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libvirt/src/xml.c
Karel Zak c613d7e162 cosmetic
2005-12-16 18:41:46 +00:00

487 lines
12 KiB
C
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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 "libvir.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <xs.h>
#include "internal.h"
#include "hash.h"
/**
* virBuffer:
*
* A buffer structure.
*/
typedef struct _virBuffer virBuffer;
typedef virBuffer *virBufferPtr;
struct _virBuffer {
char *content; /* The buffer content UTF8 */
unsigned int use; /* The buffer size used */
unsigned int size; /* The buffer size */
};
/**
* 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) {
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.
*/
static 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);
}
}
memmove(&buf->content[buf->use], str, len);
buf->use += len;
buf->content[buf->use] = 0;
return(0);
}
/**
* 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.
*/
static 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);
}
/**
* 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) {
struct xs_transaction_handle* t;
char s[256];
char *ret = NULL;
unsigned int len = 0;
snprintf(s, 255, "/local/domain/0/backend/%s/%d/%ld/%s",
sub, domain->handle, dev, name);
s[255] = 0;
t = xs_transaction_start(domain->conn->xshandle);
if (t == NULL)
goto done;
ret = xs_read(domain->conn->xshandle, t, &s[0], &len);
done:
if (t != NULL)
xs_transaction_end(domain->conn->xshandle, t, 0);
return(ret);
}
/**
* virDomainGetXMLDevice:
* @domain: a domain object
* @buf: the output buffer object
* @dev: the xenstrore internal device number
*
* Extract and dump in the buffer informations 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) {
virBufferVSprintf(buf, " <target dev='%s'/>\n", val);
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) {
virBufferVSprintf(buf, " <target dev='%s'/>\n", val);
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) {
struct xs_transaction_handle* t;
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;
t = xs_transaction_start(conn->xshandle);
if (t == NULL)
goto done;
snprintf(backend, 199, "/local/domain/0/backend/vbd/%d",
virDomainGetID(domain));
backend[199] = 0;
list = xs_directory(conn->xshandle, t, 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 (t != NULL)
xs_transaction_end(conn->xshandle, t, 0);
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 informations 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) {
struct xs_transaction_handle* t;
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;
t = xs_transaction_start(conn->xshandle);
if (t == NULL)
goto done;
snprintf(backend, 199, "/local/domain/0/backend/vif/%d",
virDomainGetID(domain));
backend[199] = 0;
list = xs_directory(conn->xshandle, t, 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 (t != NULL)
xs_transaction_end(conn->xshandle, t, 0);
if (list != NULL)
free(list);
return(ret);
}
/**
* virDomainGetXMLBoot:
* @domain: a domain object
* @buf: the output buffer object
*
* Extract the boot informations 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;
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));
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);
}
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