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libvirt/src/xml.c
Daniel Veillard 892a8c3881 * include/libvirt/virterror.h src/virterror.c src/xend_internal.c 
src/xml.c: give proper indication of the failures raised by the
  XML parser on not well formed XML, should fix rhbz#208545
Daniel
2006-11-08 16:55:20 +00:00

1469 lines
43 KiB
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/*
* xml.c: XML based interfaces for the libvir library
*
* Copyright (C) 2005 Red Hat, Inc.
*
* See COPYING.LIB for the License of this software
*
* Daniel Veillard <veillard@redhat.com>
*/
#include "libvirt/libvirt.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <xs.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>
#include <math.h> /* for isnan() */
#include "internal.h"
#include "hash.h"
#include "sexpr.h"
#include "xml.h"
static void
virXMLError(virErrorNumber error, const char *info, int value)
{
const char *errmsg;
if (error == VIR_ERR_OK)
return;
errmsg = __virErrorMsg(error, info);
__virRaiseError(NULL, NULL, VIR_FROM_XML, error, VIR_ERR_ERROR,
errmsg, info, NULL, value, 0, errmsg, info, value);
}
/**
* virBufferGrow:
* @buf: the buffer
* @len: the minimum free size to allocate
*
* Grow the available space of an XML buffer.
*
* Returns the new available space or -1 in case of error
*/
static int
virBufferGrow(virBufferPtr buf, unsigned int len)
{
int size;
char *newbuf;
if (buf == NULL)
return (-1);
if (len + buf->use < buf->size)
return (0);
size = buf->use + len + 1000;
newbuf = (char *) realloc(buf->content, size);
if (newbuf == NULL) {
virXMLError(VIR_ERR_NO_MEMORY, _("growing buffer"), size);
return (-1);
}
buf->content = newbuf;
buf->size = size;
return (buf->size - buf->use);
}
/**
* virBufferAdd:
* @buf: the buffer to dump
* @str: the string
* @len: the number of bytes to add
*
* Add a string range to an XML buffer. if len == -1, the length of
* str is recomputed to the full string.
*
* Returns 0 successful, -1 in case of internal or API error.
*/
int
virBufferAdd(virBufferPtr buf, const char *str, int len)
{
unsigned int needSize;
if ((str == NULL) || (buf == NULL)) {
return -1;
}
if (len == 0)
return 0;
if (len < 0)
len = strlen(str);
needSize = buf->use + len + 2;
if (needSize > buf->size) {
if (!virBufferGrow(buf, needSize)) {
return (-1);
}
}
/* XXX: memmove() is 2x slower than memcpy(), do we really need it? */
memmove(&buf->content[buf->use], str, len);
buf->use += len;
buf->content[buf->use] = 0;
return (0);
}
virBufferPtr
virBufferNew(unsigned int size)
{
virBufferPtr buf;
if (!(buf = malloc(sizeof(*buf)))) {
virXMLError(VIR_ERR_NO_MEMORY, _("allocate new buffer"), sizeof(*buf));
return NULL;
}
if (size && (buf->content = malloc(size))==NULL) {
virXMLError(VIR_ERR_NO_MEMORY, _("allocate buffer content"), size);
free(buf);
return NULL;
}
buf->size = size;
buf->use = 0;
return buf;
}
void
virBufferFree(virBufferPtr buf)
{
if (buf) {
if (buf->content)
free(buf->content);
free(buf);
}
}
/**
* virBufferVSprintf:
* @buf: the buffer to dump
* @format: the format
* @argptr: the variable list of arguments
*
* Do a formatted print to an XML buffer.
*
* Returns 0 successful, -1 in case of internal or API error.
*/
int
virBufferVSprintf(virBufferPtr buf, const char *format, ...)
{
int size, count;
va_list locarg, argptr;
if ((format == NULL) || (buf == NULL)) {
return (-1);
}
size = buf->size - buf->use - 1;
va_start(argptr, format);
va_copy(locarg, argptr);
while (((count = vsnprintf(&buf->content[buf->use], size, format,
locarg)) < 0) || (count >= size - 1)) {
buf->content[buf->use] = 0;
va_end(locarg);
if (virBufferGrow(buf, 1000) < 0) {
return (-1);
}
size = buf->size - buf->use - 1;
va_copy(locarg, argptr);
}
va_end(locarg);
buf->use += count;
buf->content[buf->use] = 0;
return (0);
}
/**
* virBufferStrcat:
* @buf: the buffer to dump
* @argptr: the variable list of strings, the last argument must be NULL
*
* Concatenate strings to an XML buffer.
*
* Returns 0 successful, -1 in case of internal or API error.
*/
int
virBufferStrcat(virBufferPtr buf, ...)
{
va_list ap;
char *str;
va_start(ap, buf);
while ((str = va_arg(ap, char *)) != NULL) {
unsigned int len = strlen(str);
unsigned int needSize = buf->use + len + 2;
if (needSize > buf->size) {
if (!virBufferGrow(buf, needSize))
return -1;
}
memcpy(&buf->content[buf->use], str, len);
buf->use += len;
buf->content[buf->use] = 0;
}
va_end(ap);
return 0;
}
#if 0
/*
* This block of function are now implemented by a xend poll in
* xend_internal.c instead of querying the Xen store, code is kept
* for reference of in case Xend may not be available in the future ...
*/
/**
* virDomainGetXMLDevice:
* @domain: a domain object
* @sub: the xenstore subsection 'vbd', 'vif', ...
* @dev: the xenstrore internal device number
* @name: the value's name
*
* Extract one information the device used by the domain from xensttore
*
* Returns the new string or NULL in case of error
*/
static char *
virDomainGetXMLDeviceInfo(virDomainPtr domain, const char *sub,
long dev, const char *name)
{
char s[256];
unsigned int len = 0;
snprintf(s, 255, "/local/domain/0/backend/%s/%d/%ld/%s",
sub, domain->handle, dev, name);
s[255] = 0;
return xs_read(domain->conn->xshandle, 0, &s[0], &len);
}
/**
* virDomainGetXMLDevice:
* @domain: a domain object
* @buf: the output buffer object
* @dev: the xenstrore internal device number
*
* Extract and dump in the buffer information on the device used by the domain
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
virDomainGetXMLDevice(virDomainPtr domain, virBufferPtr buf, long dev)
{
char *type, *val;
type = virDomainGetXMLDeviceInfo(domain, "vbd", dev, "type");
if (type == NULL)
return (-1);
if (!strcmp(type, "file")) {
virBufferVSprintf(buf, " <disk type='file'>\n");
val = virDomainGetXMLDeviceInfo(domain, "vbd", dev, "params");
if (val != NULL) {
virBufferVSprintf(buf, " <source file='%s'/>\n", val);
free(val);
}
val = virDomainGetXMLDeviceInfo(domain, "vbd", dev, "dev");
if (val != NULL) {
char *tmp = val;
if (!strncmp(tmp, "ioemu:", 6))
tmp += 6;
virBufferVSprintf(buf, " <target dev='%s'/>\n", tmp);
free(val);
}
val = virDomainGetXMLDeviceInfo(domain, "vbd", dev, "read-only");
if (val != NULL) {
virBufferVSprintf(buf, " <readonly/>\n", val);
free(val);
}
virBufferAdd(buf, " </disk>\n", 12);
} else if (!strcmp(type, "phy")) {
virBufferVSprintf(buf, " <disk type='device'>\n");
val = virDomainGetXMLDeviceInfo(domain, "vbd", dev, "params");
if (val != NULL) {
virBufferVSprintf(buf, " <source device='%s'/>\n", val);
free(val);
}
val = virDomainGetXMLDeviceInfo(domain, "vbd", dev, "dev");
if (val != NULL) {
char *tmp = val;
if (!strncmp(tmp, "ioemu:", 6))
tmp += 6;
virBufferVSprintf(buf, " <target dev='%s'/>\n", tmp);
free(val);
}
val = virDomainGetXMLDeviceInfo(domain, "vbd", dev, "read-only");
if (val != NULL) {
virBufferVSprintf(buf, " <readonly/>\n", val);
free(val);
}
virBufferAdd(buf, " </disk>\n", 12);
} else {
TODO fprintf(stderr, "Don't know how to handle device type %s\n",
type);
}
free(type);
return (0);
}
/**
* virDomainGetXMLDevices:
* @domain: a domain object
* @buf: the output buffer object
*
* Extract the devices used by the domain and dumps then in the buffer
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
virDomainGetXMLDevices(virDomainPtr domain, virBufferPtr buf)
{
int ret = -1;
unsigned int num, i;
long id;
char **list = NULL, *endptr;
char backend[200];
virConnectPtr conn;
if (!VIR_IS_CONNECTED_DOMAIN(domain))
return (-1);
conn = domain->conn;
snprintf(backend, 199, "/local/domain/0/backend/vbd/%d",
virDomainGetID(domain));
backend[199] = 0;
list = xs_directory(conn->xshandle, 0, backend, &num);
ret = 0;
if (list == NULL)
goto done;
for (i = 0; i < num; i++) {
id = strtol(list[i], &endptr, 10);
if ((endptr == list[i]) || (*endptr != 0)) {
ret = -1;
goto done;
}
virDomainGetXMLDevice(domain, buf, id);
}
done:
if (list != NULL)
free(list);
return (ret);
}
/**
* virDomainGetXMLInterface:
* @domain: a domain object
* @buf: the output buffer object
* @dev: the xenstrore internal device number
*
* Extract and dump in the buffer information on the interface used by
* the domain
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
virDomainGetXMLInterface(virDomainPtr domain, virBufferPtr buf, long dev)
{
char *type, *val;
type = virDomainGetXMLDeviceInfo(domain, "vif", dev, "bridge");
if (type == NULL) {
virBufferVSprintf(buf, " <interface type='default'>\n");
val = virDomainGetXMLDeviceInfo(domain, "vif", dev, "mac");
if (val != NULL) {
virBufferVSprintf(buf, " <mac address='%s'/>\n", val);
free(val);
}
val = virDomainGetXMLDeviceInfo(domain, "vif", dev, "script");
if (val != NULL) {
virBufferVSprintf(buf, " <script path='%s'/>\n", val);
free(val);
}
virBufferAdd(buf, " </interface>\n", 17);
} else {
virBufferVSprintf(buf, " <interface type='bridge'>\n");
virBufferVSprintf(buf, " <source bridge='%s'/>\n", type);
val = virDomainGetXMLDeviceInfo(domain, "vif", dev, "mac");
if (val != NULL) {
virBufferVSprintf(buf, " <mac address='%s'/>\n", val);
free(val);
}
val = virDomainGetXMLDeviceInfo(domain, "vif", dev, "script");
if (val != NULL) {
virBufferVSprintf(buf, " <script path='%s'/>\n", val);
free(val);
}
virBufferAdd(buf, " </interface>\n", 17);
}
free(type);
return (0);
}
/**
* virDomainGetXMLInterfaces:
* @domain: a domain object
* @buf: the output buffer object
*
* Extract the interfaces used by the domain and dumps then in the buffer
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
virDomainGetXMLInterfaces(virDomainPtr domain, virBufferPtr buf)
{
int ret = -1;
unsigned int num, i;
long id;
char **list = NULL, *endptr;
char backend[200];
virConnectPtr conn;
if (!VIR_IS_CONNECTED_DOMAIN(domain))
return (-1);
conn = domain->conn;
snprintf(backend, 199, "/local/domain/0/backend/vif/%d",
virDomainGetID(domain));
backend[199] = 0;
list = xs_directory(conn->xshandle, 0, backend, &num);
ret = 0;
if (list == NULL)
goto done;
for (i = 0; i < num; i++) {
id = strtol(list[i], &endptr, 10);
if ((endptr == list[i]) || (*endptr != 0)) {
ret = -1;
goto done;
}
virDomainGetXMLInterface(domain, buf, id);
}
done:
if (list != NULL)
free(list);
return (ret);
}
/**
* virDomainGetXMLBoot:
* @domain: a domain object
* @buf: the output buffer object
*
* Extract the boot information used to start that domain
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
virDomainGetXMLBoot(virDomainPtr domain, virBufferPtr buf)
{
char *vm, *str;
if (!VIR_IS_DOMAIN(domain))
return (-1);
vm = virDomainGetVM(domain);
if (vm == NULL)
return (-1);
virBufferAdd(buf, " <os>\n", 7);
str = virDomainGetVMInfo(domain, vm, "image/ostype");
if (str != NULL) {
virBufferVSprintf(buf, " <type>%s</type>\n", str);
free(str);
}
str = virDomainGetVMInfo(domain, vm, "image/kernel");
if (str != NULL) {
virBufferVSprintf(buf, " <kernel>%s</kernel>\n", str);
free(str);
}
str = virDomainGetVMInfo(domain, vm, "image/ramdisk");
if (str != NULL) {
if (str[0] != 0)
virBufferVSprintf(buf, " <initrd>%s</initrd>\n", str);
free(str);
}
str = virDomainGetVMInfo(domain, vm, "image/cmdline");
if (str != NULL) {
if (str[0] != 0)
virBufferVSprintf(buf, " <cmdline>%s</cmdline>\n", str);
free(str);
}
virBufferAdd(buf, " </os>\n", 8);
free(vm);
return (0);
}
/**
* virDomainGetXMLDesc:
* @domain: a domain object
* @flags: and OR'ed set of extraction flags, not used yet
*
* Provide an XML description of the domain. NOTE: this API is subject
* to changes.
*
* Returns a 0 terminated UTF-8 encoded XML instance, or NULL in case of error.
* the caller must free() the returned value.
*/
char *
virDomainGetXMLDesc(virDomainPtr domain, int flags)
{
char *ret = NULL;
unsigned char uuid[16];
virBuffer buf;
virDomainInfo info;
if (!VIR_IS_DOMAIN(domain))
return (NULL);
if (flags != 0)
return (NULL);
if (virDomainGetInfo(domain, &info) < 0)
return (NULL);
ret = malloc(1000);
if (ret == NULL)
return (NULL);
buf.content = ret;
buf.size = 1000;
buf.use = 0;
virBufferVSprintf(&buf, "<domain type='xen' id='%d'>\n",
virDomainGetID(domain));
virBufferVSprintf(&buf, " <name>%s</name>\n",
virDomainGetName(domain));
if (virDomainGetUUID(domain, &uuid[0]) == 0) {
virBufferVSprintf(&buf,
" <uuid>%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x</uuid>\n",
uuid[0], uuid[1], uuid[2], uuid[3],
uuid[4], uuid[5], uuid[6], uuid[7],
uuid[8], uuid[9], uuid[10], uuid[11],
uuid[12], uuid[13], uuid[14], uuid[15]);
}
virDomainGetXMLBoot(domain, &buf);
virBufferVSprintf(&buf, " <memory>%lu</memory>\n", info.maxMem);
virBufferVSprintf(&buf, " <vcpu>%d</vcpu>\n", (int) info.nrVirtCpu);
virBufferAdd(&buf, " <devices>\n", 12);
virDomainGetXMLDevices(domain, &buf);
virDomainGetXMLInterfaces(domain, &buf);
virBufferAdd(&buf, " </devices>\n", 13);
virBufferAdd(&buf, "</domain>\n", 10);
buf.content[buf.use] = 0;
return (ret);
}
#endif /* 0 - UNUSED */
#ifndef PROXY
/**
* virtDomainParseXMLGraphicsDesc:
* @node: node containing graphics description
* @buf: a buffer for the result S-Expr
* @xendConfigVersion: xend configuration file format
*
* Parse the graphics part of the XML description and add it to the S-Expr
* in buf. This is a temporary interface as the S-Expr interface will be
* replaced by XML-RPC in the future. However the XML format should stay
* valid over time.
*
* Returns 0 in case of success, -1 in case of error
*/
static int virDomainParseXMLGraphicsDesc(xmlNodePtr node, virBufferPtr buf, int xendConfigVersion)
{
xmlChar *graphics_type = NULL;
graphics_type = xmlGetProp(node, BAD_CAST "type");
if (graphics_type != NULL) {
if (xmlStrEqual(graphics_type, BAD_CAST "sdl")) {
virBufferAdd(buf, "(sdl 1)", 7);
// TODO:
// Need to understand sdl options
//
//virBufferAdd(buf, "(display localhost:10.0)", 24);
//virBufferAdd(buf, "(xauthority /root/.Xauthority)", 30);
}
else if (xmlStrEqual(graphics_type, BAD_CAST "vnc")) {
virBufferAdd(buf, "(vnc 1)", 7);
if (xendConfigVersion >= 2) {
xmlChar *vncport = xmlGetProp(node, BAD_CAST "port");
if (vncport != NULL) {
long port = strtol((const char *)vncport, NULL, 10);
if (port == -1)
virBufferAdd(buf, "(vncunused 1)", 13);
else if (port > 5900)
virBufferVSprintf(buf, "(vncdisplay %d)", port - 5900);
xmlFree(vncport);
}
}
}
xmlFree(graphics_type);
}
return 0;
}
/**
* virDomainParseXMLOSDescHVM:
* @node: node containing HVM OS description
* @buf: a buffer for the result S-Expr
* @ctxt: a path context representing the XML description
* @xendConfigVersion: xend configuration file format
*
* Parse the OS part of the XML description for an HVM domain and add it to
* the S-Expr in buf. This is a temporary interface as the S-Expr interface
* will be replaced by XML-RPC in the future. However the XML format should
* stay valid over time.
*
* Returns 0 in case of success, -1 in case of error.
*/
static int
virDomainParseXMLOSDescHVM(xmlNodePtr node, virBufferPtr buf, xmlXPathContextPtr ctxt, int xendConfigVersion)
{
xmlXPathObjectPtr obj = NULL;
xmlNodePtr cur, txt;
xmlChar *type = NULL;
xmlChar *loader = NULL;
xmlChar *boot_dev = NULL;
int res;
cur = node->children;
while (cur != NULL) {
if (cur->type == XML_ELEMENT_NODE) {
if ((type == NULL)
&& (xmlStrEqual(cur->name, BAD_CAST "type"))) {
txt = cur->children;
if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
(txt->next == NULL))
type = txt->content;
} else if ((loader == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "loader"))) {
txt = cur->children;
if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
(txt->next == NULL))
loader = txt->content;
} else if ((boot_dev == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "boot"))) {
boot_dev = xmlGetProp(cur, BAD_CAST "dev");
}
}
cur = cur->next;
}
if ((type == NULL) || (!xmlStrEqual(type, BAD_CAST "hvm"))) {
/* VIR_ERR_OS_TYPE */
virXMLError(VIR_ERR_OS_TYPE, (const char *) type, 0);
return (-1);
}
virBufferAdd(buf, "(image (hvm ", 12);
if (loader == NULL) {
virXMLError(VIR_ERR_NO_KERNEL, NULL, 0);
goto error;
} else {
virBufferVSprintf(buf, "(kernel '%s')", (const char *) loader);
}
/* get the device emulation model */
obj = xmlXPathEval(BAD_CAST "string(/domain/devices/emulator[1])", ctxt);
if ((obj == NULL) || (obj->type != XPATH_STRING) ||
(obj->stringval == NULL) || (obj->stringval[0] == 0)) {
virXMLError(VIR_ERR_NO_KERNEL, NULL, 0); /* TODO: error */
goto error;
}
virBufferVSprintf(buf, "(device_model '%s')",
(const char *) obj->stringval);
xmlXPathFreeObject(obj);
obj = NULL;
if (boot_dev) {
if (xmlStrEqual(boot_dev, BAD_CAST "fd")) {
virBufferVSprintf(buf, "(boot a)", (const char *) boot_dev);
} else if (xmlStrEqual(boot_dev, BAD_CAST "cdrom")) {
virBufferVSprintf(buf, "(boot d)", (const char *) boot_dev);
} else if (xmlStrEqual(boot_dev, BAD_CAST "hd")) {
virBufferVSprintf(buf, "(boot c)", (const char *) boot_dev);
} else {
/* Any other type of boot dev is unsupported right now */
virXMLError(VIR_ERR_XML_ERROR, NULL, 0);
}
/* get the 1st floppy device file */
obj = xmlXPathEval(BAD_CAST "/domain/devices/disk[@device='floppy' and target/@dev='fda']/source", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr == 1)) {
cur = obj->nodesetval->nodeTab[0];
virBufferVSprintf(buf, "(fda '%s')",
(const char *) xmlGetProp(cur, BAD_CAST "file"));
cur = NULL;
}
if (obj) {
xmlXPathFreeObject(obj);
obj = NULL;
}
/* get the 2nd floppy device file */
obj = xmlXPathEval(BAD_CAST "/domain/devices/disk[@device='floppy' and target/@dev='fdb']/source", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr == 1)) {
xmlChar *fdfile = NULL;
cur = obj->nodesetval->nodeTab[0];
fdfile = xmlGetProp(cur, BAD_CAST "file");
virBufferVSprintf(buf, "(fdb '%s')",
(const char *) fdfile);
xmlFree(fdfile);
cur = NULL;
}
if (obj) {
xmlXPathFreeObject(obj);
obj = NULL;
}
/* get the cdrom device file */
/* Only XenD <= 3.0.2 wants cdrom config here */
if (xendConfigVersion == 1) {
obj = xmlXPathEval(BAD_CAST "/domain/devices/disk[@device='cdrom' and target/@dev='hdc']/source", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr == 1)) {
xmlChar *cdfile = NULL;
cur = obj->nodesetval->nodeTab[0];
cdfile = xmlGetProp(cur, BAD_CAST "file");
virBufferVSprintf(buf, "(cdrom '%s')",
(const char *)cdfile);
xmlFree(cdfile);
cur = NULL;
}
if (obj) {
xmlXPathFreeObject(obj);
obj = NULL;
}
}
obj = xmlXPathEval(BAD_CAST "/domain/features/acpi", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr == 1)) {
virBufferAdd(buf, "(acpi 1)", 8);
}
if (obj)
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "/domain/features/apic", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr == 1)) {
virBufferAdd(buf, "(apic 1)", 8);
}
if (obj)
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "/domain/features/pae", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr == 1)) {
virBufferAdd(buf, "(pae 1)", 7);
}
if (obj)
xmlXPathFreeObject(obj);
obj = NULL;
}
obj = xmlXPathEval(BAD_CAST "count(domain/devices/console) > 0", ctxt);
if ((obj == NULL) || (obj->type != XPATH_BOOLEAN)) {
virXMLError(VIR_ERR_XML_ERROR, NULL, 0);
goto error;
}
if (obj->boolval) {
virBufferAdd(buf, "(serial pty)", 12);
}
xmlXPathFreeObject(obj);
obj = NULL;
/* Is a graphics device specified? */
obj = xmlXPathEval(BAD_CAST "/domain/devices/graphics[1]", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr > 0)) {
res = virDomainParseXMLGraphicsDesc(obj->nodesetval->nodeTab[0], buf, xendConfigVersion);
if (res != 0) {
goto error;
}
}
xmlXPathFreeObject(obj);
virBufferAdd(buf, "))", 2);
if (boot_dev)
xmlFree(boot_dev);
return (0);
error:
if (boot_dev)
xmlFree(boot_dev);
if (obj != NULL)
xmlXPathFreeObject(obj);
return(-1);
}
/**
* virDomainParseXMLOSDescPV:
* @node: node containing PV OS description
* @buf: a buffer for the result S-Expr
* @ctxt: a path context representing the XML description
* @xendConfigVersion: xend configuration file format
*
* Parse the OS part of the XML description for a paravirtualized domain
* and add it to the S-Expr in buf. This is a temporary interface as the
* S-Expr interface will be replaced by XML-RPC in the future. However
* the XML format should stay valid over time.
*
* Returns 0 in case of success, -1 in case of error.
*/
static int
virDomainParseXMLOSDescPV(xmlNodePtr node, virBufferPtr buf, xmlXPathContextPtr ctxt, int xendConfigVersion)
{
xmlNodePtr cur, txt;
xmlXPathObjectPtr obj = NULL;
const xmlChar *type = NULL;
const xmlChar *root = NULL;
const xmlChar *kernel = NULL;
const xmlChar *initrd = NULL;
const xmlChar *cmdline = NULL;
int res;
cur = node->children;
while (cur != NULL) {
if (cur->type == XML_ELEMENT_NODE) {
if ((type == NULL)
&& (xmlStrEqual(cur->name, BAD_CAST "type"))) {
txt = cur->children;
if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
(txt->next == NULL))
type = txt->content;
} else if ((kernel == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "kernel"))) {
txt = cur->children;
if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
(txt->next == NULL))
kernel = txt->content;
} else if ((root == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "root"))) {
txt = cur->children;
if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
(txt->next == NULL))
root = txt->content;
} else if ((initrd == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "initrd"))) {
txt = cur->children;
if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
(txt->next == NULL))
initrd = txt->content;
} else if ((cmdline == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "cmdline"))) {
txt = cur->children;
if ((txt != NULL) && (txt->type == XML_TEXT_NODE) &&
(txt->next == NULL))
cmdline = txt->content;
}
}
cur = cur->next;
}
if ((type != NULL) && (!xmlStrEqual(type, BAD_CAST "linux"))) {
/* VIR_ERR_OS_TYPE */
virXMLError(VIR_ERR_OS_TYPE, (const char *) type, 0);
return (-1);
}
virBufferAdd(buf, "(image (linux ", 14);
if (kernel == NULL) {
virXMLError(VIR_ERR_NO_KERNEL, NULL, 0);
return (-1);
} else {
virBufferVSprintf(buf, "(kernel '%s')", (const char *) kernel);
}
if (initrd != NULL)
virBufferVSprintf(buf, "(ramdisk '%s')", (const char *) initrd);
if (root != NULL)
virBufferVSprintf(buf, "(root '%s')", (const char *) root);
if (cmdline != NULL)
virBufferVSprintf(buf, "(args '%s')", (const char *) cmdline);
/* Is a graphics device specified? */
obj = xmlXPathEval(BAD_CAST "/domain/devices/graphics[1]", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr > 0)) {
res = virDomainParseXMLGraphicsDesc(obj->nodesetval->nodeTab[0], buf, xendConfigVersion);
if (res != 0) {
goto error;
}
}
xmlXPathFreeObject(obj);
error:
virBufferAdd(buf, "))", 2);
return (0);
}
/**
* virCatchXMLParseError:
* @ctx: the context
* @msg: the error message
* @...: extra arguments
*
* SAX callback on parsing errors, act as a gate for libvirt own
* error reporting.
*/
static void
virCatchXMLParseError(void *ctx, const char *msg, ...) {
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
if ((ctxt != NULL) &&
(ctxt->lastError.level == XML_ERR_FATAL) &&
(ctxt->lastError.message != NULL)) {
virXMLError(VIR_ERR_XML_DETAIL, ctxt->lastError.message,
ctxt->lastError.line);
}
}
/**
* virDomainParseXMLDiskDesc:
* @node: node containing disk description
* @buf: a buffer for the result S-Expr
* @xendConfigVersion: xend configuration file format
*
* Parse the one disk in the XML description and add it to the S-Expr in buf
* This is a temporary interface as the S-Expr interface
* will be replaced by XML-RPC in the future. However the XML format should
* stay valid over time.
*
* Returns 0 in case of success, -1 in case of error.
*/
static int
virDomainParseXMLDiskDesc(xmlNodePtr node, virBufferPtr buf, int hvm, int xendConfigVersion)
{
xmlNodePtr cur;
xmlChar *type = NULL;
xmlChar *device = NULL;
xmlChar *source = NULL;
xmlChar *target = NULL;
xmlChar *drvName = NULL;
xmlChar *drvType = NULL;
int ro = 0;
int typ = 0;
int cdrom = 0;
type = xmlGetProp(node, BAD_CAST "type");
if (type != NULL) {
if (xmlStrEqual(type, BAD_CAST "file"))
typ = 0;
else if (xmlStrEqual(type, BAD_CAST "block"))
typ = 1;
xmlFree(type);
}
device = xmlGetProp(node, BAD_CAST "device");
cur = node->children;
while (cur != NULL) {
if (cur->type == XML_ELEMENT_NODE) {
if ((source == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "source"))) {
if (typ == 0)
source = xmlGetProp(cur, BAD_CAST "file");
else
source = xmlGetProp(cur, BAD_CAST "dev");
} else if ((target == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "target"))) {
target = xmlGetProp(cur, BAD_CAST "dev");
} else if ((drvName == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "driver"))) {
drvName = xmlGetProp(cur, BAD_CAST "name");
if (drvName && !strcmp((const char *)drvName, "tap"))
drvType = xmlGetProp(cur, BAD_CAST "type");
} else if (xmlStrEqual(cur->name, BAD_CAST "readonly")) {
ro = 1;
}
}
cur = cur->next;
}
if (source == NULL) {
virXMLError(VIR_ERR_NO_SOURCE, (const char *) target, 0);
if (target != NULL)
xmlFree(target);
if (device != NULL)
xmlFree(device);
return (-1);
}
if (target == NULL) {
virXMLError(VIR_ERR_NO_TARGET, (const char *) source, 0);
if (source != NULL)
xmlFree(source);
if (device != NULL)
xmlFree(device);
return (-1);
}
/* Xend (all versions) put the floppy device config
* under the hvm (image (os)) block
*/
if (hvm &&
device &&
!strcmp((const char *)device, "floppy")) {
goto cleanup;
}
/* Xend <= 3.0.2 doesn't include cdrom config here */
if (hvm &&
device &&
!strcmp((const char *)device, "cdrom")) {
if (xendConfigVersion == 1)
goto cleanup;
else
cdrom = 1;
}
virBufferAdd(buf, "(device ", 8);
/* Normally disks are in a (device (vbd ...)) block
but blktap disks ended up in a differently named
(device (tap ....)) block.... */
if (drvName && !strcmp((const char *)drvName, "tap")) {
virBufferAdd(buf, "(tap ", 5);
} else {
virBufferAdd(buf, "(vbd ", 5);
}
if (hvm) {
char *tmp = (char *)target;
/* Just in case user mistakenly still puts ioemu: in their XML */
if (!strncmp((const char *) tmp, "ioemu:", 6))
tmp += 6;
/* Xend <= 3.0.2 wants a ioemu: prefix on devices for HVM */
if (xendConfigVersion == 1)
virBufferVSprintf(buf, "(dev 'ioemu:%s')", (const char *)tmp);
else /* But newer does not */
virBufferVSprintf(buf, "(dev '%s%s')", (const char *)tmp, cdrom ? ":cdrom" : ":disk");
} else
virBufferVSprintf(buf, "(dev '%s')", (const char *)target);
if (drvName) {
if (!strcmp((const char *)drvName, "tap")) {
virBufferVSprintf(buf, "(uname '%s:%s:%s')",
(const char *)drvName,
(drvType ? (const char *)drvType : "aio"),
(const char *)source);
} else {
virBufferVSprintf(buf, "(uname '%s:%s')",
(const char *)drvName,
(const char *)source);
}
} else {
if (typ == 0)
virBufferVSprintf(buf, "(uname 'file:%s')", source);
else if (typ == 1) {
if (source[0] == '/')
virBufferVSprintf(buf, "(uname 'phy:%s')", source);
else
virBufferVSprintf(buf, "(uname 'phy:/dev/%s')", source);
}
}
if (ro == 0)
virBufferVSprintf(buf, "(mode 'w')");
else if (ro == 1)
virBufferVSprintf(buf, "(mode 'r')");
virBufferAdd(buf, ")", 1);
virBufferAdd(buf, ")", 1);
cleanup:
xmlFree(drvType);
xmlFree(drvName);
xmlFree(device);
xmlFree(target);
xmlFree(source);
return (0);
}
/**
* virDomainParseXMLIfDesc:
* @node: node containing the interface description
* @buf: a buffer for the result S-Expr
*
* Parse the one interface the XML description and add it to the S-Expr in buf
* This is a temporary interface as the S-Expr interface
* will be replaced by XML-RPC in the future. However the XML format should
* stay valid over time.
*
* Returns 0 in case of success, -1 in case of error.
*/
static int
virDomainParseXMLIfDesc(xmlNodePtr node, virBufferPtr buf, int hvm)
{
xmlNodePtr cur;
xmlChar *type = NULL;
xmlChar *source = NULL;
xmlChar *mac = NULL;
xmlChar *script = NULL;
int typ = 0;
type = xmlGetProp(node, BAD_CAST "type");
if (type != NULL) {
if (xmlStrEqual(type, BAD_CAST "bridge"))
typ = 0;
else if (xmlStrEqual(type, BAD_CAST "ethernet"))
typ = 1;
xmlFree(type);
}
cur = node->children;
while (cur != NULL) {
if (cur->type == XML_ELEMENT_NODE) {
if ((source == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "source"))) {
if (typ == 0)
source = xmlGetProp(cur, BAD_CAST "bridge");
else
source = xmlGetProp(cur, BAD_CAST "dev");
} else if ((mac == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "mac"))) {
mac = xmlGetProp(cur, BAD_CAST "address");
} else if ((script == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "script"))) {
script = xmlGetProp(cur, BAD_CAST "path");
}
}
cur = cur->next;
}
virBufferAdd(buf, "(vif ", 5);
if (mac != NULL)
virBufferVSprintf(buf, "(mac '%s')", (const char *) mac);
if (source != NULL) {
if (typ == 0)
virBufferVSprintf(buf, "(bridge '%s')", (const char *) source);
else /* TODO does that work like that ? */
virBufferVSprintf(buf, "(dev '%s')", (const char *) source);
}
if (script != NULL)
virBufferVSprintf(buf, "(script '%s')", script);
if (hvm)
virBufferAdd(buf, "(type ioemu)", 12);
virBufferAdd(buf, ")", 1);
if (mac != NULL)
xmlFree(mac);
if (source != NULL)
xmlFree(source);
if (script != NULL)
xmlFree(script);
return (0);
}
/**
* virDomainParseXMLDesc:
* @xmldesc: string with the XML description
* @xendConfigVersion: xend configuration file format
*
* Parse the XML description and turn it into the xend sexp needed to
* create the comain. This is a temporary interface as the S-Expr interface
* will be replaced by XML-RPC in the future. However the XML format should
* stay valid over time.
*
* Returns the 0 terminatedi S-Expr string or NULL in case of error.
* the caller must free() the returned value.
*/
char *
virDomainParseXMLDesc(const char *xmldesc, char **name, int xendConfigVersion)
{
xmlDocPtr xml = NULL;
xmlNodePtr node;
char *ret = NULL, *nam = NULL;
virBuffer buf;
xmlChar *prop;
xmlParserCtxtPtr pctxt;
xmlXPathObjectPtr obj = NULL;
xmlXPathObjectPtr tmpobj = NULL;
xmlXPathContextPtr ctxt = NULL;
int i, res;
int bootloader = 0;
int hvm = 0;
if (name != NULL)
*name = NULL;
ret = malloc(1000);
if (ret == NULL)
return (NULL);
buf.content = ret;
buf.size = 1000;
buf.use = 0;
pctxt = xmlNewParserCtxt();
if ((pctxt == NULL) || (pctxt->sax == NULL)) {
goto error;
}
pctxt->sax->error = virCatchXMLParseError;
xml = xmlCtxtReadDoc(pctxt, (const xmlChar *) xmldesc, "domain.xml", NULL,
XML_PARSE_NOENT | XML_PARSE_NONET |
XML_PARSE_NOWARNING);
if (xml == NULL) {
goto error;
}
node = xmlDocGetRootElement(xml);
if ((node == NULL) || (!xmlStrEqual(node->name, BAD_CAST "domain")))
goto error;
prop = xmlGetProp(node, BAD_CAST "type");
if (prop != NULL) {
if (!xmlStrEqual(prop, BAD_CAST "xen")) {
xmlFree(prop);
goto error;
}
xmlFree(prop);
}
virBufferAdd(&buf, "(vm ", 4);
ctxt = xmlXPathNewContext(xml);
if (ctxt == NULL) {
goto error;
}
/*
* extract some of the basics, name, memory, cpus ...
*/
obj = xmlXPathEval(BAD_CAST "string(/domain/name[1])", ctxt);
if ((obj == NULL) || (obj->type != XPATH_STRING) ||
(obj->stringval == NULL) || (obj->stringval[0] == 0)) {
virXMLError(VIR_ERR_NO_NAME, xmldesc, 0);
goto error;
}
virBufferVSprintf(&buf, "(name '%s')", obj->stringval);
nam = strdup((const char *) obj->stringval);
if (nam == NULL) {
virXMLError(VIR_ERR_NO_MEMORY, "copying name", 0);
goto error;
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "number(/domain/memory[1])", ctxt);
if ((obj == NULL) || (obj->type != XPATH_NUMBER) ||
(isnan(obj->floatval)) || (obj->floatval < 64000)) {
virBufferVSprintf(&buf, "(memory 128)(maxmem 128)");
} else {
unsigned long mem = (obj->floatval / 1024);
virBufferVSprintf(&buf, "(memory %lu)(maxmem %lu)", mem, mem);
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "number(/domain/vcpu[1])", ctxt);
if ((obj == NULL) || (obj->type != XPATH_NUMBER) ||
(isnan(obj->floatval)) || (obj->floatval <= 0)) {
virBufferVSprintf(&buf, "(vcpus 1)");
} else {
unsigned int cpu = (unsigned int) obj->floatval;
virBufferVSprintf(&buf, "(vcpus %u)", cpu);
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/uuid[1])", ctxt);
if ((obj == NULL) || ((obj->type == XPATH_STRING) &&
(obj->stringval != NULL) && (obj->stringval[0] != 0))) {
virBufferVSprintf(&buf, "(uuid '%s')", obj->stringval);
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/bootloader[1])", ctxt);
if ((obj != NULL) && (obj->type == XPATH_STRING) &&
(obj->stringval != NULL) && (obj->stringval[0] != 0)) {
virBufferVSprintf(&buf, "(bootloader '%s')", obj->stringval);
bootloader = 1;
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/on_poweroff[1])", ctxt);
if ((obj != NULL) && (obj->type == XPATH_STRING) &&
(obj->stringval != NULL) && (obj->stringval[0] != 0)) {
virBufferVSprintf(&buf, "(on_poweroff '%s')", obj->stringval);
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/on_reboot[1])", ctxt);
if ((obj != NULL) && (obj->type == XPATH_STRING) &&
(obj->stringval != NULL) && (obj->stringval[0] != 0)) {
virBufferVSprintf(&buf, "(on_reboot '%s')", obj->stringval);
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/on_crash[1])", ctxt);
if ((obj != NULL) && (obj->type == XPATH_STRING) &&
(obj->stringval != NULL) && (obj->stringval[0] != 0)) {
virBufferVSprintf(&buf, "(on_crash '%s')", obj->stringval);
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "/domain/os[1]", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr == 1)) {
/* Analyze of the os description, based on HVM or PV. */
tmpobj = xmlXPathEval(BAD_CAST "string(/domain/os/type[1])", ctxt);
if ((tmpobj != NULL) &&
((tmpobj->type != XPATH_STRING) || (tmpobj->stringval == NULL) ||
(tmpobj->stringval[0] == 0))) {
xmlXPathFreeObject(tmpobj);
virXMLError(VIR_ERR_OS_TYPE, nam, 0);
goto error;
}
if ((tmpobj == NULL) || !xmlStrEqual(tmpobj->stringval, BAD_CAST "hvm")) {
res = virDomainParseXMLOSDescPV(obj->nodesetval->nodeTab[0], &buf, ctxt, xendConfigVersion);
} else {
hvm = 1;
res = virDomainParseXMLOSDescHVM(obj->nodesetval->nodeTab[0], &buf, ctxt, xendConfigVersion);
}
xmlXPathFreeObject(tmpobj);
if (res != 0)
goto error;
} else if (bootloader == 0) {
virXMLError(VIR_ERR_NO_OS, nam, 0);
goto error;
}
xmlXPathFreeObject(obj);
/* analyze of the devices */
obj = xmlXPathEval(BAD_CAST "/domain/devices/disk", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr >= 0)) {
for (i = 0; i < obj->nodesetval->nodeNr; i++) {
res = virDomainParseXMLDiskDesc(obj->nodesetval->nodeTab[i], &buf, hvm, xendConfigVersion);
if (res != 0) {
goto error;
}
}
}
xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "/domain/devices/interface", ctxt);
if ((obj != NULL) && (obj->type == XPATH_NODESET) &&
(obj->nodesetval != NULL) && (obj->nodesetval->nodeNr >= 0)) {
for (i = 0; i < obj->nodesetval->nodeNr; i++) {
virBufferAdd(&buf, "(device ", 8);
res = virDomainParseXMLIfDesc(obj->nodesetval->nodeTab[i], &buf, hvm);
if (res != 0) {
goto error;
}
virBufferAdd(&buf, ")", 1);
}
}
xmlXPathFreeObject(obj);
virBufferAdd(&buf, ")", 1); /* closes (vm */
buf.content[buf.use] = 0;
xmlXPathFreeContext(ctxt);
xmlFreeDoc(xml);
if (name != NULL)
*name = nam;
else
free(nam);
return (ret);
error:
if (nam != NULL)
free(nam);
if (name != NULL)
*name = NULL;
if (obj != NULL)
xmlXPathFreeObject(obj);
if (ctxt != NULL)
xmlXPathFreeContext(ctxt);
if (xml != NULL)
xmlFreeDoc(xml);
if (ret != NULL)
free(ret);
return (NULL);
}
#endif /* !PROXY */
unsigned char *virParseUUID(char **ptr, const char *uuid) {
int rawuuid[16];
const char *cur;
unsigned char *dst_uuid = NULL;
int i;
if (uuid == NULL)
goto error;
/*
* do a liberal scan allowing '-' and ' ' anywhere between character
* pairs as long as there is 32 of them in the end.
*/
cur = uuid;
for (i = 0;i < 16;) {
rawuuid[i] = 0;
if (*cur == 0)
goto error;
if ((*cur == '-') || (*cur == ' ')) {
cur++;
continue;
}
if ((*cur >= '0') && (*cur <= '9'))
rawuuid[i] = *cur - '0';
else if ((*cur >= 'a') && (*cur <= 'f'))
rawuuid[i] = *cur - 'a' + 10;
else if ((*cur >= 'A') && (*cur <= 'F'))
rawuuid[i] = *cur - 'A' + 10;
else
goto error;
rawuuid[i] *= 16;
cur++;
if (*cur == 0)
goto error;
if ((*cur >= '0') && (*cur <= '9'))
rawuuid[i] += *cur - '0';
else if ((*cur >= 'a') && (*cur <= 'f'))
rawuuid[i] += *cur - 'a' + 10;
else if ((*cur >= 'A') && (*cur <= 'F'))
rawuuid[i] += *cur - 'A' + 10;
else
goto error;
i++;
cur++;
}
dst_uuid = (unsigned char *) *ptr;
*ptr += 16;
for (i = 0; i < 16; i++)
dst_uuid[i] = rawuuid[i] & 0xFF;
error:
return(dst_uuid);
}
/*
* Local variables:
* indent-tabs-mode: nil
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* End:
*/
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