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#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "types/types.h"
#include <log/log.h>
#include <talloc/talloc.h>
#include "device-handler.h"
#include "parser.h"
#include "parser-utils.h"
#include "paths.h"
static int n_parsers;
static struct parser **parsers;
static const int max_file_size = 1024 * 1024;
static int read_file(struct discover_context *ctx,
const char *filename, char **bufp, int *lenp)
{
struct stat statbuf;
int rc, fd, i, len;
char *buf;
fd = open(filename, O_RDONLY);
if (fd < 0)
return -1;
rc = fstat(fd, &statbuf);
if (rc < 0)
goto err_close;
len = statbuf.st_size;
if (len > max_file_size)
goto err_close;
buf = talloc_array(ctx, char, len);
if (!buf)
goto err_close;
for (i = 0; i < len; i += rc) {
rc = read(fd, buf + i, len - i);
/* unexpected EOF: trim and return */
if (rc == 0) {
len = i;
break;
}
if (rc < 0)
goto err_free;
}
close(fd);
*bufp = buf;
*lenp = len;
return 0;
err_free:
talloc_free(buf);
err_close:
close(fd);
return -1;
}
static char *local_path(struct discover_context *ctx,
const char *filename)
{
return join_paths(ctx, ctx->device->mount_path, filename);
}
static int download_config(struct discover_context *ctx, char **buf, int *len)
{
unsigned tempfile;
const char *file;
int rc;
file = load_url(ctx, ctx->conf_url, &tempfile);
if (!file)
return -1;
rc = read_file(ctx, file, buf, len);
if (rc)
goto out_clean;
return 0;
out_clean:
if (tempfile)
unlink(file);
return -1;
}
static void iterate_parser_files(struct discover_context *ctx,
const struct parser *parser)
{
const char * const *filename;
const char *path;
if (!parser->filenames)
return;
for (filename = parser->filenames; *filename; filename++) {
int rc, len;
char *buf;
path = local_path(ctx, *filename);
if (!path)
continue;
rc = read_file(ctx, path, &buf, &len);
if (!rc) {
parser->parse(ctx, buf, len);
talloc_free(buf);
}
}
}
void iterate_parsers(struct discover_context *ctx, enum conf_method method)
{
int rc, i, len;
char *buf;
pb_log("trying parsers for %s\n", ctx->device->device->id);
switch (method) {
case CONF_METHOD_LOCAL_FILE:
for (i = 0; i < n_parsers; i++) {
if (parsers[i]->method != CONF_METHOD_LOCAL_FILE)
continue;
pb_log("\ttrying parser '%s'\n", parsers[i]->name);
ctx->parser = parsers[i];
iterate_parser_files(ctx, ctx->parser);
}
ctx->parser = NULL;
break;
case CONF_METHOD_DHCP:
rc = download_config(ctx, &buf, &len);
if (rc)
return;
for (i = 0; i < n_parsers; i++) {
if (parsers[i]->method != method)
continue;
pb_log("\ttrying parser '%s'\n", parsers[i]->name);
ctx->parser = parsers[i];
parsers[i]->parse(ctx, buf, len);
}
break;
case CONF_METHOD_UNKNOWN:
break;
}
}
void __register_parser(struct parser *parser)
{
parsers = talloc_realloc(NULL, parsers, struct parser *, n_parsers + 1);
parsers[n_parsers] = parser;
n_parsers++;
}
void parser_init(void)
{
}
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