| 524 | so->so_state = SS_NOFDREF; |
| 525 | } else |
| 526 | so->so_state &= ~SS_ISFCONNECTING; |
| 527 | |
| 528 | } |
| 529 | tcp_input((struct mbuf *)NULL, sizeof(struct ip),so); |
| 530 | } /* SS_ISFCONNECTING */ |
| 531 | #endif |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * Now UDP sockets. |
| 536 | * Incoming packets are sent straight away, they're not buffered. |
| 537 | * Incoming UDP data isn't buffered either. |
| 538 | */ |
| 539 | for (so = udb.so_next; so != &udb; so = so_next) { |
| 540 | so_next = so->so_next; |
| 541 | |
| 542 | if (so->s != -1 && FD_ISSET(so->s, readfds)) { |
| 543 | sorecvfrom(so); |
| 544 | } |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * See if we can start outputting |
| 550 | */ |
| 551 | if (if_queued && link_up) |
| 552 | if_start(); |
| 553 | |
| 554 | /* clear global file descriptor sets. |
| 555 | * these reside on the stack in vl.c |
| 556 | * so they're unusable if we're not in |
| 557 | * slirp_select_fill or slirp_select_poll. |
| 558 | */ |
| 559 | global_readfds = NULL; |
| 560 | global_writefds = NULL; |
| 561 | global_xfds = NULL; |
| 562 | } |
| 563 | |
| 564 | #define ETH_ALEN 6 |
| 565 | #define ETH_HLEN 14 |
| 566 | |
| 567 | #define ETH_P_IP 0x0800 /* Internet Protocol packet */ |
| 568 | #define ETH_P_ARP 0x0806 /* Address Resolution packet */ |
| 569 | |
| 570 | #define ARPOP_REQUEST 1 /* ARP request */ |
| 571 | #define ARPOP_REPLY 2 /* ARP reply */ |
| 572 | |
| 573 | struct ethhdr |
| 574 | { |
| 575 | unsigned char h_dest[ETH_ALEN]; /* destination eth addr */ |
| 576 | unsigned char h_source[ETH_ALEN]; /* source ether addr */ |
| 577 | unsigned short h_proto; /* packet type ID field */ |
| 578 | }; |
| 579 | |
| 580 | struct arphdr |
| 581 | { |
| 582 | unsigned short ar_hrd; /* format of hardware address */ |
| 583 | unsigned short ar_pro; /* format of protocol address */ |
| 584 | unsigned char ar_hln; /* length of hardware address */ |
| 585 | unsigned char ar_pln; /* length of protocol address */ |
| 586 | unsigned short ar_op; /* ARP opcode (command) */ |
| 587 | |
| 588 | /* |
| 589 | * Ethernet looks like this : This bit is variable sized however... |
| 590 | */ |
| 591 | unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ |
| 592 | unsigned char ar_sip[4]; /* sender IP address */ |
| 593 | unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ |
| 594 | unsigned char ar_tip[4]; /* target IP address */ |
| 595 | }; |
| 596 | |
| 597 | static void arp_input(const uint8_t *pkt, int pkt_len) |
| 598 | { |
| 599 | struct ethhdr *eh = (struct ethhdr *)pkt; |
| 600 | struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN); |
| 601 | uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)]; |
| 602 | struct ethhdr *reh = (struct ethhdr *)arp_reply; |
| 603 | struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN); |
| 604 | int ar_op; |
| 605 | struct ex_list *ex_ptr; |
| 606 | |
| 607 | ar_op = ntohs(ah->ar_op); |
| 608 | switch(ar_op) { |
| 609 | case ARPOP_REQUEST: |
| 610 | if (!memcmp(ah->ar_tip, &special_addr, 3)) { |
| 611 | if (ah->ar_tip[3] == CTL_DNS || ah->ar_tip[3] == CTL_ALIAS) |
| 612 | goto arp_ok; |
| 613 | for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { |
| 614 | if (ex_ptr->ex_addr == ah->ar_tip[3]) |
| 615 | goto arp_ok; |
| 616 | } |
| 617 | return; |
| 618 | arp_ok: |
| 619 | /* XXX: make an ARP request to have the client address */ |
| 620 | memcpy(client_ethaddr, eh->h_source, ETH_ALEN); |
| 621 | |
| 622 | /* ARP request for alias/dns mac address */ |
| 623 | memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN); |
| 624 | memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1); |
| 625 | reh->h_source[5] = ah->ar_tip[3]; |
| 626 | reh->h_proto = htons(ETH_P_ARP); |
| 627 | |
| 628 | rah->ar_hrd = htons(1); |
| 629 | rah->ar_pro = htons(ETH_P_IP); |
| 630 | rah->ar_hln = ETH_ALEN; |
| 631 | rah->ar_pln = 4; |
| 632 | rah->ar_op = htons(ARPOP_REPLY); |
| 633 | memcpy(rah->ar_sha, reh->h_source, ETH_ALEN); |
| 634 | memcpy(rah->ar_sip, ah->ar_tip, 4); |
| 635 | memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN); |
| 636 | memcpy(rah->ar_tip, ah->ar_sip, 4); |
| 637 | slirp_output(arp_reply, sizeof(arp_reply)); |
| 638 | } |
| 639 | break; |
| 640 | case ARPOP_REPLY: |
| 641 | /* reply to request of client mac address ? */ |
| 642 | if (!memcmp(client_ethaddr, zero_ethaddr, ETH_ALEN) && |
| 643 | !memcmp(ah->ar_sip, &client_ipaddr.s_addr, 4)) { |
| 644 | memcpy(client_ethaddr, ah->ar_sha, ETH_ALEN); |
| 645 | } |
| 646 | break; |
| 647 | default: |
| 648 | break; |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | void slirp_input(const uint8_t *pkt, int pkt_len) |
| 653 | { |
| 654 | struct mbuf *m; |
| 655 | int proto; |
| 656 | |
| 657 | if (pkt_len < ETH_HLEN) |
| 658 | return; |
| 659 | |
| 660 | proto = ntohs(*(uint16_t *)(pkt + 12)); |
| 661 | switch(proto) { |
| 662 | case ETH_P_ARP: |
| 663 | arp_input(pkt, pkt_len); |
| 664 | break; |
| 665 | case ETH_P_IP: |
| 666 | m = m_get(); |
| 667 | if (!m) |
| 668 | return; |
| 669 | /* Note: we add to align the IP header */ |
| 670 | if (M_FREEROOM(m) < pkt_len + 2) { |
| 671 | m_inc(m, pkt_len + 2); |
| 672 | } |
| 673 | m->m_len = pkt_len + 2; |
| 674 | memcpy(m->m_data + 2, pkt, pkt_len); |
| 675 | |
| 676 | m->m_data += 2 + ETH_HLEN; |
| 677 | m->m_len -= 2 + ETH_HLEN; |
| 678 | |
| 679 | ip_input(m); |
| 680 | break; |
| 681 | default: |
| 682 | break; |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | /* output the IP packet to the ethernet device */ |
| 687 | void if_encap(const uint8_t *ip_data, int ip_data_len) |
| 688 | { |
| 689 | uint8_t buf[1600]; |
| 690 | struct ethhdr *eh = (struct ethhdr *)buf; |
| 691 | |
| 692 | if (ip_data_len + ETH_HLEN > sizeof(buf)) |
| 693 | return; |
| 694 | |
| 695 | if (!memcmp(client_ethaddr, zero_ethaddr, ETH_ALEN)) { |
| 696 | uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; |
| 697 | struct ethhdr *reh = (struct ethhdr *)arp_req; |
| 698 | struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN); |
| 699 | const struct ip *iph = (const struct ip *)ip_data; |
| 700 | |
| 701 | /* If the client addr is not known, there is no point in |
| 702 | sending the packet to it. Normally the sender should have |
| 703 | done an ARP request to get its MAC address. Here we do it |
| 704 | in place of sending the packet and we hope that the sender |
| 705 | will retry sending its packet. */ |
| 706 | memset(reh->h_dest, 0xff, ETH_ALEN); |
| 707 | memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1); |
| 708 | reh->h_source[5] = CTL_ALIAS; |
| 709 | reh->h_proto = htons(ETH_P_ARP); |
| 710 | rah->ar_hrd = htons(1); |
| 711 | rah->ar_pro = htons(ETH_P_IP); |
| 712 | rah->ar_hln = ETH_ALEN; |
| 713 | rah->ar_pln = 4; |
| 714 | rah->ar_op = htons(ARPOP_REQUEST); |
| 715 | /* source hw addr */ |
| 716 | memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 1); |
| 717 | rah->ar_sha[5] = CTL_ALIAS; |
| 718 | /* source IP */ |
| 719 | memcpy(rah->ar_sip, &alias_addr, 4); |
| 720 | /* target hw addr (none) */ |
| 721 | memset(rah->ar_tha, 0, ETH_ALEN); |
| 722 | /* target IP */ |
| 723 | memcpy(rah->ar_tip, &iph->ip_dst, 4); |
| 724 | client_ipaddr = iph->ip_dst; |
| 725 | slirp_output(arp_req, sizeof(arp_req)); |
| 726 | } else { |
| 727 | memcpy(eh->h_dest, client_ethaddr, ETH_ALEN); |
| 728 | memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1); |
| 729 | /* XXX: not correct */ |
| 730 | eh->h_source[5] = CTL_ALIAS; |
| 731 | eh->h_proto = htons(ETH_P_IP); |
| 732 | memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len); |
| 733 | slirp_output(buf, ip_data_len + ETH_HLEN); |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | static void _slirp_redir_loop(void (*func)(void *opaque, int is_udp, |
| 738 | struct in_addr *laddr, u_int lport, |
| 739 | struct in_addr *faddr, u_int fport), |
| 740 | void *opaque, int is_udp) |
| 741 | { |
| 742 | struct socket *head = (is_udp ? &udb : &tcb); |
| 743 | struct socket *so; |
| 744 | |
| 745 | for (so = head->so_next; so != head; so = so->so_next) { |
| 746 | func(opaque, is_udp, |
| 747 | &so->so_laddr, ntohs(so->so_lport), |
| 748 | &so->so_faddr, ntohs(so->so_fport)); |
| 749 | } |
| 750 | } |
| 751 | |
| 752 | void slirp_redir_loop(void (*func)(void *opaque, int is_udp, |
| 753 | struct in_addr *laddr, u_int lport, |
| 754 | struct in_addr *faddr, u_int fport), |
| 755 | void *opaque) |
| 756 | { |
| 757 | _slirp_redir_loop(func, opaque, 0); |
| 758 | _slirp_redir_loop(func, opaque, 1); |
| 759 | } |
| 760 | |
| 761 | /* Unlistens a redirection |
| 762 | * |
| 763 | * Return value: number of redirs removed */ |
| 764 | int slirp_redir_rm(int is_udp, int host_port) |
| 765 | { |
| 766 | struct socket *so; |
| 767 | struct socket *head = (is_udp ? &udb : &tcb); |
| 768 | int fport = htons(host_port); |
| 769 | int n = 0; |
| 770 | |
| 771 | loop_again: |
| 772 | for (so = head->so_next; so != head; so = so->so_next) { |
| 773 | if (so->so_fport == fport) { |
| 774 | close(so->s); |
| 775 | sofree(so); |
| 776 | n++; |
| 777 | goto loop_again; |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | return n; |
| 782 | } |
| 783 | |
| 784 | int slirp_redir(int is_udp, int host_port, |
| 785 | struct in_addr guest_addr, int guest_port) |
| 786 | { |
| 787 | if (is_udp) { |
| 788 | if (!udp_listen(htons(host_port), guest_addr.s_addr, |
| 789 | htons(guest_port), 0)) |
| 790 | return -1; |
| 791 | } else { |
| 792 | if (!solisten(htons(host_port), guest_addr.s_addr, |
| 793 | htons(guest_port), 0)) |
| 794 | return -1; |
| 795 | } |
| 796 | return 0; |
| 797 | } |
| 798 | |
| 799 | int slirp_add_exec(int do_pty, const void *args, int addr_low_byte, |
| 800 | int guest_port) |
| 801 | { |
| 802 | return add_exec(&exec_list, do_pty, (char *)args, |
| 803 | addr_low_byte, htons(guest_port)); |
| 804 | } |
| 805 | |
| 806 | ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) |
| 807 | { |
| 808 | if (so->s == -1 && so->extra) { |
| 809 | qemu_chr_write(so->extra, buf, len); |
| 810 | return len; |
| 811 | } |
| 812 | |
| 813 | return send(so->s, buf, len, flags); |
| 814 | } |
| 815 | |
| 816 | static struct socket *slirp_find_ctl_socket(int addr_low_byte, int guest_port) |
| 817 | { |
| 818 | struct socket *so; |
| 819 | |
| 820 | for (so = tcb.so_next; so != &tcb; so = so->so_next) { |
| 821 | if ((so->so_faddr.s_addr & htonl(0xffffff00)) == |
| 822 | special_addr.s_addr |
| 823 | && (ntohl(so->so_faddr.s_addr) & 0xff) == |
| 824 | addr_low_byte |
| 825 | && htons(so->so_fport) == guest_port) |
| 826 | return so; |
| 827 | } |
| 828 | |
| 829 | return NULL; |
| 830 | } |
| 831 | |
| 832 | size_t slirp_socket_can_recv(int addr_low_byte, int guest_port) |
| 833 | { |
| 834 | struct iovec iov[2]; |
| 835 | struct socket *so; |
| 836 | |
| 837 | if (!link_up) |
| 838 | return 0; |
| 839 | |
| 840 | so = slirp_find_ctl_socket(addr_low_byte, guest_port); |
| 841 | |
| 842 | if (!so || so->so_state & SS_NOFDREF) |
| 843 | return 0; |
| 844 | |
| 845 | if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) |
| 846 | return 0; |
| 847 | |
| 848 | return sopreprbuf(so, iov, NULL); |
| 849 | } |
| 850 | |
| 851 | void slirp_socket_recv(int addr_low_byte, int guest_port, const uint8_t *buf, |
| 852 | int size) |
| 853 | { |
| 854 | int ret; |
| 855 | struct socket *so = slirp_find_ctl_socket(addr_low_byte, guest_port); |
| 856 | |
| 857 | if (!so) |
| 858 | return; |
| 859 | |
| 860 | ret = soreadbuf(so, (const char *)buf, size); |
| 861 | |
| 862 | if (ret > 0) |
| 863 | tcp_output(sototcpcb(so)); |
| 864 | } |
| 865 | |
| 866 | static void slirp_tcp_save(QEMUFile *f, struct tcpcb *tp) |
| 867 | { |
| 868 | int i; |
| 869 | |
| 870 | qemu_put_sbe16(f, tp->t_state); |
| 871 | for (i = 0; i < TCPT_NTIMERS; i++) |
| 872 | qemu_put_sbe16(f, tp->t_timer[i]); |
| 873 | qemu_put_sbe16(f, tp->t_rxtshift); |
| 874 | qemu_put_sbe16(f, tp->t_rxtcur); |
| 875 | qemu_put_sbe16(f, tp->t_dupacks); |
| 876 | qemu_put_be16(f, tp->t_maxseg); |
| 877 | qemu_put_sbyte(f, tp->t_force); |
| 878 | qemu_put_be16(f, tp->t_flags); |
| 879 | qemu_put_be32(f, tp->snd_una); |
| 880 | qemu_put_be32(f, tp->snd_nxt); |
| 881 | qemu_put_be32(f, tp->snd_up); |
| 882 | qemu_put_be32(f, tp->snd_wl1); |
| 883 | qemu_put_be32(f, tp->snd_wl2); |
| 884 | qemu_put_be32(f, tp->iss); |
| 885 | qemu_put_be32(f, tp->snd_wnd); |
| 886 | qemu_put_be32(f, tp->rcv_wnd); |
| 887 | qemu_put_be32(f, tp->rcv_nxt); |
| 888 | qemu_put_be32(f, tp->rcv_up); |
| 889 | qemu_put_be32(f, tp->irs); |
| 890 | qemu_put_be32(f, tp->rcv_adv); |
| 891 | qemu_put_be32(f, tp->snd_max); |
| 892 | qemu_put_be32(f, tp->snd_cwnd); |
| 893 | qemu_put_be32(f, tp->snd_ssthresh); |
| 894 | qemu_put_sbe16(f, tp->t_idle); |
| 895 | qemu_put_sbe16(f, tp->t_rtt); |
| 896 | qemu_put_be32(f, tp->t_rtseq); |
| 897 | qemu_put_sbe16(f, tp->t_srtt); |
| 898 | qemu_put_sbe16(f, tp->t_rttvar); |
| 899 | qemu_put_be16(f, tp->t_rttmin); |
| 900 | qemu_put_be32(f, tp->max_sndwnd); |
| 901 | qemu_put_byte(f, tp->t_oobflags); |
| 902 | qemu_put_byte(f, tp->t_iobc); |
| 903 | qemu_put_sbe16(f, tp->t_softerror); |
| 904 | qemu_put_byte(f, tp->snd_scale); |
| 905 | qemu_put_byte(f, tp->rcv_scale); |
| 906 | qemu_put_byte(f, tp->request_r_scale); |
| 907 | qemu_put_byte(f, tp->requested_s_scale); |
| 908 | qemu_put_be32(f, tp->ts_recent); |
| 909 | qemu_put_be32(f, tp->ts_recent_age); |
| 910 | qemu_put_be32(f, tp->last_ack_sent); |
| 911 | } |
| 912 | |
| 913 | static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf) |
| 914 | { |
| 915 | uint32_t off; |
| 916 | |
| 917 | qemu_put_be32(f, sbuf->sb_cc); |
| 918 | qemu_put_be32(f, sbuf->sb_datalen); |
| 919 | off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data); |
| 920 | qemu_put_sbe32(f, off); |
| 921 | off = (uint32_t)(sbuf->sb_rptr - sbuf->sb_data); |
| 922 | qemu_put_sbe32(f, off); |
| 923 | qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
| 924 | } |
| 925 | |
| 926 | static void slirp_socket_save(QEMUFile *f, struct socket *so) |
| 927 | { |
| 928 | qemu_put_be32(f, so->so_urgc); |
| 929 | qemu_put_be32(f, so->so_faddr.s_addr); |
| 930 | qemu_put_be32(f, so->so_laddr.s_addr); |
| 931 | qemu_put_be16(f, so->so_fport); |
| 932 | qemu_put_be16(f, so->so_lport); |
| 933 | qemu_put_byte(f, so->so_iptos); |
| 934 | qemu_put_byte(f, so->so_emu); |
| 935 | qemu_put_byte(f, so->so_type); |
| 936 | qemu_put_be32(f, so->so_state); |
| 937 | slirp_sbuf_save(f, &so->so_rcv); |
| 938 | slirp_sbuf_save(f, &so->so_snd); |
| 939 | slirp_tcp_save(f, so->so_tcpcb); |
| 940 | } |
| 941 | |
| 942 | static void slirp_state_save(QEMUFile *f, void *opaque) |
| 943 | { |
| 944 | struct ex_list *ex_ptr; |
| 945 | |
| 946 | for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) |
| 947 | if (ex_ptr->ex_pty == 3) { |
| 948 | struct socket *so; |
| 949 | so = slirp_find_ctl_socket(ex_ptr->ex_addr, ntohs(ex_ptr->ex_fport)); |
| 950 | if (!so) |
| 951 | continue; |
| 952 | |
| 953 | qemu_put_byte(f, 42); |
| 954 | slirp_socket_save(f, so); |
| 955 | } |
| 956 | qemu_put_byte(f, 0); |
| 957 | } |
| 958 | |
| 959 | static void slirp_tcp_load(QEMUFile *f, struct tcpcb *tp) |
| 960 | { |
| 961 | int i; |
| 962 | |
| 963 | tp->t_state = qemu_get_sbe16(f); |
| 964 | for (i = 0; i < TCPT_NTIMERS; i++) |
| 965 | tp->t_timer[i] = qemu_get_sbe16(f); |
| 966 | tp->t_rxtshift = qemu_get_sbe16(f); |
| 967 | tp->t_rxtcur = qemu_get_sbe16(f); |
| 968 | tp->t_dupacks = qemu_get_sbe16(f); |
| 969 | tp->t_maxseg = qemu_get_be16(f); |
| 970 | tp->t_force = qemu_get_sbyte(f); |
| 971 | tp->t_flags = qemu_get_be16(f); |
| 972 | tp->snd_una = qemu_get_be32(f); |
| 973 | tp->snd_nxt = qemu_get_be32(f); |
| 974 | tp->snd_up = qemu_get_be32(f); |
| 975 | tp->snd_wl1 = qemu_get_be32(f); |
| 976 | tp->snd_wl2 = qemu_get_be32(f); |
| 977 | tp->iss = qemu_get_be32(f); |
| 978 | tp->snd_wnd = qemu_get_be32(f); |
| 979 | tp->rcv_wnd = qemu_get_be32(f); |
| 980 | tp->rcv_nxt = qemu_get_be32(f); |
| 981 | tp->rcv_up = qemu_get_be32(f); |
| 982 | tp->irs = qemu_get_be32(f); |
| 983 | tp->rcv_adv = qemu_get_be32(f); |
| 984 | tp->snd_max = qemu_get_be32(f); |
| 985 | tp->snd_cwnd = qemu_get_be32(f); |
| 986 | tp->snd_ssthresh = qemu_get_be32(f); |
| 987 | tp->t_idle = qemu_get_sbe16(f); |
| 988 | tp->t_rtt = qemu_get_sbe16(f); |
| 989 | tp->t_rtseq = qemu_get_be32(f); |
| 990 | tp->t_srtt = qemu_get_sbe16(f); |
| 991 | tp->t_rttvar = qemu_get_sbe16(f); |
| 992 | tp->t_rttmin = qemu_get_be16(f); |
| 993 | tp->max_sndwnd = qemu_get_be32(f); |
| 994 | tp->t_oobflags = qemu_get_byte(f); |
| 995 | tp->t_iobc = qemu_get_byte(f); |
| 996 | tp->t_softerror = qemu_get_sbe16(f); |
| 997 | tp->snd_scale = qemu_get_byte(f); |
| 998 | tp->rcv_scale = qemu_get_byte(f); |
| 999 | tp->request_r_scale = qemu_get_byte(f); |
| 1000 | tp->requested_s_scale = qemu_get_byte(f); |
| 1001 | tp->ts_recent = qemu_get_be32(f); |
| 1002 | tp->ts_recent_age = qemu_get_be32(f); |
| 1003 | tp->last_ack_sent = qemu_get_be32(f); |
| 1004 | tcp_template(tp); |
| 1005 | } |
| 1006 | |
| 1007 | static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf) |
| 1008 | { |
| 1009 | uint32_t off, sb_cc, sb_datalen; |
| 1010 | |
| 1011 | sb_cc = qemu_get_be32(f); |
| 1012 | sb_datalen = qemu_get_be32(f); |
| 1013 | |
| 1014 | sbreserve(sbuf, sb_datalen); |
| 1015 | |
| 1016 | if (sbuf->sb_datalen != sb_datalen) |
| 1017 | return -ENOMEM; |
| 1018 | |
| 1019 | sbuf->sb_cc = sb_cc; |
| 1020 | |
| 1021 | off = qemu_get_sbe32(f); |
| 1022 | sbuf->sb_wptr = sbuf->sb_data + off; |
| 1023 | off = qemu_get_sbe32(f); |
| 1024 | sbuf->sb_rptr = sbuf->sb_data + off; |
| 1025 | qemu_get_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
| 1026 | |
| 1027 | return 0; |
| 1028 | } |
| 1029 | |
| 1030 | static int slirp_socket_load(QEMUFile *f, struct socket *so) |
| 1031 | { |
| 1032 | if (tcp_attach(so) < 0) |
| 1033 | return -ENOMEM; |
| 1034 | |
| 1035 | so->so_urgc = qemu_get_be32(f); |
| 1036 | so->so_faddr.s_addr = qemu_get_be32(f); |
| 1037 | so->so_laddr.s_addr = qemu_get_be32(f); |
| 1038 | so->so_fport = qemu_get_be16(f); |
| 1039 | so->so_lport = qemu_get_be16(f); |
| 1040 | so->so_iptos = qemu_get_byte(f); |
| 1041 | so->so_emu = qemu_get_byte(f); |
| 1042 | so->so_type = qemu_get_byte(f); |
| 1043 | so->so_state = qemu_get_be32(f); |
| 1044 | if (slirp_sbuf_load(f, &so->so_rcv) < 0) |
| 1045 | return -ENOMEM; |
| 1046 | if (slirp_sbuf_load(f, &so->so_snd) < 0) |
| 1047 | return -ENOMEM; |
| 1048 | slirp_tcp_load(f, so->so_tcpcb); |
| 1049 | |
| 1050 | return 0; |
| 1051 | } |
| 1052 | |
| 1053 | static int slirp_state_load(QEMUFile *f, void *opaque, int version_id) |
| 1054 | { |
| 1055 | struct ex_list *ex_ptr; |
| 1056 | int r; |
| 1057 | |
| 1058 | while ((r = qemu_get_byte(f))) { |
| 1059 | int ret; |
| 1060 | struct socket *so = socreate(); |
| 1061 | |
| 1062 | if (!so) |
| 1063 | return -ENOMEM; |
| 1064 | |
| 1065 | ret = slirp_socket_load(f, so); |
| 1066 | |
| 1067 | if (ret < 0) |
| 1068 | return ret; |
| 1069 | |
| 1070 | if ((so->so_faddr.s_addr & htonl(0xffffff00)) != special_addr.s_addr) |
| 1071 | return -EINVAL; |
| 1072 | |
| 1073 | for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) |
| 1074 | if (ex_ptr->ex_pty == 3 && |
| 1075 | (ntohl(so->so_faddr.s_addr) & 0xff) == ex_ptr->ex_addr && |
| 1076 | so->so_fport == ex_ptr->ex_fport) |
| 1077 | break; |
| 1078 | |
| 1079 | if (!ex_ptr) |
| 1080 | return -EINVAL; |
| 1081 | |
| 1082 | so->extra = (void *)ex_ptr->ex_exec; |
| 1083 | } |
| 1084 | |
| 1085 | return 0; |
| 1086 | } |