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libvirt/src/xml.c
Daniel Veillard fdc36dcbe6 * src/xml.c: patch from Masayuki Sunou fixing leaks in 
virDomainParseXMLDiskDesc
Daniel
2007-07-11 08:41:11 +00:00

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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>
#ifdef WITH_XEN
#include <xs.h>
#endif
#include <math.h> /* for isnan() */
#include "internal.h"
#include "hash.h"
#include "sexpr.h"
#include "xml.h"
#include "buf.h"
#include "xs_internal.h" /* for xenStoreDomainGetNetworkID */
#ifndef PROXY
/**
* virXMLError:
* @conn: a connection if any
* @error: the error number
* @info: information/format string
* @value: extra integer parameter for the error string
*
* Report an error coming from the XML module.
*/
static void
virXMLError(virConnectPtr conn, virErrorNumber error, const char *info, int value)
{
const char *errmsg;
if (error == VIR_ERR_OK)
return;
errmsg = __virErrorMsg(error, info);
__virRaiseError(conn, NULL, NULL, VIR_FROM_XML, error, VIR_ERR_ERROR,
errmsg, info, NULL, value, 0, errmsg, info, value);
}
/**
* virXPathString:
* @xpath: the XPath string to evaluate
* @ctxt: an XPath context
*
* Convenience function to evaluate an XPath string
*
* Returns a new string which must be deallocated by the caller or NULL
* if the evaluation failed.
*/
char *
virXPathString(const char *xpath, xmlXPathContextPtr ctxt) {
xmlXPathObjectPtr obj;
char *ret;
if ((ctxt == NULL) || (xpath == NULL)) {
virXMLError(NULL, VIR_ERR_INTERNAL_ERROR,
"Invalid parameter to virXPathString()", 0);
return(NULL);
}
obj = xmlXPathEval(BAD_CAST xpath, ctxt);
if ((obj == NULL) || (obj->type != XPATH_STRING) ||
(obj->stringval == NULL) || (obj->stringval[0] == 0))
return(NULL);
ret = strdup((char *) obj->stringval);
xmlXPathFreeObject(obj);
if (ret == NULL) {
virXMLError(NULL, VIR_ERR_NO_MEMORY, "strdup", 0);
}
return(ret);
}
/**
* virXPathNumber:
* @xpath: the XPath string to evaluate
* @ctxt: an XPath context
* @value: the returned double value
*
* Convenience function to evaluate an XPath number
*
* Returns 0 in case of success in which case @value is set,
* or -1 if the evaluation failed.
*/
int
virXPathNumber(const char *xpath, xmlXPathContextPtr ctxt, double *value) {
xmlXPathObjectPtr obj;
if ((ctxt == NULL) || (xpath == NULL) || (value == NULL)) {
virXMLError(NULL, VIR_ERR_INTERNAL_ERROR,
"Invalid parameter to virXPathNumber()", 0);
return(-1);
}
obj = xmlXPathEval(BAD_CAST xpath, ctxt);
if ((obj == NULL) || (obj->type != XPATH_NUMBER) ||
(isnan(obj->floatval))) {
xmlXPathFreeObject(obj);
return(-1);
}
*value = obj->floatval;
xmlXPathFreeObject(obj);
return(0);
}
/**
* virXPathLong:
* @xpath: the XPath string to evaluate
* @ctxt: an XPath context
* @value: the returned long value
*
* Convenience function to evaluate an XPath number
*
* Returns 0 in case of success in which case @value is set,
* or -1 if the XPath evaluation failed or -2 if the
* value doesn't have a long format.
*/
int
virXPathLong(const char *xpath, xmlXPathContextPtr ctxt, long *value) {
xmlXPathObjectPtr obj;
int ret = 0;
if ((ctxt == NULL) || (xpath == NULL) || (value == NULL)) {
virXMLError(NULL, VIR_ERR_INTERNAL_ERROR,
"Invalid parameter to virXPathNumber()", 0);
return(-1);
}
obj = xmlXPathEval(BAD_CAST xpath, ctxt);
if ((obj != NULL) && (obj->type == XPATH_STRING) &&
(obj->stringval != NULL) && (obj->stringval[0] != 0)) {
char *conv = NULL;
long val;
val = strtol((const char*)obj->stringval, &conv, 10);
if (conv == (const char*)obj->stringval) {
ret = -2;
} else {
*value = val;
}
} else if ((obj != NULL) && (obj->type == XPATH_NUMBER) &&
(!(isnan(obj->floatval)))) {
*value = (long) obj->floatval;
if (*value != obj->floatval) {
ret = -2;
}
} else {
ret = -1;
}
xmlXPathFreeObject(obj);
return(ret);
}
/**
* virXPathBoolean:
* @xpath: the XPath string to evaluate
* @ctxt: an XPath context
*
* Convenience function to evaluate an XPath boolean
*
* Returns 0 if false, 1 if true, or -1 if the evaluation failed.
*/
int
virXPathBoolean(const char *xpath, xmlXPathContextPtr ctxt) {
xmlXPathObjectPtr obj;
int ret;
if ((ctxt == NULL) || (xpath == NULL)) {
virXMLError(NULL, VIR_ERR_INTERNAL_ERROR,
"Invalid parameter to virXPathBoolean()", 0);
return(-1);
}
obj = xmlXPathEval(BAD_CAST xpath, ctxt);
if ((obj == NULL) || (obj->type != XPATH_BOOLEAN) ||
(obj->boolval < 0) || (obj->boolval > 1)) {
xmlXPathFreeObject(obj);
return(-1);
}
ret = obj->boolval;
xmlXPathFreeObject(obj);
return(ret);
}
/**
* virXPathNode:
* @xpath: the XPath string to evaluate
* @ctxt: an XPath context
*
* Convenience function to evaluate an XPath node set and returning
* only one node, the first one in the set if any
*
* Returns a pointer to the node or NULL if the evaluation failed.
*/
xmlNodePtr
virXPathNode(const char *xpath, xmlXPathContextPtr ctxt) {
xmlXPathObjectPtr obj;
xmlNodePtr ret;
if ((ctxt == NULL) || (xpath == NULL)) {
virXMLError(NULL, VIR_ERR_INTERNAL_ERROR,
"Invalid parameter to virXPathNode()", 0);
return(NULL);
}
obj = xmlXPathEval(BAD_CAST xpath, ctxt);
if ((obj == NULL) || (obj->type != XPATH_NODESET) ||
(obj->nodesetval == NULL) || (obj->nodesetval->nodeNr <= 0) ||
(obj->nodesetval->nodeTab == NULL)) {
xmlXPathFreeObject(obj);
return(NULL);
}
ret = obj->nodesetval->nodeTab[0];
xmlXPathFreeObject(obj);
return(ret);
}
/**
* virXPathNodeSet:
* @xpath: the XPath string to evaluate
* @ctxt: an XPath context
* @list: the returned list of nodes (or NULL if only count matters)
*
* Convenience function to evaluate an XPath node set
*
* Returns the number of nodes found in which case @list is set (and
* must be freed) or -1 if the evaluation failed.
*/
int
virXPathNodeSet(const char *xpath, xmlXPathContextPtr ctxt, xmlNodePtr **list) {
xmlXPathObjectPtr obj;
int ret;
if ((ctxt == NULL) || (xpath == NULL)) {
virXMLError(NULL, VIR_ERR_INTERNAL_ERROR,
"Invalid parameter to virXPathNodeSet()", 0);
return(-1);
}
obj = xmlXPathEval(BAD_CAST xpath, ctxt);
if ((obj == NULL) || (obj->type != XPATH_NODESET) ||
(obj->nodesetval == NULL) || (obj->nodesetval->nodeNr <= 0) ||
(obj->nodesetval->nodeTab == NULL)) {
xmlXPathFreeObject(obj);
if (list != NULL)
*list = NULL;
return(-1);
}
ret = obj->nodesetval->nodeNr;
if (list != NULL) {
*list = malloc(ret * sizeof(xmlNodePtr));
if (*list == NULL) {
virXMLError(NULL, VIR_ERR_NO_MEMORY,
_("allocate string array"), ret * sizeof(xmlNodePtr));
} else {
memcpy(*list, obj->nodesetval->nodeTab, ret * sizeof(xmlNodePtr));
}
}
xmlXPathFreeObject(obj);
return(ret);
}
/**
* virtDomainParseXMLGraphicsDescImage:
* @conn: pointer to the hypervisor connection
* @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 virDomainParseXMLGraphicsDescImage(virConnectPtr conn ATTRIBUTE_UNUSED, 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");
xmlChar *vnclisten = xmlGetProp(node, BAD_CAST "listen");
xmlChar *vncpasswd = xmlGetProp(node, BAD_CAST "passwd");
xmlChar *keymap = xmlGetProp(node, BAD_CAST "keymap");
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 %ld)", port - 5900);
xmlFree(vncport);
}
if (vnclisten != NULL) {
virBufferVSprintf(buf, "(vnclisten %s)", vnclisten);
xmlFree(vnclisten);
}
if (vncpasswd != NULL) {
virBufferVSprintf(buf, "(vncpasswd %s)", vncpasswd);
xmlFree(vncpasswd);
}
if (keymap != NULL) {
virBufferVSprintf(buf, "(keymap %s)", keymap);
xmlFree(keymap);
}
}
}
xmlFree(graphics_type);
}
return 0;
}
/**
* virtDomainParseXMLGraphicsDescVFB:
* @conn: pointer to the hypervisor connection
* @node: node containing graphics description
* @buf: a buffer for the result S-Expr
*
* 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 virDomainParseXMLGraphicsDescVFB(virConnectPtr conn ATTRIBUTE_UNUSED, xmlNodePtr node, virBufferPtr buf)
{
xmlChar *graphics_type = NULL;
graphics_type = xmlGetProp(node, BAD_CAST "type");
if (graphics_type != NULL) {
virBufferAdd(buf, "(device (vkbd))", 15);
virBufferAdd(buf, "(device (vfb ", 13);
if (xmlStrEqual(graphics_type, BAD_CAST "sdl")) {
virBufferAdd(buf, "(type sdl)", 10);
/* 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, "(type vnc)", 10);
xmlChar *vncport = xmlGetProp(node, BAD_CAST "port");
xmlChar *vnclisten = xmlGetProp(node, BAD_CAST "listen");
xmlChar *vncpasswd = xmlGetProp(node, BAD_CAST "passwd");
xmlChar *keymap = xmlGetProp(node, BAD_CAST "keymap");
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 %ld)", port - 5900);
xmlFree(vncport);
}
if (vnclisten != NULL) {
virBufferVSprintf(buf, "(vnclisten %s)", vnclisten);
xmlFree(vnclisten);
}
if (vncpasswd != NULL) {
virBufferVSprintf(buf, "(vncpasswd %s)", vncpasswd);
xmlFree(vncpasswd);
}
if (keymap != NULL) {
virBufferVSprintf(buf, "(keymap %s)", keymap);
xmlFree(keymap);
}
}
virBufferAdd(buf, "))", 2);
xmlFree(graphics_type);
}
return 0;
}
/**
* virDomainParseXMLOSDescHVM:
* @conn: pointer to the hypervisor connection
* @node: node containing HVM OS description
* @buf: a buffer for the result S-Expr
* @ctxt: a path context representing the XML description
* @vcpus: number of virtual CPUs to configure
* @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(virConnectPtr conn, xmlNodePtr node, virBufferPtr buf, xmlXPathContextPtr ctxt, int vcpus, int xendConfigVersion)
{
xmlNodePtr cur, txt;
xmlChar *type = NULL;
xmlChar *loader = NULL;
char bootorder[5];
int nbootorder = 0;
int res;
char *str;
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 ((xmlStrEqual(cur->name, BAD_CAST "boot"))) {
xmlChar *boot_dev = xmlGetProp(cur, BAD_CAST "dev");
if (nbootorder == ((sizeof(bootorder)/sizeof(bootorder[0]))-1)) {
virXMLError(conn, VIR_ERR_XML_ERROR, "too many boot devices", 0);
return (-1);
}
if (xmlStrEqual(boot_dev, BAD_CAST "fd")) {
bootorder[nbootorder++] = 'a';
} else if (xmlStrEqual(boot_dev, BAD_CAST "cdrom")) {
bootorder[nbootorder++] = 'd';
} else if (xmlStrEqual(boot_dev, BAD_CAST "network")) {
bootorder[nbootorder++] = 'n';
} else if (xmlStrEqual(boot_dev, BAD_CAST "hd")) {
bootorder[nbootorder++] = 'c';
} else {
xmlFree(boot_dev);
/* Any other type of boot dev is unsupported right now */
virXMLError(conn, VIR_ERR_XML_ERROR, NULL, 0);
return (-1);
}
xmlFree(boot_dev);
}
}
cur = cur->next;
}
bootorder[nbootorder] = '\0';
if ((type == NULL) || (!xmlStrEqual(type, BAD_CAST "hvm"))) {
/* VIR_ERR_OS_TYPE */
virXMLError(conn, VIR_ERR_OS_TYPE, (const char *) type, 0);
return (-1);
}
virBufferAdd(buf, "(image (hvm ", 12);
if (loader == NULL) {
virXMLError(conn, VIR_ERR_NO_KERNEL, NULL, 0);
goto error;
} else {
virBufferVSprintf(buf, "(kernel '%s')", (const char *) loader);
}
/* get the device emulation model */
str = virXPathString("string(/domain/devices/emulator[1])", ctxt);
if (str == NULL) {
virXMLError(conn, VIR_ERR_NO_KERNEL, NULL, 0); /* TODO: error */
goto error;
}
virBufferVSprintf(buf, "(device_model '%s')", str);
xmlFree(str);
virBufferVSprintf(buf, "(vcpus %d)", vcpus);
if (nbootorder)
virBufferVSprintf(buf, "(boot %s)", bootorder);
/* get the 1st floppy device file */
cur = virXPathNode("/domain/devices/disk[@device='floppy' and target/@dev='fda']/source",
ctxt);
if (cur != NULL) {
xmlChar *fdfile;
fdfile = xmlGetProp(cur, BAD_CAST "file");
if (fdfile != NULL) {
virBufferVSprintf(buf, "(fda '%s')", fdfile);
free(fdfile);
}
}
/* get the 2nd floppy device file */
cur = virXPathNode("/domain/devices/disk[@device='floppy' and target/@dev='fdb']/source",
ctxt);
if (cur != NULL) {
xmlChar *fdfile;
fdfile = xmlGetProp(cur, BAD_CAST "file");
if (fdfile != NULL) {
virBufferVSprintf(buf, "(fdb '%s')", fdfile);
free(fdfile);
}
}
/* get the cdrom device file */
/* Only XenD <= 3.0.2 wants cdrom config here */
if (xendConfigVersion == 1) {
cur = virXPathNode("/domain/devices/disk[@device='cdrom' and target/@dev='hdc']/source",
ctxt);
if (cur != NULL) {
xmlChar *cdfile;
cdfile = xmlGetProp(cur, BAD_CAST "file");
if (cdfile != NULL) {
virBufferVSprintf(buf, "(cdrom '%s')",
(const char *)cdfile);
xmlFree(cdfile);
}
}
}
if (virXPathNode("/domain/features/acpi", ctxt) != NULL)
virBufferAdd(buf, "(acpi 1)", 8);
if (virXPathNode("/domain/features/apic", ctxt) != NULL)
virBufferAdd(buf, "(apic 1)", 8);
if (virXPathNode("/domain/features/pae", ctxt) != NULL)
virBufferAdd(buf, "(pae 1)", 7);
res = virXPathBoolean("count(domain/devices/console) > 0", ctxt);
if (res < 0) {
virXMLError(conn, VIR_ERR_XML_ERROR, NULL, 0);
goto error;
}
if (res) {
virBufferAdd(buf, "(serial pty)", 12);
}
/* HVM graphics for xen <= 3.0.5 */
if (xendConfigVersion < 4) {
/* Is a graphics device specified? */
cur = virXPathNode("/domain/devices/graphics[1]", ctxt);
if (cur != NULL) {
res = virDomainParseXMLGraphicsDescImage(conn, cur, buf,
xendConfigVersion);
if (res != 0) {
goto error;
}
}
}
virBufferAdd(buf, "))", 2);
return (0);
error:
return(-1);
}
/**
* virDomainParseXMLOSDescPV:
* @conn: pointer to the hypervisor connection
* @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(virConnectPtr conn, xmlNodePtr node, virBufferPtr buf, xmlXPathContextPtr ctxt, int xendConfigVersion)
{
xmlNodePtr cur, txt;
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(conn, VIR_ERR_OS_TYPE, (const char *) type, 0);
return (-1);
}
virBufferAdd(buf, "(image (linux ", 14);
if (kernel == NULL) {
virXMLError(conn, 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);
/* PV graphics for xen <= 3.0.4 */
if (xendConfigVersion < 3) {
cur = virXPathNode("/domain/devices/graphics[1]", ctxt);
if (cur != NULL) {
res = virDomainParseXMLGraphicsDescImage(conn, cur, buf,
xendConfigVersion);
if (res != 0) {
goto error;
}
}
}
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 ATTRIBUTE_UNUSED, ...) {
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
if ((ctxt != NULL) &&
(ctxt->lastError.level == XML_ERR_FATAL) &&
(ctxt->lastError.message != NULL)) {
virXMLError(NULL, VIR_ERR_XML_DETAIL, ctxt->lastError.message,
ctxt->lastError.line);
}
}
/**
* virDomainParseXMLDiskDesc:
* @node: node containing disk description
* @conn: pointer to the hypervisor connection
* @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(virConnectPtr conn, 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 shareable = 0;
int typ = 0;
int cdrom = 0;
int isNoSrcCdrom = 0;
int ret = 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;
} else if (xmlStrEqual(cur->name, BAD_CAST "shareable")) {
shareable = 1;
}
}
cur = cur->next;
}
if (source == NULL) {
/* There is a case without the source
* to the CD-ROM device
*/
if (hvm &&
device &&
!strcmp((const char *)device, "cdrom")) {
isNoSrcCdrom = 1;
}
if (!isNoSrcCdrom) {
virXMLError(conn, VIR_ERR_NO_SOURCE, (const char *) target, 0);
ret = -1;
goto cleanup;
}
}
if (target == NULL) {
virXMLError(conn, VIR_ERR_NO_TARGET, (const char *) source, 0);
ret = -1;
goto cleanup;
}
/* 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 && !isNoSrcCdrom) {
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 (!isNoSrcCdrom) {
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 == 1)
virBufferVSprintf(buf, "(mode 'r')");
else if (shareable == 1)
virBufferVSprintf(buf, "(mode 'w!')");
else
virBufferVSprintf(buf, "(mode 'w')");
virBufferAdd(buf, ")", 1);
virBufferAdd(buf, ")", 1);
cleanup:
if(drvType)
xmlFree(drvType);
if(drvName)
xmlFree(drvName);
if(device)
xmlFree(device);
if(target)
xmlFree(target);
if(source)
xmlFree(source);
return (ret);
}
/**
* virDomainParseXMLIfDesc:
* @conn: pointer to the hypervisor connection
* @node: node containing the interface description
* @buf: a buffer for the result S-Expr
* @xendConfigVersion: xend configuration file format
*
* 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(virConnectPtr conn ATTRIBUTE_UNUSED, xmlNodePtr node, virBufferPtr buf, int hvm, int xendConfigVersion)
{
xmlNodePtr cur;
xmlChar *type = NULL;
xmlChar *source = NULL;
xmlChar *mac = NULL;
xmlChar *script = NULL;
xmlChar *ip = NULL;
int typ = 0;
int ret = -1;
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;
else if (xmlStrEqual(type, BAD_CAST "network"))
typ = 2;
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 if (typ == 1)
source = xmlGetProp(cur, BAD_CAST "dev");
else
source = xmlGetProp(cur, BAD_CAST "network");
} 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");
} else if ((ip == NULL) &&
(xmlStrEqual(cur->name, BAD_CAST "ip"))) {
/* XXX in future expect to need to have > 1 ip
address element - eg ipv4 & ipv6. For now
xen only supports a single address though
so lets ignore that complication */
ip = xmlGetProp(cur, BAD_CAST "address");
}
}
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 if (typ == 1) /* TODO does that work like that ? */
virBufferVSprintf(buf, "(dev '%s')", (const char *) source);
else {
virNetworkPtr network = virNetworkLookupByName(conn, (const char *) source);
char *bridge;
if (!network || !(bridge = virNetworkGetBridgeName(network))) {
virXMLError(conn, VIR_ERR_NO_SOURCE, (const char *) source, 0);
goto error;
}
virBufferVSprintf(buf, "(bridge '%s')", bridge);
free(bridge);
}
}
if (script != NULL)
virBufferVSprintf(buf, "(script '%s')", script);
if (ip != NULL)
virBufferVSprintf(buf, "(ip '%s')", ip);
/*
* apparently (type ioemu) breaks paravirt drivers on HVM so skip this
* from Xen 3.1.0
*/
if ((hvm) && (xendConfigVersion < 4))
virBufferAdd(buf, "(type ioemu)", 12);
virBufferAdd(buf, ")", 1);
ret = 0;
error:
if (mac != NULL)
xmlFree(mac);
if (source != NULL)
xmlFree(source);
if (script != NULL)
xmlFree(script);
if (ip != NULL)
xmlFree(ip);
return (ret);
}
/**
* virDomainParseXMLDesc:
* @conn: pointer to the hypervisor connection
* @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(virConnectPtr conn, const char *xmldesc, char **name, int xendConfigVersion)
{
xmlDocPtr xml = NULL;
xmlNodePtr node;
char *nam = NULL;
virBuffer buf;
xmlChar *prop;
xmlParserCtxtPtr pctxt;
xmlXPathContextPtr ctxt = NULL;
int i, res;
int bootloader = 0;
int hvm = 0;
unsigned int vcpus = 1;
unsigned long mem = 0, max_mem = 0;
char *str;
double f;
xmlNodePtr *nodes;
int nb_nodes;
if (name != NULL)
*name = NULL;
buf.content = malloc(1000);
if (buf.content == NULL)
return (NULL);
buf.size = 1000;
buf.use = 0;
pctxt = xmlNewParserCtxt();
if ((pctxt == NULL) || (pctxt->sax == NULL)) {
goto error;
}
/* TODO pass the connection point to the error handler:
* pctxt->userData = virConnectPtr;
*/
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 ...
*/
nam = virXPathString("string(/domain/name[1])", ctxt);
if (nam == NULL) {
virXMLError(conn, VIR_ERR_NO_NAME, xmldesc, 0);
goto error;
}
virBufferVSprintf(&buf, "(name '%s')", nam);
if ((virXPathNumber("number(/domain/memory[1])", ctxt, &f) < 0) ||
(f < MIN_XEN_GUEST_SIZE * 1024)) {
max_mem = 128;
} else {
max_mem = (f / 1024);
}
if ((virXPathNumber("number(/domain/currentMemory[1])", ctxt, &f) < 0) ||
(f < MIN_XEN_GUEST_SIZE * 1024)) {
mem = max_mem;
} else {
mem = (f / 1024);
if (mem > max_mem) {
max_mem = mem;
}
}
virBufferVSprintf(&buf, "(memory %lu)(maxmem %lu)", mem, max_mem);
if ((virXPathNumber("number(/domain/vcpu[1])", ctxt, &f) == 0) &&
(f > 0)) {
vcpus = (unsigned int) f;
}
virBufferVSprintf(&buf, "(vcpus %u)", vcpus);
str = virXPathString("string(/domain/uuid[1])", ctxt);
if (str != NULL) {
virBufferVSprintf(&buf, "(uuid '%s')", str);
free(str);
}
str = virXPathString("string(/domain/bootloader[1])", ctxt);
if (str != NULL) {
virBufferVSprintf(&buf, "(bootloader '%s')", str);
/*
* if using a bootloader, the kernel and initrd strings are not
* significant and should be discarded
*/
bootloader = 1;
free(str);
}
str = virXPathString("string(/domain/bootloader_args[1])", ctxt);
if (str != NULL && bootloader) {
/*
* ignore the bootloader_args value unless a bootloader was specified
*/
virBufferVSprintf(&buf, "(bootloader_args '%s')", str);
free(str);
}
str = virXPathString("string(/domain/on_poweroff[1])", ctxt);
if (str != NULL) {
virBufferVSprintf(&buf, "(on_poweroff '%s')", str);
free(str);
}
str = virXPathString("string(/domain/on_reboot[1])", ctxt);
if (str != NULL) {
virBufferVSprintf(&buf, "(on_reboot '%s')", str);
free(str);
}
str = virXPathString("string(/domain/on_crash[1])", ctxt);
if (str != NULL) {
virBufferVSprintf(&buf, "(on_crash '%s')", str);
free(str);
}
if (!bootloader) {
if ((node = virXPathNode("/domain/os[1]", ctxt)) != NULL) {
/* Analyze of the os description, based on HVM or PV. */
str = virXPathString("string(/domain/os/type[1])", ctxt);
if ((str == NULL) || (strcmp(str, "hvm"))) {
res = virDomainParseXMLOSDescPV(conn, node,
&buf, ctxt, xendConfigVersion);
} else {
hvm = 1;
res = virDomainParseXMLOSDescHVM(conn, node, &buf, ctxt,
vcpus, xendConfigVersion);
}
if (str != NULL) free(str);
if (res != 0)
goto error;
} else {
virXMLError(conn, VIR_ERR_NO_OS, nam, 0);
goto error;
}
}
/* analyze of the devices */
nb_nodes = virXPathNodeSet("/domain/devices/disk", ctxt, &nodes);
if (nb_nodes > 0) {
for (i = 0; i < nb_nodes; i++) {
res = virDomainParseXMLDiskDesc(conn, nodes[i], &buf,
hvm, xendConfigVersion);
if (res != 0) {
free(nodes);
goto error;
}
}
free(nodes);
}
nb_nodes = virXPathNodeSet("/domain/devices/interface", ctxt, &nodes);
if (nb_nodes > 0) {
for (i = 0; i < nb_nodes; i++) {
virBufferAdd(&buf, "(device ", 8);
res = virDomainParseXMLIfDesc(conn, nodes[i], &buf, hvm, xendConfigVersion);
if (res != 0) {
free(nodes);
goto error;
}
virBufferAdd(&buf, ")", 1);
}
free(nodes);
}
/* New style PV graphics config xen >= 3.0.4,
* or HVM graphics config xen >= 3.0.5 */
if ((xendConfigVersion >= 3 && !hvm) ||
(xendConfigVersion >= 4 && hvm)) {
nb_nodes = virXPathNodeSet("/domain/devices/graphics", ctxt, &nodes);
if (nb_nodes > 0) {
for (i = 0; i < nb_nodes; i++) {
res = virDomainParseXMLGraphicsDescVFB(conn, nodes[i], &buf);
if (res != 0) {
free(nodes);
goto error;
}
}
free(nodes);
}
}
virBufferAdd(&buf, ")", 1); /* closes (vm */
buf.content[buf.use] = 0;
xmlXPathFreeContext(ctxt);
xmlFreeDoc(xml);
xmlFreeParserCtxt(pctxt);
if (name != NULL)
*name = nam;
else
free(nam);
return (buf.content);
error:
if (nam != NULL)
free(nam);
if (name != NULL)
*name = NULL;
if (ctxt != NULL)
xmlXPathFreeContext(ctxt);
if (xml != NULL)
xmlFreeDoc(xml);
if (pctxt != NULL)
xmlFreeParserCtxt(pctxt);
if (buf.content != NULL)
free(buf.content);
return (NULL);
}
#endif /* !PROXY */
unsigned char *virParseUUID(char **ptr, const char *uuid) {
int rawuuid[VIR_UUID_BUFLEN];
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 < VIR_UUID_BUFLEN;) {
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 < VIR_UUID_BUFLEN; i++)
dst_uuid[i] = rawuuid[i] & 0xFF;
error:
return(dst_uuid);
}
#ifndef PROXY
/**
* virParseXMLDevice:
* @conn: pointer to the hypervisor connection
* @xmldesc: string with the XML description
* @hvm: 1 for fully virtualized guest, 0 for paravirtualized
* @xendConfigVersion: xend configuration file format
*
* Parse the XML description and turn it into the xend sexp needed to
* create the device. 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-terminated S-Expr string, or NULL in case of error.
* the caller must free() the returned value.
*/
char *
virParseXMLDevice(virConnectPtr conn, char *xmldesc, int hvm, int xendConfigVersion)
{
xmlDocPtr xml = NULL;
xmlNodePtr node;
virBuffer buf;
buf.content = malloc(1000);
if (buf.content == NULL)
return (NULL);
buf.size = 1000;
buf.use = 0;
buf.content[0] = 0;
xml = xmlReadDoc((const xmlChar *) xmldesc, "domain.xml", NULL,
XML_PARSE_NOENT | XML_PARSE_NONET |
XML_PARSE_NOERROR | XML_PARSE_NOWARNING);
if (xml == NULL)
goto error;
node = xmlDocGetRootElement(xml);
if (node == NULL)
goto error;
if (xmlStrEqual(node->name, BAD_CAST "disk")) {
if (virDomainParseXMLDiskDesc(conn, node, &buf, hvm, xendConfigVersion) != 0)
goto error;
/* SXP is not created when device is "floppy". */
else if (buf.use == 0)
goto error;
}
else if (xmlStrEqual(node->name, BAD_CAST "interface")) {
if (virDomainParseXMLIfDesc(conn, node, &buf, hvm, xendConfigVersion) != 0)
goto error;
}
cleanup:
if (xml != NULL)
xmlFreeDoc(xml);
return buf.content;
error:
free(buf.content);
buf.content = NULL;
goto cleanup;
}
/**
* virDomainXMLDevID:
* @domain: pointer to domain object
* @xmldesc: string with the XML description
* @class: Xen device class "vbd" or "vif" (OUT)
* @ref: Xen device reference (OUT)
*
* Set class according to XML root, and:
* - if disk, copy in ref the target name from description
* - if network, get MAC address from description, scan XenStore and
* copy in ref the corresponding vif number.
*
* Returns 0 in case of success, -1 in case of failure.
*/
int
virDomainXMLDevID(virDomainPtr domain, char *xmldesc, char *class, char *ref)
{
xmlDocPtr xml = NULL;
xmlNodePtr node, cur;
xmlChar *attr = NULL;
#ifdef WITH_XEN
char *xref;
#endif /* WITH_XEN */
int ret = 0;
xml = xmlReadDoc((const xmlChar *) xmldesc, "domain.xml", NULL,
XML_PARSE_NOENT | XML_PARSE_NONET |
XML_PARSE_NOERROR | XML_PARSE_NOWARNING);
if (xml == NULL)
goto error;
node = xmlDocGetRootElement(xml);
if (node == NULL)
goto error;
if (xmlStrEqual(node->name, BAD_CAST "disk")) {
strcpy(class, "vbd");
for (cur = node->children; cur != NULL; cur = cur->next) {
if ((cur->type != XML_ELEMENT_NODE) ||
(!xmlStrEqual(cur->name, BAD_CAST "target"))) continue;
attr = xmlGetProp(cur, BAD_CAST "dev");
if (attr == NULL)
goto error;
strcpy(ref, (char *)attr);
goto cleanup;
}
}
else if (xmlStrEqual(node->name, BAD_CAST "interface")) {
strcpy(class, "vif");
for (cur = node->children; cur != NULL; cur = cur->next) {
if ((cur->type != XML_ELEMENT_NODE) ||
(!xmlStrEqual(cur->name, BAD_CAST "mac"))) continue;
attr = xmlGetProp(cur, BAD_CAST "address");
if (attr == NULL)
goto error;
#ifdef WITH_XEN
xref = xenStoreDomainGetNetworkID(domain->conn, domain->id,
(char *) attr);
if (xref != NULL) {
strcpy(ref, xref);
free(xref);
goto cleanup;
}
#else /* without xen */
/* hack to avoid the warning that domain is unused */
if (domain->id < 0)
ret = -1;
#endif /* WITH_XEN */
goto error;
}
}
error:
ret = -1;
cleanup:
if (xml != NULL)
xmlFreeDoc(xml);
if (attr != NULL)
xmlFree(attr);
return ret;
}
#endif /* !PROXY */
/*
* Local variables:
* indent-tabs-mode: nil
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* End:
*/
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