uml_conf.c 14.4 KB
Newer Older
1 2 3
/*
 * uml_conf.c: UML driver configuration
 *
4
 * Copyright (C) 2006-2012 Red Hat, Inc.
5 6 7 8 9 10 11 12 13 14 15 16 17
 * Copyright (C) 2006 Daniel P. Berrange
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with this library.  If not, see
O
Osier Yang 已提交
19
 * <http://www.gnu.org/licenses/>.
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
 *
 * Author: Daniel P. Berrange <berrange@redhat.com>
 */

#include <config.h>

#include <string.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <arpa/inet.h>

#include "uml_conf.h"
38
#include "viruuid.h"
39
#include "virbuffer.h"
40
#include "virconf.h"
41
#include "virutil.h"
42
#include "viralloc.h"
43
#include "nodeinfo.h"
44
#include "virlog.h"
45
#include "domain_nwfilter.h"
E
Eric Blake 已提交
46
#include "virfile.h"
47
#include "vircommand.h"
48
#include "virnetdevtap.h"
49 50
#include "virnodesuspend.h"

51

52
#define VIR_FROM_THIS VIR_FROM_UML
53

54

55
static int umlDefaultConsoleType(const char *ostype ATTRIBUTE_UNUSED,
56
                                 virArch arch ATTRIBUTE_UNUSED)
57 58 59 60 61
{
    return VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_UML;
}


62 63 64 65
virCapsPtr umlCapsInit(void) {
    virCapsPtr caps;
    virCapsGuestPtr guest;

66
    if ((caps = virCapabilitiesNew(virArchFromHost(),
67
                                   0, 0)) == NULL)
68
        goto error;
69

70 71 72 73 74 75
    /* Some machines have problematic NUMA toplogy causing
     * unexpected failures. We don't want to break the QEMU
     * driver in this scenario, so log errors & carry on
     */
    if (nodeCapsInitNUMA(caps) < 0) {
        virCapabilitiesFreeNUMAInfo(caps);
76
        VIR_WARN("Failed to query host NUMA topology, disabling NUMA capabilities");
77
    }
78

79 80 81
    if (virNodeSuspendGetTargetMask(&caps->host.powerMgmt) < 0)
        VIR_WARN("Failed to get host power management capabilities");

82
    if (virGetHostUUID(caps->host.host_uuid)) {
83
        virReportError(VIR_ERR_INTERNAL_ERROR,
84 85 86 87
                       "%s", _("cannot get the host uuid"));
        goto error;
    }

88 89
    if ((guest = virCapabilitiesAddGuest(caps,
                                         "uml",
90
                                         caps->host.arch,
91 92 93 94
                                         NULL,
                                         NULL,
                                         0,
                                         NULL)) == NULL)
95
        goto error;
96 97 98 99 100 101 102

    if (virCapabilitiesAddGuestDomain(guest,
                                      "uml",
                                      NULL,
                                      NULL,
                                      0,
                                      NULL) == NULL)
103
        goto error;
104

105
    caps->defaultConsoleTargetType = umlDefaultConsoleType;
106

107 108
    return caps;

109
 error:
110 111 112 113 114
    virCapabilitiesFree(caps);
    return NULL;
}


115
static int
116
umlConnectTapDevice(virConnectPtr conn,
117
                    virDomainDefPtr vm,
118
                    virDomainNetDefPtr net,
119 120
                    const char *bridge)
{
E
Eric Blake 已提交
121
    bool template_ifname = false;
122

123
    if (!net->ifname ||
E
Eric Blake 已提交
124
        STRPREFIX(net->ifname, VIR_NET_GENERATED_PREFIX) ||
125 126
        strchr(net->ifname, '%')) {
        VIR_FREE(net->ifname);
E
Eric Blake 已提交
127
        if (!(net->ifname = strdup(VIR_NET_GENERATED_PREFIX "%d")))
128
            goto no_memory;
129
        /* avoid exposing vnet%d in getXMLDesc or error outputs */
E
Eric Blake 已提交
130
        template_ifname = true;
131 132
    }

133
    if (virNetDevTapCreateInBridgePort(bridge, &net->ifname, &net->mac,
134
                                       vm->uuid, NULL,
135
                                       virDomainNetGetActualVirtPortProfile(net),
136
                                       virDomainNetGetActualVlan(net),
137 138
                                       VIR_NETDEV_TAP_CREATE_IFUP |
                                       VIR_NETDEV_TAP_CREATE_PERSIST) < 0) {
139 140
        if (template_ifname)
            VIR_FREE(net->ifname);
141 142 143
        goto error;
    }

144
    if (net->filter) {
145
        if (virDomainConfNWFilterInstantiate(conn, vm->uuid, net) < 0) {
146 147 148 149 150 151
            if (template_ifname)
                VIR_FREE(net->ifname);
            goto error;
        }
    }

152 153 154
    return 0;

no_memory:
155
    virReportOOMError();
156 157 158 159 160 161
error:
    return -1;
}

static char *
umlBuildCommandLineNet(virConnectPtr conn,
162
                       virDomainDefPtr vm,
163 164 165 166 167 168 169
                       virDomainNetDefPtr def,
                       int idx)
{
    virBuffer buf = VIR_BUFFER_INITIALIZER;

    /* General format:  ethNN=type,options */

170
    virBufferAsprintf(&buf, "eth%d=", idx);
171 172 173 174 175 176 177 178 179

    switch (def->type) {
    case VIR_DOMAIN_NET_TYPE_USER:
        /* ethNNN=slirp,macaddr */
        virBufferAddLit(&buf, "slirp");
        break;

    case VIR_DOMAIN_NET_TYPE_ETHERNET:
        /* ethNNN=tuntap,tapname,macaddr,gateway */
180 181 182 183
        virBufferAddLit(&buf, "tuntap,");
        if (def->ifname) {
            virBufferAdd(&buf, def->ifname, -1);
        }
184
        if (def->data.ethernet.ipaddr) {
185
            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
E
Eric Blake 已提交
186
                           _("IP address not supported for ethernet interface"));
187 188 189 190 191
            goto error;
        }
        break;

    case VIR_DOMAIN_NET_TYPE_SERVER:
192
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
193 194 195 196
                       _("TCP server networking type not supported"));
        goto error;

    case VIR_DOMAIN_NET_TYPE_CLIENT:
197
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
198 199 200 201 202 203 204 205 206 207 208 209 210 211
                       _("TCP client networking type not supported"));
        goto error;

    case VIR_DOMAIN_NET_TYPE_MCAST:
        /* ethNNN=tuntap,macaddr,ipaddr,port */
        virBufferAddLit(&buf, "mcast");
        break;

    case VIR_DOMAIN_NET_TYPE_NETWORK:
    {
        char *bridge;
        virNetworkPtr network = virNetworkLookupByName(conn,
                                                       def->data.network.name);
        if (!network) {
212
            virReportError(VIR_ERR_INTERNAL_ERROR,
213 214 215 216 217 218 219 220 221 222
                           _("Network '%s' not found"),
                           def->data.network.name);
            goto error;
        }
        bridge = virNetworkGetBridgeName(network);
        virNetworkFree(network);
        if (bridge == NULL) {
            goto error;
        }

223
        if (umlConnectTapDevice(conn, vm, def, bridge) < 0) {
224 225 226 227 228
            VIR_FREE(bridge);
            goto error;
        }

        /* ethNNN=tuntap,tapname,macaddr,gateway */
229
        virBufferAsprintf(&buf, "tuntap,%s", def->ifname);
230 231 232 233
        break;
    }

    case VIR_DOMAIN_NET_TYPE_BRIDGE:
234 235
        if (umlConnectTapDevice(conn, vm, def,
                                def->data.bridge.brname) < 0)
236 237 238
            goto error;

        /* ethNNN=tuntap,tapname,macaddr,gateway */
239
        virBufferAsprintf(&buf, "tuntap,%s", def->ifname);
240 241 242
        break;

    case VIR_DOMAIN_NET_TYPE_INTERNAL:
243
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
244 245
                       _("internal networking type not supported"));
        goto error;
S
Stefan Berger 已提交
246 247

    case VIR_DOMAIN_NET_TYPE_DIRECT:
248
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
S
Stefan Berger 已提交
249 250 251
                       _("direct networking type not supported"));
        goto error;

252
    case VIR_DOMAIN_NET_TYPE_HOSTDEV:
253
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
254 255 256
                       _("hostdev networking type not supported"));
        goto error;

S
Stefan Berger 已提交
257 258
    case VIR_DOMAIN_NET_TYPE_LAST:
        break;
259 260
    }

261
    if (def->script) {
262
        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
263 264 265 266
                       _("interface script execution not supported by this driver"));
        goto error;
    }

267
    virBufferAsprintf(&buf, ",%02x:%02x:%02x:%02x:%02x:%02x",
268 269
                      def->mac.addr[0], def->mac.addr[1], def->mac.addr[2],
                      def->mac.addr[3], def->mac.addr[4], def->mac.addr[5]);
270 271

    if (def->type == VIR_DOMAIN_NET_TYPE_MCAST) {
272
        virBufferAsprintf(&buf, ",%s,%d",
273 274 275 276 277
                          def->data.socket.address,
                          def->data.socket.port);
    }

    if (virBufferError(&buf)) {
278
        virReportOOMError();
279 280 281 282 283 284
        return NULL;
    }

    return virBufferContentAndReset(&buf);

error:
285
    virBufferFreeAndReset(&buf);
286 287 288
    return NULL;
}

289
static char *
290
umlBuildCommandLineChr(virDomainChrDefPtr def,
291
                       const char *dev,
D
Daniel P. Berrange 已提交
292
                       virCommandPtr cmd)
293
{
294
    char *ret = NULL;
295

296
    switch (def->source.type) {
297
    case VIR_DOMAIN_CHR_TYPE_NULL:
298
        if (virAsprintf(&ret, "%s%d=null", dev, def->target.port) < 0) {
299
            virReportOOMError();
300 301 302 303 304
            return NULL;
        }
        break;

    case VIR_DOMAIN_CHR_TYPE_PTY:
305
        if (virAsprintf(&ret, "%s%d=pts", dev, def->target.port) < 0) {
306
            virReportOOMError();
307 308 309 310 311
            return NULL;
        }
        break;

    case VIR_DOMAIN_CHR_TYPE_DEV:
312
        if (virAsprintf(&ret, "%s%d=tty:%s", dev, def->target.port,
313
                        def->source.data.file.path) < 0) {
314
            virReportOOMError();
315 316 317 318 319
            return NULL;
        }
        break;

    case VIR_DOMAIN_CHR_TYPE_STDIO:
320
        if (virAsprintf(&ret, "%s%d=fd:0,fd:1", dev, def->target.port) < 0) {
321
            virReportOOMError();
322 323 324 325 326
            return NULL;
        }
        break;

    case VIR_DOMAIN_CHR_TYPE_TCP:
327
        if (def->source.data.tcp.listen != 1) {
328
            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
329
                           _("only TCP listen is supported for chr device"));
330 331 332
            return NULL;
        }

333
        if (virAsprintf(&ret, "%s%d=port:%s", dev, def->target.port,
334
                        def->source.data.tcp.service) < 0) {
335
            virReportOOMError();
336 337 338 339 340
            return NULL;
        }
        break;

    case VIR_DOMAIN_CHR_TYPE_FILE:
341 342 343
         {
            int fd_out;

344
            if ((fd_out = open(def->source.data.file.path,
345 346 347
                               O_WRONLY | O_APPEND | O_CREAT, 0660)) < 0) {
                virReportSystemError(errno,
                                     _("failed to open chardev file: %s"),
348
                                     def->source.data.file.path);
349 350 351 352
                return NULL;
            }
            if (virAsprintf(&ret, "%s%d=null,fd:%d", dev, def->target.port, fd_out) < 0) {
                virReportOOMError();
353
                VIR_FORCE_CLOSE(fd_out);
354 355
                return NULL;
            }
D
Daniel P. Berrange 已提交
356
            virCommandTransferFD(cmd, fd_out);
357 358 359 360 361
        }
        break;
   case VIR_DOMAIN_CHR_TYPE_PIPE:
        /* XXX could open the pipe & just pass the FDs. Be wary of
         * the effects of blocking I/O, though. */
362 363 364 365 366

    case VIR_DOMAIN_CHR_TYPE_VC:
    case VIR_DOMAIN_CHR_TYPE_UDP:
    case VIR_DOMAIN_CHR_TYPE_UNIX:
    default:
367
        virReportError(VIR_ERR_INTERNAL_ERROR,
368
                       _("unsupported chr device type %d"), def->source.type);
369 370 371 372 373 374
        break;
    }

    return ret;
}

375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
/*
 * Null-terminate the current argument and return a pointer to the next.
 * This should follow the same rules as the Linux kernel: arguments are
 * separated by spaces; arguments can be quoted with double quotes; double
 * quotes can't be escaped.
 */
static char *umlNextArg(char *args)
{
    int in_quote = 0;

    for (; *args; args++) {
        if (*args == ' ' && !in_quote) {
            *args++ = '\0';
            break;
        }
        if (*args == '"')
            in_quote = !in_quote;
    }

    while (*args == ' ')
        args++;

    return args;
}

400 401 402 403
/*
 * Constructs a argv suitable for launching uml with config defined
 * for a given virtual machine.
 */
D
Daniel P. Berrange 已提交
404 405 406
virCommandPtr umlBuildCommandLine(virConnectPtr conn,
                                  struct uml_driver *driver,
                                  virDomainObjPtr vm)
407
{
408
    int i, j;
D
Daniel P. Berrange 已提交
409
    virCommandPtr cmd;
410

D
Daniel P. Berrange 已提交
411 412 413 414 415
    cmd = virCommandNew(vm->def->os.kernel);

    virCommandAddEnvPassCommon(cmd);

    //virCommandAddArgPair(cmd, "con0", "fd:0,fd:1");
416
    virCommandAddArgFormat(cmd, "mem=%lluK", vm->def->mem.cur_balloon);
D
Daniel P. Berrange 已提交
417 418
    virCommandAddArgPair(cmd, "umid", vm->def->name);
    virCommandAddArgPair(cmd, "uml_dir", driver->monitorDir);
419 420

    if (vm->def->os.root)
D
Daniel P. Berrange 已提交
421
        virCommandAddArgPair(cmd, "root", vm->def->os.root);
422 423 424 425 426

    for (i = 0 ; i < vm->def->ndisks ; i++) {
        virDomainDiskDefPtr disk = vm->def->disks[i];

        if (!STRPREFIX(disk->dst, "ubd")) {
427
            virReportError(VIR_ERR_INTERNAL_ERROR,
428 429 430 431
                           _("unsupported disk type '%s'"), disk->dst);
            goto error;
        }

D
Daniel P. Berrange 已提交
432
        virCommandAddArgPair(cmd, disk->dst, disk->src);
433 434
    }

435
    for (i = 0 ; i < vm->def->nnets ; i++) {
436
        char *ret = umlBuildCommandLineNet(conn, vm->def, vm->def->nets[i], i);
437 438
        if (!ret)
            goto error;
D
Daniel P. Berrange 已提交
439 440
        virCommandAddArg(cmd, ret);
        VIR_FREE(ret);
441 442
    }

443
    for (i = 0 ; i < UML_MAX_CHAR_DEVICE ; i++) {
444
        virDomainChrDefPtr chr = NULL;
445
        char *ret = NULL;
446 447 448 449 450
        for (j = 0 ; j < vm->def->nconsoles ; j++)
            if (vm->def->consoles[j]->target.port == i)
                chr = vm->def->consoles[j];
        if (chr)
            ret = umlBuildCommandLineChr(chr, "con", cmd);
451
        if (!ret)
452
            if (virAsprintf(&ret, "con%d=none", i) < 0)
453
                goto no_memory;
D
Daniel P. Berrange 已提交
454 455
        virCommandAddArg(cmd, ret);
        VIR_FREE(ret);
456 457 458 459
    }

    for (i = 0 ; i < UML_MAX_CHAR_DEVICE ; i++) {
        virDomainChrDefPtr chr = NULL;
460
        char *ret = NULL;
461
        for (j = 0 ; j < vm->def->nserials ; j++)
462
            if (vm->def->serials[j]->target.port == i)
463 464
                chr = vm->def->serials[j];
        if (chr)
D
Daniel P. Berrange 已提交
465
            ret = umlBuildCommandLineChr(chr, "ssl", cmd);
466
        if (!ret)
467
            if (virAsprintf(&ret, "ssl%d=none", i) < 0)
468
                goto no_memory;
D
Daniel P. Berrange 已提交
469 470 471

        virCommandAddArg(cmd, ret);
        VIR_FREE(ret);
472 473
    }

474 475
    if (vm->def->os.cmdline) {
        char *args, *next_arg;
D
Daniel P. Berrange 已提交
476
        char *cmdline;
477 478 479 480 481 482 483 484 485
        if ((cmdline = strdup(vm->def->os.cmdline)) == NULL)
            goto no_memory;

        args = cmdline;
        while (*args == ' ')
            args++;

        while (*args) {
            next_arg = umlNextArg(args);
D
Daniel P. Berrange 已提交
486
            virCommandAddArg(cmd, args);
487 488
            args = next_arg;
        }
D
Daniel P. Berrange 已提交
489
        VIR_FREE(cmdline);
490 491
    }

D
Daniel P. Berrange 已提交
492
    return cmd;
493 494

 no_memory:
495
    virReportOOMError();
496
 error:
497

D
Daniel P. Berrange 已提交
498 499
    virCommandFree(cmd);
    return NULL;
500
}