mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 18:50:05 +01:00
Wei Liu
ae931f568f
This small helper is responsible for generating Dom0 JSON config stub and writing Dom0 xenstore entries. This helpers subsumes two calls to xenstore-write in xencommons script. Dom0 UUID is intentionally left untouched, so it is always all zeros. This makes sure that we don't leak Dom0 stubs across rebooting. Signed-off-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> [ ijc -- folded in incremental patch for *BSD ]
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
#include <err.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdio.h>
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#include <xenctrl.h>
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#include <xenstore.h>
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#include <libxl.h>
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#define DOMNAME_PATH "/local/domain/0/name"
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#define DOMID_PATH "/local/domain/0/domid"
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static libxl_ctx *ctx;
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static xentoollog_logger_stdiostream *logger;
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static struct xs_handle *xsh;
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static void ctx_alloc(void)
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{
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if (libxl_ctx_alloc(&ctx, LIBXL_VERSION, 0,
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(xentoollog_logger *)logger)) {
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fprintf(stderr, "cannot init libxl context\n");
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exit(1);
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}
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xsh = xs_open(0);
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if (!xsh) {
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fprintf(stderr, "cannot open xenstore connection\n");
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exit(1);
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}
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}
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static void ctx_free(void)
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{
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if (ctx) {
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libxl_ctx_free(ctx);
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ctx = NULL;
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}
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if (logger) {
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xtl_logger_destroy((xentoollog_logger *)logger);
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logger = NULL;
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}
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if (xsh) {
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xs_close(xsh);
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xsh = NULL;
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}
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}
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int main(int argc, char **argv)
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{
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int rc;
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libxl_domain_config dom0_config;
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char *domname_string = NULL, *domid_string = NULL;
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char *json = NULL;;
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logger = xtl_createlogger_stdiostream(stderr, XTL_ERROR, 0);
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if (!logger) exit(1);
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atexit(ctx_free);
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ctx_alloc();
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libxl_domain_config_init(&dom0_config);
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/* Sanity check: this program can only be run once. */
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domid_string = xs_read(xsh, XBT_NULL, DOMID_PATH, NULL);
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domname_string = xs_read(xsh, XBT_NULL, DOMNAME_PATH, NULL);
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if (domid_string && domname_string) {
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fprintf(stderr, "Dom0 is already set up\n");
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rc = 0;
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goto out;
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}
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/* Generate stub JSON config. */
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dom0_config.c_info.type = LIBXL_DOMAIN_TYPE_PV;
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libxl_domain_build_info_init_type(&dom0_config.b_info,
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LIBXL_DOMAIN_TYPE_PV);
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json = libxl_domain_config_to_json(ctx, &dom0_config);
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/* libxl-json format requires the string ends with '\0'. Code
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* snippet taken from libxl.
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*/
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rc = libxl_userdata_store(ctx, 0, "libxl-json",
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(const uint8_t *)json,
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strlen(json) + 1 /* include '\0' */);
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if (rc) {
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fprintf(stderr, "cannot store stub json config for Dom0\n");
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goto out;
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}
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/* Write xenstore entries. */
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if (!xs_write(xsh, XBT_NULL, DOMID_PATH, "0", strlen("0"))) {
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fprintf(stderr, "cannot set domid for Dom0\n");
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rc = 1;
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goto out;
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}
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if (!xs_write(xsh, XBT_NULL, DOMNAME_PATH, "Domain-0",
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strlen("Domain-0"))) {
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fprintf(stderr, "cannot set domain name for Dom0\n");
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rc = 1;
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goto out;
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}
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printf("Done setting up Dom0\n");
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out:
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libxl_domain_config_dispose(&dom0_config);
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free(domid_string);
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free(domname_string);
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free(json);
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return rc;
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}
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/*
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* Local variables:
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* mode: C
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* c-basic-offset: 4
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* indent-tabs-mode: nil
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* End:
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*/
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