firewall3: add UBUS support for redirect sections
[project/firewall3.git] / main.c
diff --git a/main.c b/main.c
index 5580c7d..5888ab5 100644 (file)
--- a/main.c
+++ b/main.c
@@ -1,7 +1,7 @@
 /*
  * firewall3 - 3rd OpenWrt UCI firewall implementation
  *
- *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
+ *   Copyright (C) 2013-2014 Jo-Philipp Wich <jo@mein.io>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
 #include "zones.h"
 #include "rules.h"
 #include "redirects.h"
+#include "snats.h"
 #include "forwards.h"
 #include "ipsets.h"
 #include "includes.h"
 #include "ubus.h"
+#include "iptables.h"
 
 
-static bool print_rules = false;
+static enum fw3_family print_family = FW3_FAMILY_ANY;
 
 static struct fw3_state *run_state = NULL;
 static struct fw3_state *cfg_state = NULL;
@@ -43,12 +45,10 @@ build_state(bool runtime)
        struct uci_package *p = NULL;
        FILE *sf;
 
-       state = malloc(sizeof(*state));
-
+       state = calloc(1, sizeof(*state));
        if (!state)
                error("Out of memory");
 
-       memset(state, 0, sizeof(*state));
        state->uci = uci_alloc_context();
 
        if (!state->uci)
@@ -79,7 +79,7 @@ build_state(bool runtime)
        else
        {
                if (!fw3_ubus_connect())
-                       error("Failed to connect to ubus");
+                       warn("Failed to connect to ubus");
 
                if (uci_load(state->uci, "firewall", &p))
                {
@@ -96,11 +96,16 @@ build_state(bool runtime)
                cfg_state = state;
        }
 
+
+       struct blob_buf b = {NULL, NULL, 0, NULL};
+       fw3_ubus_rules(&b);
+
        fw3_load_defaults(state, p);
        fw3_load_ipsets(state, p);
        fw3_load_zones(state, p);
-       fw3_load_rules(state, p);
-       fw3_load_redirects(state, p);
+       fw3_load_rules(state, p, b.head);
+       fw3_load_redirects(state, p, b.head);
+       fw3_load_snats(state, p, b.head);
        fw3_load_forwards(state, p);
        fw3_load_includes(state, p);
 
@@ -121,6 +126,9 @@ free_state(struct fw3_state *state)
        list_for_each_safe(cur, tmp, &state->redirects)
                fw3_free_redirect((struct fw3_redirect *)cur);
 
+       list_for_each_safe(cur, tmp, &state->snats)
+               fw3_free_snat((struct fw3_snat *)cur);
+
        list_for_each_safe(cur, tmp, &state->forwards)
                fw3_free_forward((struct fw3_forward *)cur);
 
@@ -139,25 +147,6 @@ free_state(struct fw3_state *state)
 
 
 static bool
-restore_pipe(enum fw3_family family, bool silent)
-{
-       const char *cmd;
-
-       cmd = (family == FW3_FAMILY_V4) ? "iptables-restore" : "ip6tables-restore";
-
-       if (print_rules)
-               return fw3_stdout_pipe();
-
-       if (!fw3_command_pipe(silent, cmd, "--lenient", "--noflush"))
-       {
-               warn("Unable to execute %s", cmd);
-               return false;
-       }
-
-       return true;
-}
-
-static bool
 family_running(enum fw3_family family)
 {
        return (run_state && has(run_state->defaults.flags, family, family));
@@ -176,24 +165,22 @@ family_set(struct fw3_state *state, enum fw3_family family, bool set)
 }
 
 static int
-stop(bool complete, bool reload)
+stop(bool complete)
 {
-       FILE *ct;
-
        int rv = 1;
        enum fw3_family family;
        enum fw3_table table;
+       struct fw3_ipt_handle *handle;
 
        if (!complete && !run_state)
        {
-               if (!reload)
-                       warn("The firewall appears to be stopped. "
-                                "Use the 'flush' command to forcefully purge all rules.");
+               warn("The firewall appears to be stopped. "
+                        "Use the 'flush' command to forcefully purge all rules.");
 
                return rv;
        }
 
-       if (!print_rules && run_state)
+       if (!print_family && run_state)
                fw3_hotplug_zones(run_state, false);
 
        for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
@@ -201,61 +188,42 @@ stop(bool complete, bool reload)
                if (!complete && !family_running(family))
                        continue;
 
-               if (!restore_pipe(family, true))
-                       continue;
-
                for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
                {
                        if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
                                continue;
 
+                       if (!(handle = fw3_ipt_open(family, table)))
+                               continue;
+
                        info(" * %sing %s %s table", complete ? "Flush" : "Clear",
                             fw3_flag_names[family], fw3_flag_names[table]);
 
-                       fw3_pr("*%s\n", fw3_flag_names[table]);
-
                        if (complete)
                        {
-                               fw3_flush_all(table);
+                               fw3_flush_all(handle);
                        }
                        else if (run_state)
                        {
-                               /* pass 1 */
-                               fw3_flush_rules(run_state, family, table, reload, false);
-                               fw3_flush_zones(run_state, family, table, reload, false);
-
-                               /* pass 2 */
-                               fw3_flush_rules(run_state, family, table, reload, true);
-                               fw3_flush_zones(run_state, family, table, reload, true);
+                               fw3_flush_rules(handle, run_state, false);
+                               fw3_flush_zones(handle, run_state, false);
                        }
 
-                       fw3_pr("COMMIT\n");
+                       fw3_ipt_commit(handle);
+                       fw3_ipt_close(handle);
                }
 
-               fw3_command_close();
-
-               if (!reload && run_state)
-               {
-                       if (fw3_command_pipe(false, "ipset", "-exist", "-"))
-                       {
-                               fw3_destroy_ipsets(run_state, family);
-                               fw3_command_close();
-                       }
-
-                       family_set(run_state, family, false);
-                       family_set(cfg_state, family, false);
-               }
+               family_set(run_state, family, false);
+               family_set(cfg_state, family, false);
 
                rv = 0;
        }
 
-       if (complete && (ct = fopen("/proc/net/nf_conntrack", "w")) != NULL)
-       {
-               info(" * Flushing conntrack table ...");
+       if (run_state)
+               fw3_destroy_ipsets(run_state);
 
-               fwrite("f\n", 2, 1, ct);
-               fclose(ct);
-       }
+       if (complete)
+               fw3_flush_conntrack(NULL);
 
        if (!rv && run_state)
                fw3_write_statefile(run_state);
@@ -264,27 +232,25 @@ stop(bool complete, bool reload)
 }
 
 static int
-start(bool reload)
+start(void)
 {
        int rv = 1;
        enum fw3_family family;
        enum fw3_table table;
+       struct fw3_ipt_handle *handle;
 
-       if (!print_rules && !reload)
-       {
-               if (fw3_command_pipe(false, "ipset", "-exist", "-"))
-               {
-                       fw3_create_ipsets(cfg_state);
-                       fw3_command_close();
-               }
-       }
+       if (!print_family)
+               fw3_create_ipsets(cfg_state);
 
        for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
        {
                if (family == FW3_FAMILY_V6 && cfg_state->defaults.disable_ipv6)
                        continue;
 
-               if (!print_rules && !reload && family_running(family))
+               if (print_family && family != print_family)
+                       continue;
+
+               if (!print_family && family_running(family))
                {
                        warn("The %s firewall appears to be started already. "
                             "If it is indeed empty, remove the %s file and retry.",
@@ -293,32 +259,36 @@ start(bool reload)
                        continue;
                }
 
-               if (!restore_pipe(family, false))
-                       continue;
-
                for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
                {
                        if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
                                continue;
 
+                       if (!(handle = fw3_ipt_open(family, table)))
+                               continue;
+
                        info(" * Populating %s %s table",
                             fw3_flag_names[family], fw3_flag_names[table]);
 
-                       fw3_pr("*%s\n", fw3_flag_names[table]);
-                       fw3_print_default_chains(cfg_state, family, table, reload);
-                       fw3_print_zone_chains(cfg_state, family, table, reload);
-                       fw3_print_default_head_rules(cfg_state, family, table, reload);
-                       fw3_print_rules(cfg_state, family, table);
-                       fw3_print_redirects(cfg_state, family, table);
-                       fw3_print_forwards(cfg_state, family, table);
-                       fw3_print_zone_rules(cfg_state, family, table, reload);
-                       fw3_print_default_tail_rules(cfg_state, family, table, reload);
-                       fw3_pr("COMMIT\n");
+                       fw3_print_default_chains(handle, cfg_state, false);
+                       fw3_print_zone_chains(handle, cfg_state, false);
+                       fw3_print_default_head_rules(handle, cfg_state, false);
+                       fw3_print_rules(handle, cfg_state);
+                       fw3_print_redirects(handle, cfg_state);
+                       fw3_print_snats(handle, cfg_state);
+                       fw3_print_forwards(handle, cfg_state);
+                       fw3_print_zone_rules(handle, cfg_state, false);
+                       fw3_print_default_tail_rules(handle, cfg_state, false);
+
+                       if (!print_family)
+                               fw3_ipt_commit(handle);
+
+                       fw3_ipt_close(handle);
                }
 
-               fw3_print_includes(cfg_state, family, reload);
+               if (!print_family)
+                       fw3_print_includes(cfg_state, family, false);
 
-               fw3_command_close();
                family_set(run_state, family, true);
                family_set(cfg_state, family, true);
 
@@ -327,11 +297,12 @@ start(bool reload)
 
        if (!rv)
        {
+               fw3_flush_conntrack(run_state);
                fw3_set_defaults(cfg_state);
 
-               if (!print_rules)
+               if (!print_family)
                {
-                       fw3_run_includes(cfg_state, reload);
+                       fw3_run_includes(cfg_state, false);
                        fw3_hotplug_zones(cfg_state, true);
                        fw3_write_statefile(cfg_state);
                }
@@ -340,6 +311,124 @@ start(bool reload)
        return rv;
 }
 
+
+static int
+reload(void)
+{
+       int rv = 1;
+       enum fw3_family family;
+       enum fw3_table table;
+       struct fw3_ipt_handle *handle;
+
+       if (!run_state)
+               return start();
+
+       fw3_hotplug_zones(run_state, false);
+
+       for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
+       {
+               if (!family_running(family))
+                       goto start;
+
+               for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
+               {
+                       if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
+                               continue;
+
+                       if (!(handle = fw3_ipt_open(family, table)))
+                               continue;
+
+                       info(" * Clearing %s %s table",
+                            fw3_flag_names[family], fw3_flag_names[table]);
+
+                       fw3_flush_rules(handle, run_state, true);
+                       fw3_flush_zones(handle, run_state, true);
+                       fw3_ipt_commit(handle);
+                       fw3_ipt_close(handle);
+               }
+
+               family_set(run_state, family, false);
+               family_set(cfg_state, family, false);
+
+start:
+               if (family == FW3_FAMILY_V6 && cfg_state->defaults.disable_ipv6)
+                       continue;
+
+               for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
+               {
+                       if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
+                               continue;
+
+                       if (!(handle = fw3_ipt_open(family, table)))
+                               continue;
+
+                       info(" * Populating %s %s table",
+                            fw3_flag_names[family], fw3_flag_names[table]);
+
+                       fw3_print_default_chains(handle, cfg_state, true);
+                       fw3_print_zone_chains(handle, cfg_state, true);
+                       fw3_print_default_head_rules(handle, cfg_state, true);
+                       fw3_print_rules(handle, cfg_state);
+                       fw3_print_redirects(handle, cfg_state);
+                       fw3_print_snats(handle, cfg_state);
+                       fw3_print_forwards(handle, cfg_state);
+                       fw3_print_zone_rules(handle, cfg_state, true);
+                       fw3_print_default_tail_rules(handle, cfg_state, true);
+
+                       fw3_ipt_commit(handle);
+                       fw3_ipt_close(handle);
+               }
+
+               fw3_print_includes(cfg_state, family, true);
+
+               family_set(run_state, family, true);
+               family_set(cfg_state, family, true);
+
+               rv = 0;
+       }
+
+       if (!rv)
+       {
+               fw3_flush_conntrack(run_state);
+
+               fw3_set_defaults(cfg_state);
+               fw3_run_includes(cfg_state, true);
+               fw3_hotplug_zones(cfg_state, true);
+               fw3_write_statefile(cfg_state);
+       }
+
+       return rv;
+}
+
+static int
+gc(void)
+{
+       enum fw3_family family;
+       enum fw3_table table;
+       struct fw3_ipt_handle *handle;
+
+       for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
+       {
+               if (family == FW3_FAMILY_V6 && cfg_state->defaults.disable_ipv6)
+                       continue;
+
+               for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
+               {
+                       if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
+                               continue;
+
+                       if (!(handle = fw3_ipt_open(family, table)))
+                               continue;
+
+                       fw3_ipt_gc(handle);
+                       fw3_ipt_commit(handle);
+                       fw3_ipt_close(handle);
+               }
+       }
+
+       return 0;
+}
+
 static int
 lookup_network(const char *net)
 {
@@ -383,12 +472,42 @@ lookup_device(const char *dev)
 }
 
 static int
+lookup_zone(const char *zone, const char *device)
+{
+       struct fw3_zone *z;
+       struct fw3_device *d;
+
+       list_for_each_entry(z, &cfg_state->zones, list)
+       {
+               if (strcmp(z->name, zone))
+                       continue;
+
+               list_for_each_entry(d, &z->devices, list)
+               {
+                       if (device && strcmp(device, d->name))
+                               continue;
+
+                       printf("%s\n", d->name);
+
+                       if (device)
+                               return 0;
+               }
+
+               if (!device)
+                       return 0;
+       }
+
+       return 1;
+}
+
+static int
 usage(void)
 {
        fprintf(stderr, "fw3 [-4] [-6] [-q] print\n");
        fprintf(stderr, "fw3 [-q] {start|stop|flush|reload|restart}\n");
        fprintf(stderr, "fw3 [-q] network {net}\n");
        fprintf(stderr, "fw3 [-q] device {dev}\n");
+       fprintf(stderr, "fw3 [-q] zone {zone} [dev]\n");
 
        return 1;
 }
@@ -397,19 +516,19 @@ usage(void)
 int main(int argc, char **argv)
 {
        int ch, rv = 1;
+       enum fw3_family family = FW3_FAMILY_ANY;
        struct fw3_defaults *defs = NULL;
-       enum fw3_family use_family = FW3_FAMILY_ANY;
 
        while ((ch = getopt(argc, argv, "46dqh")) != -1)
        {
                switch (ch)
                {
                case '4':
-                       use_family = FW3_FAMILY_V4;
+                       family = FW3_FAMILY_V4;
                        break;
 
                case '6':
-                       use_family = FW3_FAMILY_V6;
+                       family = FW3_FAMILY_V6;
                        break;
 
                case 'd':
@@ -417,7 +536,7 @@ int main(int argc, char **argv)
                        break;
 
                case 'q':
-                       freopen("/dev/null", "w", stderr);
+                       if (freopen("/dev/null", "w", stderr)) {}
                        break;
 
                case 'h':
@@ -427,7 +546,6 @@ int main(int argc, char **argv)
        }
 
        build_state(false);
-       build_state(true);
        defs = &cfg_state->defaults;
 
        if (optind >= argc)
@@ -438,23 +556,39 @@ int main(int argc, char **argv)
 
        if (!strcmp(argv[optind], "print"))
        {
-               if (use_family == FW3_FAMILY_ANY)
-                       use_family = FW3_FAMILY_V4;
-               else if (use_family == FW3_FAMILY_V6 && defs->disable_ipv6)
-                       warn("IPv6 rules globally disabled in configuration");
+               if (family == FW3_FAMILY_ANY)
+               {
+                       family = FW3_FAMILY_V4;
+               }
+               else if (family == FW3_FAMILY_V6)
+               {
+                       if (defs->disable_ipv6)
+                               warn("IPv6 rules globally disabled in configuration");
+#ifdef DISABLE_IPV6
+                       else
+                               warn("IPv6 support is not compiled in");
+#endif
+               }
 
-               freopen("/dev/null", "w", stderr);
+               if (freopen("/dev/null", "w", stderr)) {};
 
                cfg_state->disable_ipsets = true;
-               print_rules = true;
+               print_family = family;
+               fw3_pr_debug = true;
 
-               rv = start(false);
+               if (fw3_lock())
+               {
+                       build_state(true);
+                       rv = start();
+                       fw3_unlock();
+               }
        }
        else if (!strcmp(argv[optind], "start"))
        {
                if (fw3_lock())
                {
-                       rv = start(false);
+                       build_state(true);
+                       rv = start();
                        fw3_unlock();
                }
        }
@@ -462,7 +596,8 @@ int main(int argc, char **argv)
        {
                if (fw3_lock())
                {
-                       rv = stop(false, false);
+                       build_state(true);
+                       rv = stop(false);
                        fw3_unlock();
                }
        }
@@ -470,7 +605,8 @@ int main(int argc, char **argv)
        {
                if (fw3_lock())
                {
-                       rv = stop(true, false);
+                       build_state(true);
+                       rv = stop(true);
                        fw3_unlock();
                }
        }
@@ -478,9 +614,9 @@ int main(int argc, char **argv)
        {
                if (fw3_lock())
                {
-                       stop(true, false);
-                       rv = start(false);
-
+                       build_state(true);
+                       stop(true);
+                       rv = start();
                        fw3_unlock();
                }
        }
@@ -488,9 +624,16 @@ int main(int argc, char **argv)
        {
                if (fw3_lock())
                {
-                       rv = stop(false, true);
-                       rv = start(!rv);
-
+                       build_state(true);
+                       rv = reload();
+                       fw3_unlock();
+               }
+       }
+       else if (!strcmp(argv[optind], "gc"))
+       {
+               if (fw3_lock())
+               {
+                       rv = gc();
                        fw3_unlock();
                }
        }
@@ -502,6 +645,10 @@ int main(int argc, char **argv)
        {
                rv = lookup_device(argv[optind + 1]);
        }
+       else if (!strcmp(argv[optind], "zone") && (optind + 1) < argc)
+       {
+               rv = lookup_zone(argv[optind + 1], argv[optind + 2]);
+       }
        else
        {
                rv = usage();