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#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif
#include <string.h>
#include <talloc/talloc.h>
#include <url/url.h>
#include "parser.h"
#include "parser-conf.h"
#include "parser-utils.h"
#include "resource.h"
#include "paths.h"
#include "user-event.h"
static const char *pxelinux_prefix = "pxelinux.cfg/";
struct pxe_parser_info {
struct discover_boot_option *opt;
const char *default_name;
};
static void pxe_finish(struct conf_context *conf)
{
struct pxe_parser_info *info = conf->parser_info;
if (info->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_process_pair(struct conf_context *ctx,
const char *name, char *value)
{
struct pxe_parser_info *parser_info = ctx->parser_info;
struct discover_boot_option *opt = parser_info->opt;
struct pb_url *url;
/* quirk in the syslinux config format: initrd can be separated
* by an '=' */
if (!name && !strncasecmp(value, "initrd=", strlen("initrd="))) {
name = "initrd";
value += strlen("initrd=");
}
if (!name)
return;
if (streq(name, "DEFAULT")) {
parser_info->default_name = talloc_strdup(parser_info, value);
return;
}
if (streq(name, "LABEL")) {
if (opt)
pxe_finish(ctx);
opt = discover_boot_option_create(ctx->dc, ctx->dc->device);
opt->option->name = talloc_strdup(opt, value);
opt->option->id = talloc_asprintf(opt, "%s@%p",
ctx->dc->device->device->id, opt);
opt->option->is_default = parser_info->default_name &&
streq(parser_info->default_name, value);
parser_info->opt = opt;
return;
}
/* all other parameters need an option */
if (!opt)
return;
if (streq(name, "KERNEL")) {
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 = 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);
str = strcasestr(value, "INITRD=");
if (str) {
str += strlen("INITRD=");
end = strchrnul(str, ' ');
*end = '\0';
url = pxe_url_join(ctx->dc, ctx->dc->conf_url, str);
opt->initrd = create_url_resource(opt, url);
}
}
}
static int pxe_parse(struct discover_context *dc)
{
struct pb_url *pxe_base_url, *url;
struct pxe_parser_info *parser_info;
char **pxe_conf_files, **filename;
struct conf_context *conf;
bool complete_url;
int len, rc;
char *buf;
/* Expects dhcp event parameters to support network boot */
if (!dc->event)
return -1;
conf = talloc_zero(dc, struct conf_context);
if (!conf)
goto out;
conf->dc = dc;
conf->get_pair = conf_get_pair_space;
conf->process_pair = pxe_process_pair;
conf->finish = pxe_finish;
parser_info = talloc_zero(conf, struct pxe_parser_info);
conf->parser_info = parser_info;
dc->conf_url = user_event_parse_conf_url(dc, dc->event, &complete_url);
if (!dc->conf_url)
goto out_conf;
if (complete_url) {
/* we have a complete URL; use this and we're done. */
rc = parser_request_url(dc, dc->conf_url, &buf, &len);
if (rc)
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, pxe_base_url, *filename);
if (!url)
continue;
rc = parser_request_url(dc, url, &buf, &len);
if (!rc) /* found one, just break */
break;
talloc_free(url);
}
talloc_free(pxe_base_url);
/* No configuration file found on the boot server */
if (rc)
goto out_pxe_conf;
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;
}
static struct parser pxe_parser = {
.name = "pxe",
.parse = pxe_parse,
};
register_parser(pxe_parser);
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