-#define _GNU_SOURCE
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+#include <stdlib.h>
#include <string.h>
#include <talloc/talloc.h>
#include <url/url.h>
+#include <log/log.h>
+#include <file/file.h>
+#include <i18n/i18n.h>
#include "parser.h"
#include "parser-conf.h"
#include "parser-utils.h"
#include "resource.h"
#include "paths.h"
+#include "event.h"
#include "user-event.h"
+#include "network.h"
+
+static const char *pxelinux_prefix = "pxelinux.cfg/";
struct pxe_parser_info {
struct discover_boot_option *opt;
discover_context_add_boot_option(conf->dc, info->opt);
}
+/* We need a slightly modified version of pb_url_join, to allow for the
+ * pxelinux "::filename" syntax for absolute URLs
+ */
+static struct pb_url *pxe_url_join(void *ctx, const struct pb_url *url,
+ const char *s)
+{
+ struct pb_url *new_url;
+ int len;
+
+ len = strlen(s);
+
+ if (len > 2 && s[0] == ':' && s[1] == ':') {
+ char *tmp;
+
+ if (s[2] == '/') {
+ /* ::/path -> /path */
+ tmp = talloc_strdup(ctx, s+2);
+ } else {
+ /* ::path -> /path */
+ tmp = talloc_strdup(ctx, s+1);
+ tmp[0] = '/';
+ }
+
+ new_url = pb_url_join(ctx, url, tmp);
+
+ talloc_free(tmp);
+
+ } else {
+ const char *tmp;
+ /* strip leading slashes */
+ for (tmp = s; *tmp == '/'; tmp++)
+ ;
+ new_url = pb_url_join(ctx, url, tmp);
+ }
+
+ return new_url;
+}
+
+static void pxe_append_string(struct discover_boot_option *opt,
+ const char *str)
+{
+ if (opt->option->boot_args)
+ opt->option->boot_args = talloc_asprintf_append(
+ opt->option->boot_args, " %s", str);
+ else
+ opt->option->boot_args = talloc_strdup(opt->option, str);
+}
+
+static char *pxe_sysappend_mac(void *ctx, uint8_t *mac)
+{
+ if (!mac)
+ return NULL;
+
+ return talloc_asprintf(ctx,
+ "BOOTIF=01-%02x-%02x-%02x-%02x-%02x-%02x",
+ mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+}
+
+static void pxe_process_sysappend(struct discover_context *ctx,
+ struct discover_boot_option *opt,
+ unsigned long val)
+{
+ struct event *event = ctx->event;
+ char *str = NULL;
+
+ if (!event)
+ return;
+
+ if (val & 0x2) {
+ uint8_t *mac = find_mac_by_name(ctx, ctx->network,
+ event->device);
+ str = pxe_sysappend_mac(ctx, mac);
+ if (str) {
+ pxe_append_string(opt, str);
+ talloc_free(str);
+ }
+ val &= ~0x2;
+ }
+
+ if (val)
+ pb_log("pxe: unsupported features requested in "
+ "ipappend/sysappend: 0x%04lx", val);
+
+}
+
static void pxe_process_pair(struct conf_context *ctx,
const char *name, char *value)
{
return;
if (streq(name, "KERNEL")) {
- url = pb_url_join(ctx->dc, ctx->dc->conf_url, value);
+ url = pxe_url_join(ctx->dc, ctx->dc->conf_url, value);
opt->boot_image = create_url_resource(opt, url);
} else if (streq(name, "INITRD")) {
- url = pb_url_join(ctx->dc, ctx->dc->conf_url, value);
+ url = pxe_url_join(ctx->dc, ctx->dc->conf_url, value);
opt->initrd = create_url_resource(opt, url);
} else if (streq(name, "APPEND")) {
char *str, *end;
- opt->option->boot_args = talloc_strdup(opt->option, value);
+ pxe_append_string(opt, value);
str = strcasestr(value, "INITRD=");
if (str) {
end = strchrnul(str, ' ');
*end = '\0';
- url = pb_url_join(ctx->dc, ctx->dc->conf_url, str);
+ url = pxe_url_join(ctx->dc, ctx->dc->conf_url, str);
opt->initrd = create_url_resource(opt, url);
}
+ } else if (streq(name, "SYSAPPEND") || streq(name, "IPAPPEND")) {
+ unsigned long type;
+ char *end;
+
+ type = strtoul(value, &end, 10);
+ if (end != value && !(*end))
+ pxe_process_sysappend(ctx->dc, opt, type);
+
+ } else if (streq(name, "DTB") || streq(name, "FDT")) {
+ url = pxe_url_join(ctx->dc, ctx->dc->conf_url, value);
+ opt->dtb = create_url_resource(opt, url);
}
}
-static int pxe_parse(struct discover_context *dc)
+/*
+ * Callback for asynchronous loads from pxe_parse()
+ * @param result Result of load_url_async()
+ * @param data Pointer to associated conf_context
+ */
+static void pxe_conf_parse_cb(struct load_url_result *result, void *data)
{
- struct pxe_parser_info *parser_info;
- char **pxe_conf_files, **filename;
- struct pb_url *conf_url, *url;
- struct conf_context *conf;
+ struct conf_context *conf = data;
+ struct device_handler *handler;
+ struct boot_status status = {0};
+ char *buf = NULL;
int len, rc;
- char *buf;
- /* Expects dhcp event parameters to support network boot */
- if (!dc->event)
- return -1;
+ if (!data)
+ return;
+
+ if (!result || result->status != LOAD_OK) {
+ talloc_free(conf);
+ return;
+ }
+
+ rc = read_file(conf, result->local, &buf, &len);
+ if (rc) {
+ pb_log("Read failed during pxe callback for %s\n", result->local);
+ goto out_clean;
+ }
+
+ conf_parse_buf(conf, buf, len);
- conf = talloc_zero(dc, struct conf_context);
+ /* We may be called well after the original caller of iterate_parsers(),
+ * commit any new boot options ourselves */
+ handler = talloc_parent(conf);
+ device_handler_discover_context_commit(handler, conf->dc);
+
+ status.type = BOOT_STATUS_INFO;
+ /*
+ * TRANSLATORS: the format specifier in this string in an IP address,
+ * eg. 192.168.1.1
+ */
+ status.message = talloc_asprintf(conf, _("pxe: parsed config for %s"),
+ conf->dc->conf_url->host);
+ device_handler_boot_status(handler, &status);
+
+ talloc_free(buf);
+out_clean:
+ if (result->cleanup_local)
+ unlink(result->local);
+ talloc_free(conf);
+}
+
+/**
+ * Return a new conf_context and increment the talloc reference count on
+ * the discover_context struct.
+ * @param ctx Parent talloc context
+ * @param orig Original discover_context
+ * @return Pointer to new conf_context
+ */
+static struct conf_context *copy_context(void *ctx, struct discover_context *dc)
+{
+ struct pxe_parser_info *info;
+ struct conf_context *conf;
+
+ conf = talloc_zero(ctx, struct conf_context);
if (!conf)
- goto out;
+ return NULL;
- conf->dc = dc;
conf->get_pair = conf_get_pair_space;
conf->process_pair = pxe_process_pair;
conf->finish = pxe_finish;
+ info = talloc_zero(conf, struct pxe_parser_info);
+ if (!info) {
+ talloc_free(conf);
+ return NULL;
+ }
+ conf->parser_info = info;
+
+ /*
+ * The discover_context may be freed once pxe_parse() returns, but the
+ * callback will still need it. Take a reference so that that it will
+ * persist until the last callback completes.
+ */
+ conf->dc = talloc_reference(conf, dc);
+
+ return conf;
+}
+
+static int pxe_parse(struct discover_context *dc)
+{
+ struct pb_url *pxe_base_url, *url;
+ char **pxe_conf_files, **filename;
+ struct conf_context *conf = NULL;
+ struct load_url_result *result;
+ void *ctx = talloc_parent(dc);
+ bool complete_url;
- parser_info = talloc_zero(conf, struct pxe_parser_info);
- conf->parser_info = parser_info;
+ /* Expects dhcp event parameters to support network boot */
+ if (!dc->event)
+ return -1;
- conf_url = user_event_parse_conf_url(dc, dc->event);
- if (!conf_url)
- goto out_conf;
+ dc->conf_url = user_event_parse_conf_url(dc, dc->event, &complete_url);
+ if (!dc->conf_url)
+ return -1;
- if (dc->conf_url) {
- rc = parser_request_url(dc, dc->conf_url, &buf, &len);
- if (rc)
+ /*
+ * Retrieving PXE configs over the network can take some time depending
+ * on factors such as slow network, malformed paths, bad DNS, and
+ * overzealous firewalls. Instead of blocking the discover server while
+ * we wait for these, spawn an asynchronous job for each URL we can
+ * parse and process the resulting files in a callback. A separate
+ * conf_context is created for each job.
+ */
+ conf = copy_context(ctx, dc);
+ if (!conf)
+ return -1;
+
+ if (complete_url) {
+ /* we have a complete URL; use this and we're done. */
+ result = load_url_async(conf->dc, conf->dc->conf_url,
+ pxe_conf_parse_cb, conf);
+ if (!result) {
+ pb_log("load_url_async fails for %s\n",
+ dc->conf_url->path);
goto out_conf;
+ }
} else {
pxe_conf_files = user_event_parse_conf_filenames(dc, dc->event);
if (!pxe_conf_files)
goto out_conf;
- rc = -1;
+ pxe_base_url = pb_url_join(dc, dc->conf_url, pxelinux_prefix);
+ if (!pxe_base_url)
+ goto out_pxe_conf;
for (filename = pxe_conf_files; *filename; filename++) {
- url = pb_url_join(dc, conf_url, *filename);
+ if (!conf) {
+ conf = copy_context(ctx, dc);
+ }
+ url = pb_url_join(conf->dc, pxe_base_url, *filename);
if (!url)
- goto out_pxe_conf;
-
- rc = parser_request_url(dc, url, &buf, &len);
- if (!rc) /* found one, just break */
- break;
-
- talloc_free(url);
+ continue;
+ result = load_url_async(conf, url, pxe_conf_parse_cb,
+ conf);
+ if (!result) {
+ pb_log("load_url_async fails for %s\n",
+ conf->dc->conf_url->path);
+ talloc_free(conf);
+ }
+ /* conf now needed by callback, don't reuse */
+ conf = NULL;
}
- /* No configuration file found on the boot server */
- if (rc)
- goto out_pxe_conf;
-
- dc->conf_url = url;
-
- talloc_free(conf_url);
+ talloc_free(pxe_base_url);
talloc_free(pxe_conf_files);
}
- /* Call the config file parser with the data read from the file */
- conf_parse_buf(conf, buf, len);
-
- talloc_free(buf);
- talloc_free(conf);
-
return 0;
out_pxe_conf:
talloc_free(pxe_conf_files);
out_conf:
talloc_free(conf);
-out:
return -1;
}
projects / petitboot / blobdiff