2 #if defined(HAVE_CONFIG_H)
8 #include <talloc/talloc.h>
11 #include <file/file.h>
12 #include <i18n/i18n.h>
14 #include "device-handler.h"
16 #include "parser-conf.h"
17 #include "parser-utils.h"
21 #include "user-event.h"
24 static const char *pxelinux_prefix = "pxelinux.cfg/";
26 static void pxe_conf_parse_cb(struct load_url_result *result, void *data);
28 struct pxe_parser_info {
29 struct discover_boot_option *opt;
30 const char *default_name;
31 char **pxe_conf_files;
32 struct pb_url *pxe_base_url;
36 static void pxe_finish(struct conf_context *conf)
38 struct pxe_parser_info *info = conf->parser_info;
40 discover_context_add_boot_option(conf->dc, info->opt);
43 /* We need a slightly modified version of pb_url_join, to allow for the
44 * pxelinux "::filename" syntax for absolute URLs
46 static struct pb_url *pxe_url_join(void *ctx, const struct pb_url *url,
49 struct pb_url *new_url;
54 if (len > 2 && s[0] == ':' && s[1] == ':') {
58 /* ::/path -> /path */
59 tmp = talloc_strdup(ctx, s+2);
62 tmp = talloc_strdup(ctx, s+1);
66 new_url = pb_url_join(ctx, url, tmp);
72 /* strip leading slashes */
73 for (tmp = s; *tmp == '/'; tmp++)
75 new_url = pb_url_join(ctx, url, tmp);
81 static void pxe_append_string(struct discover_boot_option *opt,
84 if (opt->option->boot_args)
85 opt->option->boot_args = talloc_asprintf_append(
86 opt->option->boot_args, " %s", str);
88 opt->option->boot_args = talloc_strdup(opt->option, str);
91 static char *pxe_sysappend_mac(void *ctx, uint8_t *mac)
96 return talloc_asprintf(ctx,
97 "BOOTIF=01-%02x-%02x-%02x-%02x-%02x-%02x",
98 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
101 static void pxe_process_sysappend(struct discover_context *ctx,
102 struct discover_boot_option *opt,
105 struct event *event = ctx->event;
112 uint8_t *mac = find_mac_by_name(ctx,
113 device_handler_get_network(ctx->handler),
115 str = pxe_sysappend_mac(ctx, mac);
117 pxe_append_string(opt, str);
124 pb_log("pxe: unsupported features requested in "
125 "ipappend/sysappend: 0x%04lx", val);
129 static void pxe_process_pair(struct conf_context *ctx,
130 const char *name, char *value)
132 struct pxe_parser_info *parser_info = ctx->parser_info;
133 struct discover_boot_option *opt = parser_info->opt;
136 /* quirk in the syslinux config format: initrd can be separated
138 if (!name && !strncasecmp(value, "initrd=", strlen("initrd="))) {
140 value += strlen("initrd=");
146 if (streq(name, "DEFAULT")) {
147 parser_info->default_name = talloc_strdup(parser_info, value);
151 if (streq(name, "LABEL") || streq(name, "PLUGIN")) {
155 opt = discover_boot_option_create(ctx->dc, ctx->dc->device);
157 opt->option->name = talloc_strdup(opt, value);
158 opt->option->id = talloc_asprintf(opt, "%s@%p",
159 ctx->dc->device->device->id, opt);
161 if (streq(name, "LABEL")) {
162 opt->option->type = DISCOVER_BOOT_OPTION;
163 opt->option->is_default = parser_info->default_name &&
164 streq(parser_info->default_name, value);
166 opt->option->type = DISCOVER_PLUGIN_OPTION;
168 parser_info->opt = opt;
172 /* all other parameters need an option */
176 if (streq(name, "TARBALL") &&
177 opt->option->type == DISCOVER_PLUGIN_OPTION) {
178 url = pxe_url_join(ctx->dc, ctx->dc->conf_url, value);
179 opt->boot_image = create_url_resource(opt, url);
180 /* All other options apply to boot options only */
184 if (streq(name, "KERNEL")) {
185 url = pxe_url_join(ctx->dc, ctx->dc->conf_url, value);
186 opt->boot_image = create_url_resource(opt, url);
188 char* args_sigfile_default = talloc_asprintf(opt,
189 "%s.cmdline.sig", value);
190 url = pxe_url_join(ctx->dc, ctx->dc->conf_url,
191 args_sigfile_default);
192 opt->args_sig_file = create_url_resource(opt, url);
193 talloc_free(args_sigfile_default);
195 } else if (streq(name, "INITRD")) {
196 url = pxe_url_join(ctx->dc, ctx->dc->conf_url, value);
197 opt->initrd = create_url_resource(opt, url);
199 } else if (streq(name, "APPEND")) {
202 pxe_append_string(opt, value);
204 str = strcasestr(value, "INITRD=");
206 str += strlen("INITRD=");
207 end = strchrnul(str, ' ');
210 url = pxe_url_join(ctx->dc, ctx->dc->conf_url, str);
211 opt->initrd = create_url_resource(opt, url);
213 } else if (streq(name, "SYSAPPEND") || streq(name, "IPAPPEND")) {
217 type = strtoul(value, &end, 10);
218 if (end != value && !(*end))
219 pxe_process_sysappend(ctx->dc, opt, type);
221 } else if (streq(name, "DTB") || streq(name, "FDT")) {
222 url = pxe_url_join(ctx->dc, ctx->dc->conf_url, value);
223 opt->dtb = create_url_resource(opt, url);
227 static void pxe_load_next_filename(struct conf_context *conf)
229 struct pxe_parser_info *info = conf->parser_info;
232 if (!info->pxe_conf_files)
235 for (; info->pxe_conf_files[info->current]; info->current++) {
236 url = pb_url_join(conf->dc, info->pxe_base_url,
237 info->pxe_conf_files[info->current]);
241 if (load_url_async(conf, url, pxe_conf_parse_cb, conf,
250 * Callback for asynchronous loads from pxe_parse()
251 * @param result Result of load_url_async()
252 * @param data Pointer to associated conf_context
254 static void pxe_conf_parse_cb(struct load_url_result *result, void *data)
256 struct conf_context *conf = data;
257 struct device_handler *handler;
258 struct pxe_parser_info *info;
265 handler = talloc_parent(conf);
267 if (result && result->status == LOAD_OK)
268 rc = read_file(conf, result->local, &buf, &len);
269 if (!result || result->status != LOAD_OK || rc) {
270 /* This load failed so try the next available filename */
271 info = conf->parser_info;
272 if (!info->pxe_conf_files) {
273 device_handler_status_dev_err(handler,
275 _("Failed to download %s"),
276 pb_url_to_string(result->url));
282 pxe_load_next_filename(conf);
283 if (info->pxe_conf_files[info->current] == NULL) {
284 /* Nothing left to try */
285 device_handler_status_dev_err(handler,
287 _("PXE autoconfiguration failed"));
294 * Parse the first successfully downloaded file. We only want to parse
295 * the first because otherwise we could parse options from both a
296 * machine-specific config and a 'fallback' default config
299 conf_parse_buf(conf, buf, len);
301 /* We may be called well after the original caller of iterate_parsers(),
302 * commit any new boot options ourselves */
303 device_handler_discover_context_commit(handler, conf->dc);
306 * TRANSLATORS: the format specifier in this string is a URL
307 * eg. tftp://192.168.1.1/pxelinux.cfg
309 device_handler_status_dev_info(handler, conf->dc->device,
310 _("Parsed PXE config from %s"),
311 pb_url_to_string(result->url));
315 if (result->cleanup_local)
316 unlink(result->local);
321 * Return a new conf_context and increment the talloc reference count on
322 * the discover_context struct.
323 * @param ctx Parent talloc context
324 * @param orig Original discover_context
325 * @return Pointer to new conf_context
327 static struct conf_context *copy_context(void *ctx, struct discover_context *dc)
329 struct pxe_parser_info *info;
330 struct conf_context *conf;
332 conf = talloc_zero(ctx, struct conf_context);
337 conf->get_pair = conf_get_pair_space;
338 conf->process_pair = pxe_process_pair;
339 conf->finish = pxe_finish;
340 info = talloc_zero(conf, struct pxe_parser_info);
345 conf->parser_info = info;
348 * The discover_context may be freed once pxe_parse() returns, but the
349 * callback will still need it. Take a reference so that that it will
350 * persist until the last callback completes.
352 conf->dc = talloc_reference(conf, dc);
357 static int pxe_parse(struct discover_context *dc)
359 struct pb_url *pxe_base_url, *file_url;
360 struct conf_context *conf = NULL;
361 struct load_url_result *result;
362 void *ctx = talloc_parent(dc);
363 struct pxe_parser_info *info;
364 char **pxe_conf_files;
367 /* Expects dhcp event parameters to support network boot */
371 dc->conf_url = user_event_parse_conf_url(dc, dc->event, &complete_url);
376 * Retrieving PXE configs over the network can take some time depending
377 * on factors such as slow network, malformed paths, bad DNS, and
378 * overzealous firewalls. Instead of blocking the discover server while
379 * we wait for these, spawn an asynchronous job that will attempt to
380 * retrieve each possible URL until it successfully finds one, and
381 * parse and process the resulting file in a callback.
383 conf = copy_context(ctx, dc);
388 /* Check if this file has already been downloaded */
389 if (event_get_param(dc->event, "pxeconffile-local"))
390 file_url = pb_url_parse(dc, event_get_param(dc->event,
391 "pxeconffile-local"));
393 file_url = dc->conf_url;
396 pb_log("%s: Failed to parse conf url!\n", __func__);
400 device_handler_status_dev_info(conf->dc->handler,
402 _("Requesting config %s"),
403 pb_url_to_string(conf->dc->conf_url));
405 /* we have a complete URL; use this and we're done. */
406 result = load_url_async(conf->dc, file_url,
407 pxe_conf_parse_cb, conf, NULL, ctx);
409 pb_log("load_url_async fails for %s\n",
412 } else if (result->status == LOAD_OK) {
413 /* Local load - call pxe_conf_parse_cb() now */
414 pxe_conf_parse_cb(result, conf);
417 pxe_conf_files = user_event_parse_conf_filenames(dc, dc->event);
421 pxe_base_url = pb_url_join(dc, dc->conf_url, pxelinux_prefix);
425 info = conf->parser_info;
426 info->pxe_conf_files = pxe_conf_files;
427 info->pxe_base_url = pxe_base_url;
429 device_handler_status_dev_info(conf->dc->handler,
431 _("Probing from base %s"),
432 pb_url_to_string(pxe_base_url));
434 pxe_load_next_filename(conf);
440 talloc_free(pxe_conf_files);
446 static struct parser pxe_parser = {
451 register_parser(pxe_parser);