net/slirp.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 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 "net/slirp.h"
  25
  26 #include "config-host.h"
  27
  28 #ifndef _WIN32
  29 #include <pwd.h>
  30 #include <sys/wait.h>
  31 #endif
  32 #include "net.h"
  33 #include "net/hub.h"
  34 #include "monitor.h"
  35 #include "qemu_socket.h"
  36 #include "slirp/libslirp.h"
  37
  38 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  39 {
  40     const char *p, *p1;
  41     int len;
  42     p = *pp;
  43     p1 = strchr(p, sep);
  44     if (!p1)
  45         return -1;
  46     len = p1 - p;
  47     p1++;
  48     if (buf_size > 0) {
  49         if (len > buf_size - 1)
  50             len = buf_size - 1;
  51         memcpy(buf, p, len);
  52         buf[len] = '\0';
  53     }
  54     *pp = p1;
  55     return 0;
  56 }
  57
  58 /* slirp network adapter */
  59
  60 #define SLIRP_CFG_HOSTFWD 1
  61 #define SLIRP_CFG_LEGACY  2
  62
  63 struct slirp_config_str {
  64     struct slirp_config_str *next;
  65     int flags;
  66     char str[1024];
  67     int legacy_format;
  68 };
  69
  70 typedef struct SlirpState {
  71     VLANClientState nc;
  72     QTAILQ_ENTRY(SlirpState) entry;
  73     Slirp *slirp;
  74 #ifndef _WIN32
  75     char smb_dir[128];
  76 #endif
  77 } SlirpState;
  78
  79 static struct slirp_config_str *slirp_configs;
  80 const char *legacy_tftp_prefix;
  81 const char *legacy_bootp_filename;
  82 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
  83     QTAILQ_HEAD_INITIALIZER(slirp_stacks);
  84
  85 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
  86                          int legacy_format);
  87 static int slirp_guestfwd(SlirpState *s, const char *config_str,
  88                           int legacy_format);
  89
  90 #ifndef _WIN32
  91 static const char *legacy_smb_export;
  92
  93 static int slirp_smb(SlirpState *s, const char *exported_dir,
  94                      struct in_addr vserver_addr);
  95 static void slirp_smb_cleanup(SlirpState *s);
  96 #else
  97 static inline void slirp_smb_cleanup(SlirpState *s) { }
  98 #endif
  99
 100 int slirp_can_output(void *opaque)
 101 {
 102     SlirpState *s = opaque;
 103
 104     return qemu_can_send_packet(&s->nc);
 105 }
 106
 107 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
 108 {
 109     SlirpState *s = opaque;
 110
 111     qemu_send_packet(&s->nc, pkt, pkt_len);
 112 }
 113
 114 static ssize_t net_slirp_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
 115 {
 116     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 117
 118     slirp_input(s->slirp, buf, size);
 119
 120     return size;
 121 }
 122
 123 static void net_slirp_cleanup(VLANClientState *nc)
 124 {
 125     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 126
 127     slirp_cleanup(s->slirp);
 128     slirp_smb_cleanup(s);
 129     QTAILQ_REMOVE(&slirp_stacks, s, entry);
 130 }
 131
 132 static NetClientInfo net_slirp_info = {
 133     .type = NET_CLIENT_OPTIONS_KIND_USER,
 134     .size = sizeof(SlirpState),
 135     .receive = net_slirp_receive,
 136     .cleanup = net_slirp_cleanup,
 137 };
 138
 139 static int net_slirp_init(VLANClientState *peer, const char *model,
 140                           const char *name, int restricted,
 141                           const char *vnetwork, const char *vhost,
 142                           const char *vhostname, const char *tftp_export,
 143                           const char *bootfile, const char *vdhcp_start,
 144                           const char *vnameserver, const char *smb_export,
 145                           const char *vsmbserver)
 146 {
 147     /* default settings according to historic slirp */
 148     struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
 149     struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
 150     struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
 151     struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
 152     struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
 153 #ifndef _WIN32
 154     struct in_addr smbsrv = { .s_addr = 0 };
 155 #endif
 156     VLANClientState *nc;
 157     SlirpState *s;
 158     char buf[20];
 159     uint32_t addr;
 160     int shift;
 161     char *end;
 162     struct slirp_config_str *config;
 163
 164     if (!tftp_export) {
 165         tftp_export = legacy_tftp_prefix;
 166     }
 167     if (!bootfile) {
 168         bootfile = legacy_bootp_filename;
 169     }
 170
 171     if (vnetwork) {
 172         if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
 173             if (!inet_aton(vnetwork, &net)) {
 174                 return -1;
 175             }
 176             addr = ntohl(net.s_addr);
 177             if (!(addr & 0x80000000)) {
 178                 mask.s_addr = htonl(0xff000000); /* class A */
 179             } else if ((addr & 0xfff00000) == 0xac100000) {
 180                 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
 181             } else if ((addr & 0xc0000000) == 0x80000000) {
 182                 mask.s_addr = htonl(0xffff0000); /* class B */
 183             } else if ((addr & 0xffff0000) == 0xc0a80000) {
 184                 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
 185             } else if ((addr & 0xffff0000) == 0xc6120000) {
 186                 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
 187             } else if ((addr & 0xe0000000) == 0xe0000000) {
 188                 mask.s_addr = htonl(0xffffff00); /* class C */
 189             } else {
 190                 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
 191             }
 192         } else {
 193             if (!inet_aton(buf, &net)) {
 194                 return -1;
 195             }
 196             shift = strtol(vnetwork, &end, 10);
 197             if (*end != '\0') {
 198                 if (!inet_aton(vnetwork, &mask)) {
 199                     return -1;
 200                 }
 201             } else if (shift < 4 || shift > 32) {
 202                 return -1;
 203             } else {
 204                 mask.s_addr = htonl(0xffffffff << (32 - shift));
 205             }
 206         }
 207         net.s_addr &= mask.s_addr;
 208         host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
 209         dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
 210         dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
 211     }
 212
 213     if (vhost && !inet_aton(vhost, &host)) {
 214         return -1;
 215     }
 216     if ((host.s_addr & mask.s_addr) != net.s_addr) {
 217         return -1;
 218     }
 219
 220     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
 221         return -1;
 222     }
 223     if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
 224         dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
 225         return -1;
 226     }
 227
 228     if (vnameserver && !inet_aton(vnameserver, &dns)) {
 229         return -1;
 230     }
 231     if ((dns.s_addr & mask.s_addr) != net.s_addr ||
 232         dns.s_addr == host.s_addr) {
 233         return -1;
 234     }
 235
 236 #ifndef _WIN32
 237     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
 238         return -1;
 239     }
 240 #endif
 241
 242     nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
 243
 244     snprintf(nc->info_str, sizeof(nc->info_str),
 245              "net=%s,restrict=%s", inet_ntoa(net),
 246              restricted ? "on" : "off");
 247
 248     s = DO_UPCAST(SlirpState, nc, nc);
 249
 250     s->slirp = slirp_init(restricted, net, mask, host, vhostname,
 251                           tftp_export, bootfile, dhcp, dns, s);
 252     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 253
 254     for (config = slirp_configs; config; config = config->next) {
 255         if (config->flags & SLIRP_CFG_HOSTFWD) {
 256             if (slirp_hostfwd(s, config->str,
 257                               config->flags & SLIRP_CFG_LEGACY) < 0)
 258                 goto error;
 259         } else {
 260             if (slirp_guestfwd(s, config->str,
 261                                config->flags & SLIRP_CFG_LEGACY) < 0)
 262                 goto error;
 263         }
 264     }
 265 #ifndef _WIN32
 266     if (!smb_export) {
 267         smb_export = legacy_smb_export;
 268     }
 269     if (smb_export) {
 270         if (slirp_smb(s, smb_export, smbsrv) < 0)
 271             goto error;
 272     }
 273 #endif
 274
 275     return 0;
 276
 277 error:
 278     qemu_del_vlan_client(nc);
 279     return -1;
 280 }
 281
 282 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
 283                                 const char *stack)
 284 {
 285
 286     if (vlan) {
 287         VLANClientState *nc;
 288         nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack);
 289         if (!nc) {
 290             return NULL;
 291         }
 292         if (strcmp(nc->model, "user")) {
 293             monitor_printf(mon, "invalid device specified\n");
 294             return NULL;
 295         }
 296         return DO_UPCAST(SlirpState, nc, nc);
 297     } else {
 298         if (QTAILQ_EMPTY(&slirp_stacks)) {
 299             monitor_printf(mon, "user mode network stack not in use\n");
 300             return NULL;
 301         }
 302         return QTAILQ_FIRST(&slirp_stacks);
 303     }
 304 }
 305
 306 void net_slirp_hostfwd_remove(Monitor *mon, const QDict *qdict)
 307 {
 308     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 309     int host_port;
 310     char buf[256];
 311     const char *src_str, *p;
 312     SlirpState *s;
 313     int is_udp = 0;
 314     int err;
 315     const char *arg1 = qdict_get_str(qdict, "arg1");
 316     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 317     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 318
 319     if (arg2) {
 320         s = slirp_lookup(mon, arg1, arg2);
 321         src_str = arg3;
 322     } else {
 323         s = slirp_lookup(mon, NULL, NULL);
 324         src_str = arg1;
 325     }
 326     if (!s) {
 327         return;
 328     }
 329
 330     p = src_str;
 331     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 332         goto fail_syntax;
 333     }
 334
 335     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 336         is_udp = 0;
 337     } else if (!strcmp(buf, "udp")) {
 338         is_udp = 1;
 339     } else {
 340         goto fail_syntax;
 341     }
 342
 343     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 344         goto fail_syntax;
 345     }
 346     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 347         goto fail_syntax;
 348     }
 349
 350     host_port = atoi(p);
 351
 352     err = slirp_remove_hostfwd(QTAILQ_FIRST(&slirp_stacks)->slirp, is_udp,
 353                                host_addr, host_port);
 354
 355     monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
 356                    err ? "not found" : "removed");
 357     return;
 358
 359  fail_syntax:
 360     monitor_printf(mon, "invalid format\n");
 361 }
 362
 363 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
 364                          int legacy_format)
 365 {
 366     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 367     struct in_addr guest_addr = { .s_addr = 0 };
 368     int host_port, guest_port;
 369     const char *p;
 370     char buf[256];
 371     int is_udp;
 372     char *end;
 373
 374     p = redir_str;
 375     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 376         goto fail_syntax;
 377     }
 378     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 379         is_udp = 0;
 380     } else if (!strcmp(buf, "udp")) {
 381         is_udp = 1;
 382     } else {
 383         goto fail_syntax;
 384     }
 385
 386     if (!legacy_format) {
 387         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 388             goto fail_syntax;
 389         }
 390         if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 391             goto fail_syntax;
 392         }
 393     }
 394
 395     if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
 396         goto fail_syntax;
 397     }
 398     host_port = strtol(buf, &end, 0);
 399     if (*end != '\0' || host_port < 1 || host_port > 65535) {
 400         goto fail_syntax;
 401     }
 402
 403     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 404         goto fail_syntax;
 405     }
 406     if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
 407         goto fail_syntax;
 408     }
 409
 410     guest_port = strtol(p, &end, 0);
 411     if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
 412         goto fail_syntax;
 413     }
 414
 415     if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
 416                           guest_port) < 0) {
 417         error_report("could not set up host forwarding rule '%s'",
 418                      redir_str);
 419         return -1;
 420     }
 421     return 0;
 422
 423  fail_syntax:
 424     error_report("invalid host forwarding rule '%s'", redir_str);
 425     return -1;
 426 }
 427
 428 void net_slirp_hostfwd_add(Monitor *mon, const QDict *qdict)
 429 {
 430     const char *redir_str;
 431     SlirpState *s;
 432     const char *arg1 = qdict_get_str(qdict, "arg1");
 433     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 434     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 435
 436     if (arg2) {
 437         s = slirp_lookup(mon, arg1, arg2);
 438         redir_str = arg3;
 439     } else {
 440         s = slirp_lookup(mon, NULL, NULL);
 441         redir_str = arg1;
 442     }
 443     if (s) {
 444         slirp_hostfwd(s, redir_str, 0);
 445     }
 446
 447 }
 448
 449 int net_slirp_redir(const char *redir_str)
 450 {
 451     struct slirp_config_str *config;
 452
 453     if (QTAILQ_EMPTY(&slirp_stacks)) {
 454         config = g_malloc(sizeof(*config));
 455         pstrcpy(config->str, sizeof(config->str), redir_str);
 456         config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
 457         config->next = slirp_configs;
 458         slirp_configs = config;
 459         return 0;
 460     }
 461
 462     return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
 463 }
 464
 465 #ifndef _WIN32
 466
 467 /* automatic user mode samba server configuration */
 468 static void slirp_smb_cleanup(SlirpState *s)
 469 {
 470     char cmd[128];
 471     int ret;
 472
 473     if (s->smb_dir[0] != '\0') {
 474         snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
 475         ret = system(cmd);
 476         if (ret == -1 || !WIFEXITED(ret)) {
 477             error_report("'%s' failed.", cmd);
 478         } else if (WEXITSTATUS(ret)) {
 479             error_report("'%s' failed. Error code: %d",
 480                          cmd, WEXITSTATUS(ret));
 481         }
 482         s->smb_dir[0] = '\0';
 483     }
 484 }
 485
 486 static int slirp_smb(SlirpState* s, const char *exported_dir,
 487                      struct in_addr vserver_addr)
 488 {
 489     static int instance;
 490     char smb_conf[128];
 491     char smb_cmdline[128];
 492     struct passwd *passwd;
 493     FILE *f;
 494
 495     passwd = getpwuid(geteuid());
 496     if (!passwd) {
 497         error_report("failed to retrieve user name");
 498         return -1;
 499     }
 500
 501     if (access(CONFIG_SMBD_COMMAND, F_OK)) {
 502         error_report("could not find '%s', please install it",
 503                      CONFIG_SMBD_COMMAND);
 504         return -1;
 505     }
 506
 507     if (access(exported_dir, R_OK | X_OK)) {
 508         error_report("error accessing shared directory '%s': %s",
 509                      exported_dir, strerror(errno));
 510         return -1;
 511     }
 512
 513     snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d",
 514              (long)getpid(), instance++);
 515     if (mkdir(s->smb_dir, 0700) < 0) {
 516         error_report("could not create samba server dir '%s'", s->smb_dir);
 517         return -1;
 518     }
 519     snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");
 520
 521     f = fopen(smb_conf, "w");
 522     if (!f) {
 523         slirp_smb_cleanup(s);
 524         error_report("could not create samba server configuration file '%s'",
 525                      smb_conf);
 526         return -1;
 527     }
 528     fprintf(f,
 529             "[global]\n"
 530             "private dir=%s\n"
 531             "socket address=127.0.0.1\n"
 532             "pid directory=%s\n"
 533             "lock directory=%s\n"
 534             "state directory=%s\n"
 535             "log file=%s/log.smbd\n"
 536             "smb passwd file=%s/smbpasswd\n"
 537             "security = share\n"
 538             "[qemu]\n"
 539             "path=%s\n"
 540             "read only=no\n"
 541             "guest ok=yes\n"
 542             "force user=%s\n",
 543             s->smb_dir,
 544             s->smb_dir,
 545             s->smb_dir,
 546             s->smb_dir,
 547             s->smb_dir,
 548             s->smb_dir,
 549             exported_dir,
 550             passwd->pw_name
 551             );
 552     fclose(f);
 553
 554     snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s",
 555              CONFIG_SMBD_COMMAND, smb_conf);
 556
 557     if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0) {
 558         slirp_smb_cleanup(s);
 559         error_report("conflicting/invalid smbserver address");
 560         return -1;
 561     }
 562     return 0;
 563 }
 564
 565 /* automatic user mode samba server configuration (legacy interface) */
 566 int net_slirp_smb(const char *exported_dir)
 567 {
 568     struct in_addr vserver_addr = { .s_addr = 0 };
 569
 570     if (legacy_smb_export) {
 571         fprintf(stderr, "-smb given twice\n");
 572         return -1;
 573     }
 574     legacy_smb_export = exported_dir;
 575     if (!QTAILQ_EMPTY(&slirp_stacks)) {
 576         return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
 577                          vserver_addr);
 578     }
 579     return 0;
 580 }
 581
 582 #endif /* !defined(_WIN32) */
 583
 584 struct GuestFwd {
 585     CharDriverState *hd;
 586     struct in_addr server;
 587     int port;
 588     Slirp *slirp;
 589 };
 590
 591 static int guestfwd_can_read(void *opaque)
 592 {
 593     struct GuestFwd *fwd = opaque;
 594     return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
 595 }
 596
 597 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
 598 {
 599     struct GuestFwd *fwd = opaque;
 600     slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
 601 }
 602
 603 static int slirp_guestfwd(SlirpState *s, const char *config_str,
 604                           int legacy_format)
 605 {
 606     struct in_addr server = { .s_addr = 0 };
 607     struct GuestFwd *fwd;
 608     const char *p;
 609     char buf[128];
 610     char *end;
 611     int port;
 612
 613     p = config_str;
 614     if (legacy_format) {
 615         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 616             goto fail_syntax;
 617         }
 618     } else {
 619         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 620             goto fail_syntax;
 621         }
 622         if (strcmp(buf, "tcp") && buf[0] != '\0') {
 623             goto fail_syntax;
 624         }
 625         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 626             goto fail_syntax;
 627         }
 628         if (buf[0] != '\0' && !inet_aton(buf, &server)) {
 629             goto fail_syntax;
 630         }
 631         if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 632             goto fail_syntax;
 633         }
 634     }
 635     port = strtol(buf, &end, 10);
 636     if (*end != '\0' || port < 1 || port > 65535) {
 637         goto fail_syntax;
 638     }
 639
 640     fwd = g_malloc(sizeof(struct GuestFwd));
 641     snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
 642
 643     if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
 644         if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
 645             error_report("conflicting/invalid host:port in guest forwarding "
 646                          "rule '%s'", config_str);
 647             g_free(fwd);
 648             return -1;
 649         }
 650     } else {
 651         fwd->hd = qemu_chr_new(buf, p, NULL);
 652         if (!fwd->hd) {
 653             error_report("could not open guest forwarding device '%s'", buf);
 654             g_free(fwd);
 655             return -1;
 656         }
 657
 658         if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) {
 659             error_report("conflicting/invalid host:port in guest forwarding "
 660                          "rule '%s'", config_str);
 661             g_free(fwd);
 662             return -1;
 663         }
 664         fwd->server = server;
 665         fwd->port = port;
 666         fwd->slirp = s->slirp;
 667
 668         qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read,
 669                               NULL, fwd);
 670     }
 671     return 0;
 672
 673  fail_syntax:
 674     error_report("invalid guest forwarding rule '%s'", config_str);
 675     return -1;
 676 }
 677
 678 void do_info_usernet(Monitor *mon)
 679 {
 680     SlirpState *s;
 681
 682     QTAILQ_FOREACH(s, &slirp_stacks, entry) {
 683         int id;
 684         bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0;
 685         monitor_printf(mon, "VLAN %d (%s):\n",
 686                        got_vlan_id ? id : -1,
 687                        s->nc.name);
 688         slirp_connection_info(s->slirp, mon);
 689     }
 690 }
 691
 692 static void
 693 net_init_slirp_configs(const StringList *fwd, int flags)
 694 {
 695     while (fwd) {
 696         struct slirp_config_str *config;
 697
 698         config = g_malloc0(sizeof(*config));
 699         pstrcpy(config->str, sizeof(config->str), fwd->value->str);
 700         config->flags = flags;
 701         config->next = slirp_configs;
 702         slirp_configs = config;
 703
 704         fwd = fwd->next;
 705     }
 706 }
 707
 708 int net_init_slirp(const NetClientOptions *opts, const char *name,
 709                    VLANClientState *peer)
 710 {
 711     struct slirp_config_str *config;
 712     char *vnet;
 713     int ret;
 714     const NetdevUserOptions *user;
 715
 716     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_USER);
 717     user = opts->user;
 718
 719     vnet = user->has_net ? g_strdup(user->net) :
 720            user->has_ip  ? g_strdup_printf("%s/24", user->ip) :
 721            NULL;
 722
 723     /* all optional fields are initialized to "all bits zero" */
 724
 725     net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
 726     net_init_slirp_configs(user->guestfwd, 0);
 727
 728     ret = net_slirp_init(peer, "user", name, user->restrict, vnet, user->host,
 729                          user->hostname, user->tftp, user->bootfile,
 730                          user->dhcpstart, user->dns, user->smb,
 731                          user->smbserver);
 732
 733     while (slirp_configs) {
 734         config = slirp_configs;
 735         slirp_configs = config->next;
 736         g_free(config);
 737     }
 738
 739     g_free(vnet);
 740
 741     return ret;
 742 }
 743
 744 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
 745 {
 746     if (strcmp(opts_list->name, "net") != 0 ||
 747         strncmp(optarg, "channel,", strlen("channel,")) != 0) {
 748         return 0;
 749     }
 750
 751     /* handle legacy -net channel,port:chr */
 752     optarg += strlen("channel,");
 753
 754     if (QTAILQ_EMPTY(&slirp_stacks)) {
 755         struct slirp_config_str *config;
 756
 757         config = g_malloc(sizeof(*config));
 758         pstrcpy(config->str, sizeof(config->str), optarg);
 759         config->flags = SLIRP_CFG_LEGACY;
 760         config->next = slirp_configs;
 761         slirp_configs = config;
 762         *ret = 0;
 763     } else {
 764         *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
 765     }
 766
 767     return 1;
 768 }
 769