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xend: Escape reserved sexpr characters

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If we don't escape ' or \ xend can't parse the generated sexpr. This
might over apply the EscapeSexpr routine, but it shouldn't hurt.
This commit is contained in:
Cole Robinson 2010-11-19 10:51:57 -05:00
parent 0af02cb2e8
commit 3afe5d402b
7 changed files with 146 additions and 51 deletions
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1
src/libvirt_private.syms
View File

@ -24,6 +24,7 @@ virBufferAddChar;
virBufferContentAndReset;
virBufferError;
virBufferEscapeString;
virBufferEscapeSexpr;
virBufferFreeAndReset;
virBufferStrcat;
virBufferURIEncodeString;

55
src/util/buf.c
View File

@ -354,6 +354,61 @@ virBufferEscapeString(const virBufferPtr buf, const char *format, const char *st
VIR_FREE(escaped);
}
/**
* virBufferEscapeSexpr:
* @buf: the buffer to dump
* @format: a printf like format string but with only one %s parameter
* @str: the string argument which need to be escaped
*
* Do a formatted print with a single string to an sexpr buffer. The string
* is escaped to avoid generating a sexpr that xen will choke on. This
* doesn't fully escape the sexpr, just enough for our code to work.
*/
void
virBufferEscapeSexpr(const virBufferPtr buf,
const char *format,
const char *str)
{
int len;
char *escaped, *out;
const char *cur;
if ((format == NULL) || (buf == NULL) || (str == NULL))
return;
if (buf->error)
return;
len = strlen(str);
if (strcspn(str, "\\'") == len) {
virBufferVSprintf(buf, format, str);
return;
}
if (VIR_ALLOC_N(escaped, 2 * len + 1) < 0) {
virBufferNoMemory(buf);
return;
}
cur = str;
out = escaped;
while (*cur != 0) {
switch (*cur) {
case '\\':
case '\'':
*out++ = '\\';
/* fallthrough */
default:
*out++ = *cur;
}
cur++;
}
*out = 0;
virBufferVSprintf(buf, format, escaped);
VIR_FREE(escaped);
}
/**
* virBufferURIEncodeString:
* @buf: the buffer to append to

1
src/util/buf.h
View File

@ -45,6 +45,7 @@ void virBufferVSprintf(const virBufferPtr buf, const char *format, ...)
void virBufferStrcat(const virBufferPtr buf, ...)
ATTRIBUTE_SENTINEL;
void virBufferEscapeString(const virBufferPtr buf, const char *format, const char *str);
void virBufferEscapeSexpr(const virBufferPtr buf, const char *format, const char *str);
void virBufferURIEncodeString (const virBufferPtr buf, const char *str);
# define virBufferAddLit(buf_, literal_string_) \

114
src/xen/xend_internal.c
View File

@ -522,6 +522,7 @@ xend_op_ext(virConnectPtr xend, const char *path, const char *key, va_list ap)
}
content = virBufferContentAndReset(&buf);
DEBUG("xend op: %s\n", content);
ret = http2unix(xend_post(xend, path, content));
VIR_FREE(content);
@ -4605,8 +4606,6 @@ virDomainPtr xenDaemonDomainDefineXML(virConnectPtr conn, const char *xmlDesc) {
goto error;
}
DEBUG("Defining w/ sexpr: \n%s", sexpr);
ret = xend_op(conn, "", "op", "new", "config", sexpr, NULL);
VIR_FREE(sexpr);
if (ret != 0) {
@ -5297,11 +5296,12 @@ xenDaemonFormatSxprChr(virDomainChrDefPtr def,
case VIR_DOMAIN_CHR_TYPE_FILE:
case VIR_DOMAIN_CHR_TYPE_PIPE:
virBufferVSprintf(buf, "%s:%s", type, def->data.file.path);
virBufferVSprintf(buf, "%s:", type);
virBufferEscapeSexpr(buf, "%s", def->data.file.path);
break;
case VIR_DOMAIN_CHR_TYPE_DEV:
virBufferVSprintf(buf, "%s", def->data.file.path);
virBufferEscapeSexpr(buf, "%s", def->data.file.path);
break;
case VIR_DOMAIN_CHR_TYPE_TCP:
@ -5322,9 +5322,10 @@ xenDaemonFormatSxprChr(virDomainChrDefPtr def,
break;
case VIR_DOMAIN_CHR_TYPE_UNIX:
virBufferVSprintf(buf, "%s:%s%s", type,
def->data.nix.path,
def->data.nix.listen ? ",server,nowait" : "");
virBufferVSprintf(buf, "%s:", type);
virBufferEscapeSexpr(buf, "%s", def->data.nix.path);
if (def->data.nix.listen)
virBufferAddLit(buf, ",server,nowait");
break;
}
@ -5400,39 +5401,42 @@ xenDaemonFormatSxprDisk(virConnectPtr conn ATTRIBUTE_UNUSED,
if (hvm) {
/* Xend <= 3.0.2 wants a ioemu: prefix on devices for HVM */
if (xendConfigVersion == 1)
virBufferVSprintf(buf, "(dev 'ioemu:%s')", def->dst);
else /* But newer does not */
virBufferVSprintf(buf, "(dev '%s:%s')", def->dst,
if (xendConfigVersion == 1) {
virBufferEscapeSexpr(buf, "(dev 'ioemu:%s')", def->dst);
} else {
/* But newer does not */
virBufferEscapeSexpr(buf, "(dev '%s:", def->dst);
virBufferVSprintf(buf, "%s')",
def->device == VIR_DOMAIN_DISK_DEVICE_CDROM ?
"cdrom" : "disk");
}
} else if (def->device == VIR_DOMAIN_DISK_DEVICE_CDROM) {
virBufferVSprintf(buf, "(dev '%s:cdrom')", def->dst);
virBufferEscapeSexpr(buf, "(dev '%s:cdrom')", def->dst);
} else {
virBufferVSprintf(buf, "(dev '%s')", def->dst);
virBufferEscapeSexpr(buf, "(dev '%s')", def->dst);
}
if (def->src) {
if (def->driverName) {
if (STREQ(def->driverName, "tap") ||
STREQ(def->driverName, "tap2")) {
virBufferVSprintf(buf, "(uname '%s:%s:%s')",
def->driverName,
def->driverType ? def->driverType : "aio",
def->src);
virBufferEscapeSexpr(buf, "(uname '%s:", def->driverName);
virBufferEscapeSexpr(buf, "%s:",
def->driverType ? def->driverType : "aio");
virBufferEscapeSexpr(buf, "%s')", def->src);
} else {
virBufferVSprintf(buf, "(uname '%s:%s')",
def->driverName,
def->src);
virBufferEscapeSexpr(buf, "(uname '%s:", def->driverName);
virBufferEscapeSexpr(buf, "%s')", def->src);
}
} else {
if (def->type == VIR_DOMAIN_DISK_TYPE_FILE) {
virBufferVSprintf(buf, "(uname 'file:%s')", def->src);
virBufferEscapeSexpr(buf, "(uname 'file:%s')", def->src);
} else if (def->type == VIR_DOMAIN_DISK_TYPE_BLOCK) {
if (def->src[0] == '/')
virBufferVSprintf(buf, "(uname 'phy:%s')", def->src);
virBufferEscapeSexpr(buf, "(uname 'phy:%s')", def->src);
else
virBufferVSprintf(buf, "(uname 'phy:/dev/%s')", def->src);
virBufferEscapeSexpr(buf, "(uname 'phy:/dev/%s')",
def->src);
} else {
virXendError(VIR_ERR_CONFIG_UNSUPPORTED,
_("unsupported disk type %s"),
@ -5501,13 +5505,13 @@ xenDaemonFormatSxprNet(virConnectPtr conn,
switch (def->type) {
case VIR_DOMAIN_NET_TYPE_BRIDGE:
virBufferVSprintf(buf, "(bridge '%s')", def->data.bridge.brname);
virBufferEscapeSexpr(buf, "(bridge '%s')", def->data.bridge.brname);
if (def->data.bridge.script)
script = def->data.bridge.script;
virBufferVSprintf(buf, "(script '%s')", script);
virBufferEscapeSexpr(buf, "(script '%s')", script);
if (def->data.bridge.ipaddr != NULL)
virBufferVSprintf(buf, "(ip '%s')", def->data.bridge.ipaddr);
virBufferEscapeSexpr(buf, "(ip '%s')", def->data.bridge.ipaddr);
break;
case VIR_DOMAIN_NET_TYPE_NETWORK:
@ -5530,17 +5534,18 @@ xenDaemonFormatSxprNet(virConnectPtr conn,
def->data.network.name);
return -1;
}
virBufferVSprintf(buf, "(bridge '%s')", bridge);
virBufferVSprintf(buf, "(script '%s')", script);
virBufferEscapeSexpr(buf, "(bridge '%s')", bridge);
virBufferEscapeSexpr(buf, "(script '%s')", script);
VIR_FREE(bridge);
}
break;
case VIR_DOMAIN_NET_TYPE_ETHERNET:
if (def->data.ethernet.script)
virBufferVSprintf(buf, "(script '%s')", def->data.ethernet.script);
virBufferEscapeSexpr(buf, "(script '%s')",
def->data.ethernet.script);
if (def->data.ethernet.ipaddr != NULL)
virBufferVSprintf(buf, "(ip '%s')", def->data.ethernet.ipaddr);
virBufferEscapeSexpr(buf, "(ip '%s')", def->data.ethernet.ipaddr);
break;
case VIR_DOMAIN_NET_TYPE_USER:
@ -5555,11 +5560,11 @@ xenDaemonFormatSxprNet(virConnectPtr conn,
if (def->ifname != NULL &&
!STRPREFIX(def->ifname, "vif"))
virBufferVSprintf(buf, "(vifname '%s')", def->ifname);
virBufferEscapeSexpr(buf, "(vifname '%s')", def->ifname);
if (!hvm) {
if (def->model != NULL)
virBufferVSprintf(buf, "(model '%s')", def->model);
virBufferEscapeSexpr(buf, "(model '%s')", def->model);
}
else if (def->model == NULL) {
/*
@ -5573,7 +5578,7 @@ xenDaemonFormatSxprNet(virConnectPtr conn,
virBufferAddLit(buf, "(type netfront)");
}
else {
virBufferVSprintf(buf, "(model '%s')", def->model);
virBufferEscapeSexpr(buf, "(model '%s')", def->model);
virBufferAddLit(buf, "(type ioemu)");
}
@ -5680,7 +5685,9 @@ xenDaemonFormatSxprSound(virDomainDefPtr def,
def->sounds[i]->model);
return -1;
}
virBufferVSprintf(buf, "%s%s", i ? "," : "", str);
if (i)
virBufferAddChar(buf, ',');
virBufferEscapeSexpr(buf, "%s", str);
}
if (virBufferError(buf)) {
@ -5737,10 +5744,13 @@ xenDaemonFormatSxpr(virConnectPtr conn,
virBuffer buf = VIR_BUFFER_INITIALIZER;
char uuidstr[VIR_UUID_STRING_BUFLEN];
const char *tmp;
char *bufout;
int hvm = 0, i;
DEBUG0("Formatting domain sexpr");
virBufferAddLit(&buf, "(vm ");
virBufferVSprintf(&buf, "(name '%s')", def->name);
virBufferEscapeSexpr(&buf, "(name '%s')", def->name);
virBufferVSprintf(&buf, "(memory %lu)(maxmem %lu)",
def->mem.cur_balloon/1024, def->mem.max_balloon/1024);
virBufferVSprintf(&buf, "(vcpus %u)", def->maxvcpus);
@ -5753,7 +5763,7 @@ xenDaemonFormatSxpr(virConnectPtr conn,
char *ranges = virDomainCpuSetFormat(def->cpumask, def->cpumasklen);
if (ranges == NULL)
goto error;
virBufferVSprintf(&buf, "(cpus '%s')", ranges);
virBufferEscapeSexpr(&buf, "(cpus '%s')", ranges);
VIR_FREE(ranges);
}
@ -5761,16 +5771,16 @@ xenDaemonFormatSxpr(virConnectPtr conn,
virBufferVSprintf(&buf, "(uuid '%s')", uuidstr);
if (def->description)
virBufferVSprintf(&buf, "(description '%s')", def->description);
virBufferEscapeSexpr(&buf, "(description '%s')", def->description);
if (def->os.bootloader) {
if (def->os.bootloader[0])
virBufferVSprintf(&buf, "(bootloader '%s')", def->os.bootloader);
virBufferEscapeSexpr(&buf, "(bootloader '%s')", def->os.bootloader);
else
virBufferAddLit(&buf, "(bootloader)");
if (def->os.bootloaderArgs)
virBufferVSprintf(&buf, "(bootloader_args '%s')", def->os.bootloaderArgs);
virBufferEscapeSexpr(&buf, "(bootloader_args '%s')", def->os.bootloaderArgs);
}
if (!(tmp = virDomainLifecycleTypeToString(def->onPoweroff))) {
@ -5827,20 +5837,20 @@ xenDaemonFormatSxpr(virConnectPtr conn,
}
if (def->os.kernel)
virBufferVSprintf(&buf, "(kernel '%s')", def->os.kernel);
virBufferEscapeSexpr(&buf, "(kernel '%s')", def->os.kernel);
if (def->os.initrd)
virBufferVSprintf(&buf, "(ramdisk '%s')", def->os.initrd);
virBufferEscapeSexpr(&buf, "(ramdisk '%s')", def->os.initrd);
if (def->os.root)
virBufferVSprintf(&buf, "(root '%s')", def->os.root);
virBufferEscapeSexpr(&buf, "(root '%s')", def->os.root);
if (def->os.cmdline)
virBufferVSprintf(&buf, "(args '%s')", def->os.cmdline);
virBufferEscapeSexpr(&buf, "(args '%s')", def->os.cmdline);
if (hvm) {
char bootorder[VIR_DOMAIN_BOOT_LAST+1];
if (def->os.kernel)
virBufferVSprintf(&buf, "(loader '%s')", def->os.loader);
virBufferEscapeSexpr(&buf, "(loader '%s')", def->os.loader);
else
virBufferVSprintf(&buf, "(kernel '%s')", def->os.loader);
virBufferEscapeSexpr(&buf, "(kernel '%s')", def->os.loader);
virBufferVSprintf(&buf, "(vcpus %u)", def->maxvcpus);
if (def->vcpus < def->maxvcpus)
@ -5883,14 +5893,14 @@ xenDaemonFormatSxpr(virConnectPtr conn,
def->disks[i]->src == NULL)
break;
virBufferVSprintf(&buf, "(cdrom '%s')",
def->disks[i]->src);
virBufferEscapeSexpr(&buf, "(cdrom '%s')",
def->disks[i]->src);
break;
case VIR_DOMAIN_DISK_DEVICE_FLOPPY:
/* all xend versions define floppies here */
virBufferVSprintf(&buf, "(%s '%s')", def->disks[i]->dst,
def->disks[i]->src);
virBufferEscapeSexpr(&buf, "(%s ", def->disks[i]->dst);
virBufferEscapeSexpr(&buf, "'%s')", def->disks[i]->src);
break;
default:
@ -5942,7 +5952,7 @@ xenDaemonFormatSxpr(virConnectPtr conn,
/* get the device emulation model */
if (def->emulator && (hvm || xendConfigVersion >= 3))
virBufferVSprintf(&buf, "(device_model '%s')", def->emulator);
virBufferEscapeSexpr(&buf, "(device_model '%s')", def->emulator);
/* PV graphics for xen <= 3.0.4, or HVM graphics for xen <= 3.1.0 */
@ -5986,7 +5996,9 @@ xenDaemonFormatSxpr(virConnectPtr conn,
goto error;
}
return virBufferContentAndReset(&buf);
bufout = virBufferContentAndReset(&buf);
DEBUG("Formatted sexpr: \n%s", bufout);
return bufout;
error:
virBufferFreeAndReset(&buf);

1
tests/xml2sexprdata/xml2sexpr-escape.sexpr Normal file
View File

@ -0,0 +1 @@
(vm (name 'fvtest')(memory 420)(maxmem 420)(vcpus 2)(uuid '596a5d21-71f4-8fb2-e068-e2386a5c413e')(on_poweroff 'destroy')(on_reboot 'destroy')(on_crash 'destroy')(image (hvm (kernel '/var/lib/xen/vmlinuz.2Dn2YT')(ramdisk '/var/lib/xen/initrd.img.0u-Vhq')(args ' method=http://download.fedora.devel.redhat.com/pub/fedora/linux/core/test/5.91/x86_64/os&version="devel" ')(loader '/usr/lib/xen/boot/hvmloader')(vcpus 2)(boot c)(usb 1)(parallel none)(serial pty)(device_model '/usr/lib/xen/bin/qemu-dm')))(device (vbd (dev 'ioemu:xvda')(uname 'file:/root/\'\\some.img')(mode 'w'))))

24
tests/xml2sexprdata/xml2sexpr-escape.xml Normal file
View File

@ -0,0 +1,24 @@
<domain type='xen' id='15'>
<name>fvtest</name>
<uuid>596a5d2171f48fb2e068e2386a5c413e</uuid>
<os>
<type>hvm</type>
<kernel>/var/lib/xen/vmlinuz.2Dn2YT</kernel>
<initrd>/var/lib/xen/initrd.img.0u-Vhq</initrd>
<cmdline> method=http://download.fedora.devel.redhat.com/pub/fedora/linux/core/test/5.91/x86_64/os&amp;version="devel" </cmdline>
<loader>/usr/lib/xen/boot/hvmloader</loader>
</os>
<memory>430080</memory>
<vcpu>2</vcpu>
<on_poweroff>destroy</on_poweroff>
<on_reboot>destroy</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
<disk type='file' device='disk'>
<source file='/root/&apos;\some.img'/>
<target dev='xvda'/>
</disk>
<console tty='/dev/pts/4'/>
</devices>
</domain>

1
tests/xml2sexprtest.c
View File

@ -163,6 +163,7 @@ mymain(int argc, char **argv)
DO_TEST("fv-net-netfront", "fv-net-netfront", "fvtest", 1);
DO_TEST("boot-grub", "boot-grub", "fvtest", 1);
DO_TEST("escape", "escape", "fvtest", 1);
virCapabilitiesFree(caps);