+bool system_resolve_rt_table(const char *name, unsigned int *id)
+{
+ FILE *f;
+ char *e, buf[128];
+ unsigned int n, table = RT_TABLE_UNSPEC;
+
+ /* first try to parse table as number */
+ if ((n = strtoul(name, &e, 0)) > 0 && !*e)
+ table = n;
+
+ /* handle well known aliases */
+ else if (!strcmp(name, "default"))
+ table = RT_TABLE_DEFAULT;
+ else if (!strcmp(name, "main"))
+ table = RT_TABLE_MAIN;
+ else if (!strcmp(name, "local"))
+ table = RT_TABLE_LOCAL;
+
+ /* try to look up name in /etc/iproute2/rt_tables */
+ else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
+ {
+ while (fgets(buf, sizeof(buf) - 1, f) != NULL)
+ {
+ if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
+ continue;
+
+ n = strtoul(e, NULL, 10);
+ e = strtok(NULL, " \t\n");
+
+ if (e && !strcmp(e, name))
+ {
+ table = n;
+ break;
+ }
+ }
+
+ fclose(f);
+ }
+
+ if (table == RT_TABLE_UNSPEC)
+ return false;
+
+ /* do not consider main table special */
+ if (table == RT_TABLE_MAIN)
+ table = RT_TABLE_UNSPEC;
+
+ *id = table;
+ return true;
+}
+