Re: [libvirt] [PATCH V3 2/4] src/xenconfig: Xen-xl parser

From: Kiarie Kahurani <davidkiarie4(a)gmail.com&gt; Introduce a Xen xl parser This parser allows for users to convert the new xl disk format and spice graphics config to libvirt xml format and vice versa. Regarding the spice graphics config, the code is pretty much straight forward. For the disk {formating, parsing}, this parser takes care of the new xl format which include positional parameters and key/value parameters. In xl format disk config a <diskspec> consists of parameters separated by commas. If the parameters do not contain an '=' they are automatically assigned to certain options following the order below target, format, vdev, access The above are the only mandatory parameters in the <diskspec> but there are many more disk config options. These options can be specified as key=value pairs. This takes care of the rest of the options such as devtype, backend, backendtype, script, direct-io-safe, The positional paramters can also be specified in key/value form for example /dev/vg/guest-volume,,hda /dev/vg/guest-volume,raw,hda,rw format=raw, vdev=hda, access=rw, target=/dev/vg/guest-volume are interpleted to one config. In xm format, the above diskspec would be written as phy:/dev/vg/guest-volume,hda,w The disk parser is based on the same parser used successfully by the Xen project for several years now. Ian Jackson authored the scanner, which is used by this commit with mimimal changes. Only the PREFIX option is changed, to produce function and file names more consistent with libvirt's convention. Signed-off-by: Kiarie Kahurani <davidkiarie4(a)gmail.com&gt; Signed-off-by: Jim Fehlig <jfehlig(a)suse.com&gt; --- .gitignore | 1 + cfg.mk | 3 +- configure.ac | 1 + po/POTFILES.in | 1 + src/Makefile.am | 25 ++- src/libvirt_xenconfig.syms | 4 + src/xenconfig/xen_common.c | 3 +- src/xenconfig/xen_xl.c | 499 ++++++++++++++++++++++++++++++++++++++++++ src/xenconfig/xen_xl.h | 33 +++ src/xenconfig/xen_xl_disk.l | 256 ++++++++++++++++++++++ src/xenconfig/xen_xl_disk_i.h | 39 ++++ 11 files changed, 861 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore index 9d09709..eac2203 100644 --- a/.gitignore +++ b/.gitignore @@ -140,6 +140,7 @@ /src/remote/*_protocol.[ch] /src/rpc/virkeepaliveprotocol.[ch] /src/rpc/virnetprotocol.[ch] +/src/xenconfig/xen_xl_disk.[ch] /src/test_libvirt*.aug /src/test_virtlockd.aug /src/util/virkeymaps.h diff --git a/cfg.mk b/cfg.mk index 21f83c3..3df3dcb 100644 --- a/cfg.mk +++ b/cfg.mk @@ -89,8 +89,9 @@ distdir: sc_vulnerable_makefile_CVE-2012-3386.z endif # Files that should never cause syntax check failures. +# (^(HACKING|docs/(news\.html\.in|.*\.patch))|\.(po|fig|gif|ico|png))$$ VC_LIST_ALWAYS_EXCLUDE_REGEX = \ - (^(HACKING|docs/(news\.html\.in|.*\.patch))|\.(po|fig|gif|ico|png))$$ + (^(HACKING|docs/(news\.html\.in|.*\.patch)|src/xenconfig/xen_xl_disk.[chl])|\.(po|fig|gif|ico|png))$$ # Functions like free() that are no-ops on NULL arguments. useless_free_options = \ diff --git a/configure.ac b/configure.ac index 9fd44b2..777367e 100644 --- a/configure.ac +++ b/configure.ac @@ -146,6 +146,7 @@ m4_ifndef([LT_INIT], [ ]) AM_PROG_CC_C_O AM_PROG_LD +AM_PROG_LEX AC_MSG_CHECKING([for how to mark DSO non-deletable at runtime]) LIBVIRT_NODELETE= diff --git a/po/POTFILES.in b/po/POTFILES.in index e7cb2cc..094c8e3 100644 --- a/po/POTFILES.in +++ b/po/POTFILES.in @@ -247,6 +247,7 @@ src/xenapi/xenapi_driver.c src/xenapi/xenapi_utils.c src/xenconfig/xen_common.c src/xenconfig/xen_sxpr.c +src/xenconfig/xen_xl.c src/xenconfig/xen_xm.c tests/virpolkittest.c tools/libvirt-guests.sh.in diff --git a/src/Makefile.am b/src/Makefile.am index b6c1701..23c433d 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -999,11 +999,22 @@ CPU_SOURCES = \ VMX_SOURCES = \ vmx/vmx.c vmx/vmx.h +AM_LFLAGS = -Pxl_disk_ --header-file=../$*.h +LEX_OUTPUT_ROOT = lex.xl_disk_ +BUILT_SOURCES += xenconfig/xen_xl_disk.c xenconfig/xen_xl_disk.h +# Generated header file is not implicitly added to dist +EXTRA_DIST += xenconfig/xen_xl_disk.h +CLEANFILES += xenconfig/xen_xl_disk.h xenconfig/xen_xl_disk.c + +XENXLDISKPARSER_SOURCES = xenconfig/xen_xl_disk.l + XENCONFIG_SOURCES = \ xenconfig/xenxs_private.h \ - xenconfig/xen_common.c xenconfig/xen_common.h \ + xenconfig/xen_common.c xenconfig/xen_common.h \ xenconfig/xen_sxpr.c xenconfig/xen_sxpr.h \ - xenconfig/xen_xm.c xenconfig/xen_xm.h + xenconfig/xen_xm.c xenconfig/xen_xm.h \ + xenconfig/xen_xl.c xenconfig/xen_xl.h \ + xenconfig/xen_xl_disk_i.h pkgdata_DATA = cpu/cpu_map.xml @@ -1058,10 +1069,19 @@ libvirt_vmx_la_SOURCES = $(VMX_SOURCES) endif WITH_VMX if WITH_XENCONFIG +# Flex generated XL disk parser needs to be compiled without WARN_FLAGS +# Add the generated object to its own library to control CFLAGS +noinst_LTLIBRARIES += libvirt_xenxldiskparser.la +libvirt_xenxldiskparser_la_CFLAGS = \ + -I$(top_srcdir)/src/conf +libvirt_xenxldiskparser_la_SOURCES = \ + $(XENXLDISKPARSER_SOURCES) + noinst_LTLIBRARIES += libvirt_xenconfig.la libvirt_la_BUILT_LIBADD += libvirt_xenconfig.la libvirt_xenconfig_la_CFLAGS = \ -I$(top_srcdir)/src/conf $(AM_CFLAGS) +libvirt_xenconfig_la_LIBADD = libvirt_xenxldiskparser.la libvirt_xenconfig_la_SOURCES = $(XENCONFIG_SOURCES) endif WITH_XENCONFIG @@ -1823,6 +1843,7 @@ EXTRA_DIST += \ $(VBOX_DRIVER_EXTRA_DIST) \ $(VMWARE_DRIVER_SOURCES) \ $(XENCONFIG_SOURCES) \ + $(XENXLDISKPARSER_SOURCES) \ $(ACCESS_DRIVER_POLKIT_POLICY) check-local: check-augeas diff --git a/src/libvirt_xenconfig.syms b/src/libvirt_xenconfig.syms index 6541685..3e2e5d6 100644 --- a/src/libvirt_xenconfig.syms +++ b/src/libvirt_xenconfig.syms @@ -16,6 +16,10 @@ xenParseSxprChar; xenParseSxprSound; xenParseSxprString; +#xenconfig/xen_xl.h +xenFormatXL; +xenParseXL; + # xenconfig/xen_xm.h xenFormatXM; xenParseXM; diff --git a/src/xenconfig/xen_common.c b/src/xenconfig/xen_common.c index 8ff10a0..b94b5db 100644 --- a/src/xenconfig/xen_common.c +++ b/src/xenconfig/xen_common.c @@ -1801,7 +1801,8 @@ xenFormatVfb(virConfPtr conf, virDomainDefPtr def, int xendConfigVersion) { int hvm = STREQ(def->os.type, "hvm") ? 1 : 0; - if (def->ngraphics == 1) { + if (def->ngraphics == 1 && + def->graphics[0]->type != VIR_DOMAIN_GRAPHICS_TYPE_SPICE) { if (hvm || (xendConfigVersion < XEND_CONFIG_MIN_VERS_PVFB_NEWCONF)) { if (def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SDL) { if (xenConfigSetInt(conf, "sdl", 1) < 0) diff --git a/src/xenconfig/xen_xl.c b/src/xenconfig/xen_xl.c new file mode 100644 index 0000000..8d1d2a7 --- /dev/null +++ b/src/xenconfig/xen_xl.c @@ -0,0 +1,499 @@ +/* + * xen_xl.c: Xen XL parsing functions + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <http://www.gnu.org/licenses/>;. + * + * Author: Kiarie Kahurani <davidkiarie4(a)gmail.com&gt; + */ + +#include <config.h> + +#include "virconf.h" +#include "virerror.h" +#include "domain_conf.h" +#include "viralloc.h" +#include "virstring.h" +#include "xen_xl.h" +#include "xen_xl_disk.h" +#include "xen_xl_disk_i.h" + +#define VIR_FROM_THIS VIR_FROM_NONE + + +static int +xenParseXLSpice(virConfPtr conf, virDomainDefPtr def) +{ + virDomainGraphicsDefPtr graphics = NULL; + unsigned long port; + char *listenAddr = NULL; + int val; + + if (STREQ(def->os.type, "hvm")) { + if (xenConfigGetBool(conf, "spice", &val, 0) < 0) + return -1; + + if (val) { + if (VIR_ALLOC(graphics) < 0) + return -1; + + graphics->type = VIR_DOMAIN_GRAPHICS_TYPE_SPICE; + if (xenConfigCopyStringOpt(conf, "spicehost", &listenAddr) < 0) + goto cleanup; + if (listenAddr && + virDomainGraphicsListenSetAddress(graphics, 0, listenAddr, + -1, true) < 0) { + goto cleanup; + } + VIR_FREE(listenAddr); + + if (xenConfigGetULong(conf, "spicetls_port", &port, 0) < 0) + goto cleanup; + graphics->data.spice.tlsPort = (int)port; + + if (xenConfigGetULong(conf, "spiceport", &port, 0) < 0) + goto cleanup; + + graphics->data.spice.port = (int)port; + + if (!graphics->data.spice.tlsPort && + !graphics->data.spice.port) + graphics->data.spice.autoport = 1; + + if (xenConfigGetBool(conf, "spicedisable_ticketing", &val, 0) < 0) + goto cleanup; + if (val) { + if (xenConfigCopyStringOpt(conf, "spicepasswd", + &graphics->data.spice.auth.passwd) < 0) + goto cleanup; + } + + if (xenConfigGetBool(conf, "spiceagent_mouse", + &graphics->data.spice.mousemode, 0) < 0) + goto cleanup; + if (xenConfigGetBool(conf, "spicedvagent", &val, 0) < 0) + goto cleanup; + if (val) { + if (xenConfigGetBool(conf, "spice_clipboard_sharing", + &graphics->data.spice.copypaste, + 0) < 0) + goto cleanup; + } + + if (VIR_ALLOC_N(def->graphics, 1) < 0) + goto cleanup; + def->graphics[0] = graphics; + def->ngraphics = 1; + } + } + + return 0; + + cleanup: + virDomainGraphicsDefFree(graphics); + return -1; +} + + +void +xenXLDiskParserError(xenXLDiskParserContext *dpc, + const char *erroneous, + const char *message) +{ + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("disk config %s not supported: %s"), + erroneous, message); + + if (!dpc->err) + dpc->err = EINVAL; +} + + +static int +xenXLDiskParserPrep(xenXLDiskParserContext *dpc, + const char *spec, + virDomainDiskDefPtr disk) +{ + int err; + + dpc->spec = spec; + dpc->disk = disk; + dpc->access_set = 0; + + err = xl_disk_lex_init_extra(dpc, &dpc->scanner); + if (err) + goto fail; + + dpc->buf = xl_disk__scan_bytes(spec, strlen(spec), dpc->scanner); + if (!dpc->buf) { + err = ENOMEM; + goto fail; + } + + return 0; + + fail: + virReportSystemError(errno, "%s", + _("failed to initialize disk configuration parser")); + return err; +} + + +static void +xenXLDiskParserCleanup(xenXLDiskParserContext *dpc) +{ + if (dpc->buf) { + xl_disk__delete_buffer(dpc->buf, dpc->scanner); + dpc->buf = NULL; + } + + if (dpc->scanner) { + xl_disk_lex_destroy(dpc->scanner); + dpc->scanner = NULL; + } +} + + +/* + * positional parameters + * (If the <diskspec> strings are not separated by "=" + * the string is split following ',' and assigned to + * the following options in the following order) + * target,format,vdev,access + * ================================================================ + * + * The parameters below cannot be specified as positional parameters: + * + * other parameters + * devtype = <devtype> + * backendtype = <backend-type> + * parameters not taken care of + * backend = <domain-name> + * script = <script> + * direct-io-safe + * + * ================================================================ + * The parser does not take any deprecated parameters + * + * For more information refer to /xen/docs/misc/xl-disk-configuration.txt + */ +static int +xenParseXLDisk(virConfPtr conf, virDomainDefPtr def) +{ + virConfValuePtr list = virConfGetValue(conf, "disk"); + xenXLDiskParserContext dpc; + virDomainDiskDefPtr disk; + + memset(&dpc, 0, sizeof(dpc)); + + if (list && list->type == VIR_CONF_LIST) { + list = list->list; + while (list) { + char *disk_spec = list->str; + const char *driver; + + if ((list->type != VIR_CONF_STRING) || (list->str == NULL)) + goto skipdisk; + + if (!(disk = virDomainDiskDefNew())) + return -1; + + disk->src->readonly = 0; + disk->src->format = VIR_STORAGE_FILE_LAST; + + if (xenXLDiskParserPrep(&dpc, disk_spec, disk)) + goto fail; + + xl_disk_lex(dpc.scanner); + + if (dpc.err) + goto fail; + + if (disk->src->format == VIR_STORAGE_FILE_LAST) + disk->src->format = VIR_STORAGE_FILE_RAW; + + if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM) { + disk->removable = true; + disk->src->readonly = true; + if (virDomainDiskSetDriver(disk, "qemu") < 0) + goto fail; + + virDomainDiskSetType(disk, VIR_STORAGE_TYPE_FILE); + if (!disk->src->path || STREQ(disk->src->path, "")) + disk->src->format = VIR_STORAGE_FILE_NONE; + } + + if (STRPREFIX(disk->dst, "xvd") || !STREQ(def->os.type, "hvm")) + disk->bus = VIR_DOMAIN_DISK_BUS_XEN; + else if (STRPREFIX(disk->dst, "sd")) + disk->bus = VIR_DOMAIN_DISK_BUS_SCSI; + else + disk->bus = VIR_DOMAIN_DISK_BUS_IDE; + + driver = virDomainDiskGetDriver(disk); + if (!driver) { + switch (disk->src->format) { + case VIR_STORAGE_FILE_QCOW: + case VIR_STORAGE_FILE_QCOW2: + case VIR_STORAGE_FILE_VHD: + driver = "qemu"; + if (virDomainDiskSetDriver(disk, "qemu") < 0) + goto fail; + break; + default: + driver = "phy"; + if (virDomainDiskSetDriver(disk, "phy") < 0) + goto fail; + } + } + + if (STREQ(driver, "phy")) + virDomainDiskSetType(disk, VIR_STORAGE_TYPE_BLOCK); + else + virDomainDiskSetType(disk, VIR_STORAGE_TYPE_FILE); + + if (VIR_APPEND_ELEMENT(def->disks, def->ndisks, disk) < 0) + goto fail; + + skipdisk: + list = list->next; + xenXLDiskParserCleanup(&dpc); + } + } + return 0; + + fail: + xenXLDiskParserCleanup(&dpc); + virDomainDiskDefFree(disk); + return -1; +} + + +virDomainDefPtr +xenParseXL(virConfPtr conf, virCapsPtr caps, int xendConfigVersion) +{ + virDomainDefPtr def = NULL; + + if (VIR_ALLOC(def) < 0) + return NULL; + + def->virtType = VIR_DOMAIN_VIRT_XEN; + def->id = -1; + + if (xenParseConfigCommon(conf, def, caps, xendConfigVersion) < 0) + goto cleanup; + + if (xenParseXLDisk(conf, def) < 0) + goto cleanup; + + if (xenParseXLSpice(conf, def) < 0) + goto cleanup; + + return def; + + cleanup: + virDomainDefFree(def); + return NULL; +} + + +static int +xenFormatXLDisk(virConfValuePtr list, virDomainDiskDefPtr disk) +{ + virBuffer buf = VIR_BUFFER_INITIALIZER; + virConfValuePtr val, tmp; + const char *src = virDomainDiskGetSource(disk); + int format = virDomainDiskGetFormat(disk); + + /* target */ + virBufferAsprintf(&buf, "%s,", src); + /* format */ + switch (format) { + case VIR_STORAGE_FILE_RAW: + virBufferAddLit(&buf, "raw,"); + break; + case VIR_STORAGE_FILE_VHD: + virBufferAddLit(&buf, "xvhd,"); + break; + case VIR_STORAGE_FILE_QCOW: + virBufferAddLit(&buf, "qcow,"); + break; + case VIR_STORAGE_FILE_QCOW2: + virBufferAddLit(&buf, "qcow2,"); + break; + /* set default */ + default: + virBufferAddLit(&buf, "raw,"); + } + + /* device */ + virBufferAdd(&buf, disk->dst, -1); + + virBufferAddLit(&buf, ","); + + if (disk->src->readonly) + virBufferAddLit(&buf, "r,"); + else if (disk->src->shared) + virBufferAddLit(&buf, "!,"); + else + virBufferAddLit(&buf, "w,"); + if (disk->transient) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("transient disks not supported yet")); + goto cleanup; + } + + if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM) + virBufferAddLit(&buf, "devtype=cdrom"); + + if (virBufferCheckError(&buf) < 0) + goto cleanup; + + if (VIR_ALLOC(val) < 0) + goto cleanup; + + val->type = VIR_CONF_STRING; + val->str = virBufferContentAndReset(&buf); + tmp = list->list; + while (tmp && tmp->next) + tmp = tmp->next; + if (tmp) + tmp->next = val; + else + list->list = val; + return 0; + + cleanup: + virBufferFreeAndReset(&buf); + return -1; +} + + +static int +xenFormatXLDomainDisks(virConfPtr conf, virDomainDefPtr def) +{ + virConfValuePtr diskVal = NULL; + size_t i = 0; + + if (VIR_ALLOC(diskVal) < 0) + return -1; + + diskVal->type = VIR_CONF_LIST; + diskVal->list = NULL; + + for (i = 0; i < def->ndisks; i++) { + if (def->disks[i]->device == VIR_DOMAIN_DISK_DEVICE_FLOPPY) + continue; + if (xenFormatXLDisk(diskVal, def->disks[i]) < 0) + + goto cleanup; + } + + if (diskVal->list != NULL) { + int ret = virConfSetValue(conf, "disk", diskVal); + diskVal = NULL; + if (ret < 0) + goto cleanup; + } + + return 0; + + cleanup: + virConfFreeValue(diskVal); + return 0; +} + + +static int +xenFormatXLSpice(virConfPtr conf, virDomainDefPtr def) +{ + const char *listenAddr = NULL; + + if (STREQ(def->os.type, "hvm")) { + if (def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE) { + /* set others to false but may not be necessary */ + if (xenConfigSetInt(conf, "sdl", 0) < 0) + return -1; + + if (xenConfigSetInt(conf, "vnc", 0) < 0) + return -1; + + if (xenConfigSetInt(conf, "spice", 1) < 0) + return -1; + + if (xenConfigSetInt(conf, "spiceport", + def->graphics[0]->data.spice.port) < 0) + return -1; + + if (xenConfigSetInt(conf, "spicetls_port", + def->graphics[0]->data.spice.tlsPort) < 0) + return -1; + + if (def->graphics[0]->data.spice.auth.passwd) { + if (xenConfigSetInt(conf, "spicedisable_ticketing", 1) < 0) + return -1; + + if (def->graphics[0]->data.spice.auth.passwd && + xenConfigSetString(conf, "spicepasswd", + def->graphics[0]->data.spice.auth.passwd) < 0) + return -1; + } + + listenAddr = virDomainGraphicsListenGetAddress(def->graphics[0], 0); + if (listenAddr && + xenConfigSetString(conf, "spicehost", listenAddr) < 0) + return -1; + + if (xenConfigSetInt(conf, "spicemouse_mouse", + def->graphics[0]->data.spice.mousemode) < 0) + return -1; + + if (def->graphics[0]->data.spice.copypaste) { + if (xenConfigSetInt(conf, "spicedvagent", 1) < 0) + return -1; + if (xenConfigSetInt(conf, "spice_clipboard_sharing", + def->graphics[0]->data.spice.copypaste) < 0) + return -1; + } + } + } + + return 0; +} + + +virConfPtr +xenFormatXL(virDomainDefPtr def, virConnectPtr conn, int xendConfigVersion) +{ + virConfPtr conf = NULL; + + if (!(conf = virConfNew())) + goto cleanup; + + if (xenFormatConfigCommon(conf, def, conn, xendConfigVersion) < 0) + goto cleanup; + + if (xenFormatXLDomainDisks(conf, def) < 0) + goto cleanup; + + if (xenFormatXLSpice(conf, def) < 0) + goto cleanup; + + return conf; + + cleanup: + if (conf) + virConfFree(conf); + return NULL; +} diff --git a/src/xenconfig/xen_xl.h b/src/xenconfig/xen_xl.h new file mode 100644 index 0000000..536e9b7 --- /dev/null +++ b/src/xenconfig/xen_xl.h @@ -0,0 +1,33 @@ +/* + * xen_xl.h: Xen XL parsing functions + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <http://www.gnu.org/licenses/>;. + * + * Author: Kiarie Kahurani&lt;davidkiarie4(a)gmail.com&gt; + */ + +#ifndef __VIR_XEN_XL_H__ +# define __VIR_XEN_XL_H__ + +# include "virconf.h" +# include "domain_conf.h" +# include "xen_common.h" + +virDomainDefPtr xenParseXL(virConfPtr conn, virCapsPtr caps, + int xendConfigVersion); +virConfPtr xenFormatXL(virDomainDefPtr def, + virConnectPtr, int xendConfigVersion); + +#endif /* __VIR_XEN_XL_H__ */ diff --git a/src/xenconfig/xen_xl_disk.l b/src/xenconfig/xen_xl_disk.l new file mode 100644 index 0000000..164aa32 --- /dev/null +++ b/src/xenconfig/xen_xl_disk.l @@ -0,0 +1,256 @@ +/* + * xen_xl_disk.l - parser for disk specification strings + * + * Copyright (C) 2011 Citrix Ltd. + * Author Ian Jackson <ian.jackson(a)eu.citrix.com&gt; + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published + * by the Free Software Foundation; version 2.1 only. with the special + * exception on linking described in file LICENSE. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + */ + +/* + * Parsing the old xm/xend/xl-4.1 disk specs is a tricky problem, + * because the target string might in theory contain "," which is the + * delimiter we use for stripping off things on the RHS, and ":", + * which is the delimiter we use for stripping off things on the LHS. + * + * In this parser we do not support such target strings in the old + * syntax; if the target string has to contain "," or ":" the new + * syntax's "target=" should be used. + */ +%{ +# include <config.h> + +# include <stdio.h> + +# include "viralloc.h" +# include "virstoragefile.h" +# include "virstring.h" +# include "domain_conf.h" +# include "xen_xl.h" +# include "xen_xl_disk_i.h" + +#define YY_NO_INPUT +#define VIR_FROM_THIS VIR_FROM_NONE + +/* Some versions of flex have a bug (Fedora bugzilla 612465) which causes + * it to fail to declare these functions, which it defines. So declare + * them ourselves. Hopefully we won't have to simultaneously support + * a flex version which declares these differently somehow. */ +int xl_disk_lexget_column(yyscan_t yyscanner); +void xl_disk_lexset_column(int column_no, yyscan_t yyscanner); + + +/*----- useful macros and functions used in actions ----- + * we use macros in the actual rules to keep the actions short + * and particularly to avoid repeating boilerplate values such as + * DPC->disk, yytext, etc. */ + +/* For actions whose patterns contain '=', finds the start of the value */ +#define FROMEQUALS (strchr(yytext,'=')+1) + +/* Chops the delimiter off, modifying yytext and yyleng. */ +#define STRIP(delim) do{ \ + if (yyleng>0 && yytext[yyleng-1]==(delim)) \ + yytext[--yyleng] = 0; \ + }while(0) + +/* Sets a string value, checking it hasn't been set already. */ +#define SAVESTRING(what,loc,val) do{ \ + savestring(DPC, what " respecified", &DPC->disk->loc, (val)); \ + }while(0) + + +static void +savestring(xenXLDiskParserContext *dpc, + const char *what_respecified, + char **update, + const char *value) +{ + if (*update) { + if (**update) { + xenXLDiskParserError(dpc, value, what_respecified); + return; + } + + VIR_FREE(*update); /* do not complain about overwriting empty strings */ + } + + ignore_value(VIR_STRDUP(*update, value)); +} + +#define DPC dpc /* our convention in lexer helper functions */ + +/* Sets ->readwrite from the string. */ +static void +setaccess(xenXLDiskParserContext *dpc, const char *str) +{ + if (STREQ(str, "rw") || STREQ(str, "w")) { + dpc->disk->src->readonly = 0; + } else if (STREQ(str, "r") || STREQ(str, "ro")) { + dpc->disk->src->readonly = 1; + } else if (STREQ(str, "w!") || STREQ(str, "!")) { + dpc->disk->src->readonly = 0; + dpc->disk->src->shared = 1; + } else { + xenXLDiskParserError(dpc, str, "unknown value for access"); + } + dpc->access_set = 1; +} + +/* Sets ->format from the string. IDL should provide something for this. */ +static void +setformat(xenXLDiskParserContext *dpc, const char *str) +{ + if (STREQ(str, "") || STREQ(str, "raw")) + virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_RAW); + else if (STREQ(str, "qcow")) + virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_QCOW); + else if (STREQ(str, "qcow2")) + virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_QCOW2); + else if (STREQ(str, "vhd")) + virDomainDiskSetFormat(dpc->disk, VIR_STORAGE_FILE_VHD); + else + xenXLDiskParserError(dpc, str, "unknown value for format"); +} + + +/* Sets ->backend from the string. IDL should provide something for this. */ +static void +setdrivertype(xenXLDiskParserContext *dpc, const char *str) +{ + if (STREQ(str, "phy")) + ignore_value(virDomainDiskSetDriver(dpc->disk, "phy")); + else if (STREQ(str, "tap")) + ignore_value(virDomainDiskSetDriver(dpc->disk, "tap")); + else if (STREQ(str, "file") || STREQ(str, "")) + ignore_value(virDomainDiskSetDriver(dpc->disk, "qemu")); + else + xenXLDiskParserError(dpc, str, "unknown value for backendtype"); +} + + +/* Handles a vdev positional parameter which includes a devtype. */ +static int +vdev_and_devtype(xenXLDiskParserContext *dpc, char *str) +{ + /* returns 1 if it was <vdev>:<devtype>, 0 (doing nothing) otherwise */ + char *colon = strrchr(str, ':'); + if (!colon) + return 0; + + *colon++ = 0; + SAVESTRING("vdev", dst, str); + + if (STREQ(colon,"cdrom")) { + DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_CDROM; + } else if (STREQ(colon, "disk")) { + DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_DISK; + } else { + xenXLDiskParserError(DPC, colon, "unknown deprecated type"); + } + return 1; +} + +#undef DPC /* needs to be defined differently the actual lexer */ +#define DPC ((xenXLDiskParserContext*)yyextra) + +%} + +%option warn +%option nodefault +%option batch +%option 8bit +%option noyywrap +%option reentrant +%option nounput + +%x LEXERR + +%% + + /*----- the scanner rules which do the parsing -----*/ + +[ \t\n]+/([^ \t\n].*)? { /* ignore whitespace before parameters */ } + + /* ordinary parameters setting enums or strings */ + +format=[^,]*,? { STRIP(','); setformat(DPC, FROMEQUALS); } + +cdrom,? { DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_CDROM; } +devtype=cdrom,? { DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_CDROM; } +devtype=disk,? { DPC->disk->device = VIR_DOMAIN_DISK_DEVICE_DISK; } +devtype=[^,]*,? { xenXLDiskParserError(DPC, yytext,"unknown value for type"); } + +access=[^,]*,? { STRIP(','); setaccess(DPC, FROMEQUALS); } +backendtype=[^,]*,? { STRIP(','); setdrivertype(DPC, FROMEQUALS); } + +vdev=[^,]*,? { STRIP(','); SAVESTRING("vdev", dst, FROMEQUALS); } + + /* the target magic parameter, eats the rest of the string */ + +target=.* { STRIP(','); SAVESTRING("target", src->path, FROMEQUALS); } + + /* unknown parameters */ + +[a-z][-a-z0-9]*=[^,],? { xenXLDiskParserError(DPC, yytext, "unknown parameter"); } + + /* the "/.*" in these patterns ensures that they count as if they + * matched the whole string, so these patterns take precedence */ + +(raw|qcow2?|vhd):/.* { + STRIP(':'); + DPC->had_depr_prefix=1; + setformat(DPC, yytext); + } + +tapdisk:/.* { DPC->had_depr_prefix=1; } +tap2?:/.* { DPC->had_depr_prefix=1; } +aio:/.* { DPC->had_depr_prefix=1; } +ioemu:/.* { DPC->had_depr_prefix=1; } +file:/.* { DPC->had_depr_prefix=1; } +phy:/.* { DPC->had_depr_prefix=1; } +[a-z][a-z0-9]*:/([^a-z0-9].*)? { + xenXLDiskParserError(DPC, yytext, "unknown deprecated disk prefix"); + return 0; + } + + /* positional parameters */ + +[^=,]*,|[^=,]+,? { + STRIP(','); + + if (DPC->err) { + /* previous errors may just lead to subsequent ones */ + } else if (!DPC->disk->src->path) { + SAVESTRING("target", src->path, yytext); + } else if (DPC->disk->src->format == VIR_STORAGE_FILE_LAST){ + setformat(DPC, yytext); + } + else if (!DPC->disk->dst) { + if (!vdev_and_devtype(DPC, yytext)) + SAVESTRING("vdev", dst, yytext); + } else if (!DPC->access_set) { + DPC->access_set = 1; + setaccess(DPC, yytext); + } else { + xenXLDiskParserError(DPC, yytext, "too many positional parameters"); + return 0; /* don't print any more errors */ + } +} + +. { + BEGIN(LEXERR); + yymore(); +} +<LEXERR>.* { + xenXLDiskParserError(DPC, yytext, "bad disk syntax"); + return 0; +} diff --git a/src/xenconfig/xen_xl_disk_i.h b/src/xenconfig/xen_xl_disk_i.h new file mode 100644 index 0000000..063dedf --- /dev/null +++ b/src/xenconfig/xen_xl_disk_i.h @@ -0,0 +1,39 @@ +/* + * xen_xl_disk_i.h - common header for disk spec parser + * + * Copyright (C) 2011 Citrix Ltd. + * Author Ian Jackson <ian.jackson(a)eu.citrix.com&gt; + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published + * by the Free Software Foundation; version 2.1 only. with the special + * exception on linking described in file LICENSE. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + */ + +#ifndef __VIR_XEN_XL_DISK_I_H__ +# define __VIR_XEN_XL_DISK_I_H__ + +# include "virconf.h" +# include "domain_conf.h" + + +typedef struct { + int err; + void *scanner; + YY_BUFFER_STATE buf; + virDomainDiskDefPtr disk; + int access_set; + int had_depr_prefix; + const char *spec; +} xenXLDiskParserContext; + +void xenXLDiskParserError(xenXLDiskParserContext *dpc, + const char *erroneous, + const char *message); + +#endif /* __VIR_XEN_XL_DISK_I_H__ */