X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/c5e4c2cfc092317c1e3ceb0f654f880f6a8573f4..99be8b127a607ddf8da0f77dcffd52d50a3b0613:/garden.c?ds=inline diff --git a/garden.c b/garden.c index 064bea2..89cc78d 100644 --- a/garden.c +++ b/garden.c @@ -7,32 +7,45 @@ #include "plugin.h" #include "control.h" -int __plugin_api_version = 1; -struct pluginfuncs p; - -int garden_session(sessiont *s, int flag); +char const *cvs_id = "$Id: garden.c,v 1.8 2004-10-30 07:35:31 bodea Exp $"; -char *init_commands[] = { - // This is for incoming connections to a gardened user - "iptables -t nat -N garden_users 2>&1 >/dev/null", - "iptables -t nat -F garden_users 2>&1 >/dev/null", - "iptables -t nat -N garden 2>&1 >/dev/null", - "iptables -t nat -A l2tpns -j garden_users", - NULL +int __plugin_api_version = 1; +static struct pluginfuncs *p = 0; + +static int iam_master = 0; // We're all slaves! Slaves I tell you! + +char *up_commands[] = { + "iptables -t nat -N garden >/dev/null 2>&1", // Create a chain that all gardened users will go through + "iptables -t nat -F garden", + ". " PLUGINCONF "/build-garden", // Populate with site-specific DNAT rules + "iptables -t nat -N garden_users >/dev/null 2>&1", // Empty chain, users added/removed by garden_session + "iptables -t nat -F garden_users", + "iptables -t nat -A PREROUTING -j garden_users", // DNAT any users on the garden_users chain + "sysctl -w net.ipv4.ip_conntrack_max=256000 >/dev/null", // lots of entries + NULL, }; -char *done_commands[] = { - "iptables -t nat -F garden_users 2>&1 >/dev/null", - "iptables -t nat -D l2tpns -j garden_users 2>&1 >/dev/null", - NULL +char *down_commands[] = { + "iptables -t nat -F PREROUTING", + "iptables -t nat -F garden_users", + "iptables -t nat -X garden_users", + "iptables -t nat -F garden", + "iptables -t nat -X garden", + "rmmod iptable_nat", // Should also remove ip_conntrack, but + // doing so can take hours... literally. + // If a master is re-started as a slave, + // either rmmod manually, or reboot. + NULL, }; +int garden_session(sessiont *s, int flag); + int plugin_post_auth(struct param_post_auth *data) { // Ignore if user authentication was successful if (data->auth_allowed) return PLUGIN_RET_OK; - p.log(3, 0, 0, 0, "User allowed into walled garden\n"); + p->log(3, 0, 0, 0, "Walled Garden allowing login\n"); data->auth_allowed = 1; data->s->walled_garden = 1; return PLUGIN_RET_OK; @@ -40,13 +53,23 @@ int plugin_post_auth(struct param_post_auth *data) int plugin_new_session(struct param_new_session *data) { - if (data->s->walled_garden) garden_session(data->s, 1); + if (!iam_master) + return PLUGIN_RET_OK; // Slaves don't do walled garden processing. + + if (data->s->walled_garden) + garden_session(data->s, 1); + return PLUGIN_RET_OK; } int plugin_kill_session(struct param_new_session *data) { - if (data->s->walled_garden) garden_session(data->s, 0); + if (!iam_master) + return PLUGIN_RET_OK; // Slaves don't do walled garden processing. + + if (data->s->walled_garden) + garden_session(data->s, 0); + return PLUGIN_RET_OK; } @@ -55,15 +78,21 @@ int plugin_control(struct param_control *data) sessiont *s; sessionidt session; - if (data->type != PKT_GARDEN && data->type != PKT_UNGARDEN) return PLUGIN_RET_OK; - if (!data->data && data->data_length) return PLUGIN_RET_OK; - session = atoi((char*)(data->data)); + if (!iam_master) // All garden processing happens on the master. + return PLUGIN_RET_OK; + + if (data->type != PKT_GARDEN && data->type != PKT_UNGARDEN) + return PLUGIN_RET_OK; + if (!data->data && data->data_length) + return PLUGIN_RET_OK; + + session = atoi((char*)(data->data)); if (!session) return PLUGIN_RET_OK; data->send_response = 1; - s = p.get_session_by_id(session); + s = p->get_session_by_id(session); if (!s || !s->ip) { char *errormsg = "Session not connected"; @@ -71,7 +100,7 @@ int plugin_control(struct param_control *data) sprintf((data->response + data->response_length), "%s", errormsg); data->response_length += strlen(errormsg) + 1; - p.log(3, 0, 0, 0, "Unknown session %s\n", session); + p->log(3, 0, 0, 0, "Unknown session %d\n", session); return PLUGIN_RET_STOP; } *(short *)(data->response + 2) = ntohs(PKT_RESP_OK); @@ -83,11 +112,30 @@ int plugin_control(struct param_control *data) sprintf((data->response + data->response_length), "%s", errormsg); data->response_length += strlen(errormsg) + 1; } + return PLUGIN_RET_STOP; } -int plugin_config(struct param_config *data) +int plugin_become_master(void) { + int i; + iam_master = 1; // We just became the master. Wow! + + for (i = 0; up_commands[i] && *up_commands[i]; i++) + { + p->log(3, 0, 0, 0, "Running %s\n", up_commands[i]); + system(up_commands[i]); + } + + return PLUGIN_RET_OK; +} + +// Called for each active session after becoming master +int plugin_new_session_master(sessiont * s) +{ + if (s->walled_garden) + garden_session(s, 1); + return PLUGIN_RET_OK; } @@ -100,30 +148,30 @@ int garden_session(sessiont *s, int flag) if (flag == 1) { - p.log(2, 0, 0, s->tunnel, "Trap user %s (%s) in walled garden\n", s->user, p.inet_toa(ntohl(s->ip))); - snprintf(cmd, 2048, "iptables -t nat -A garden_users -s %s -j garden", p.inet_toa(ntohl(s->ip))); - p.log(3, 0, 0, s->tunnel, "%s\n", cmd); + p->log(2, 0, 0, s->tunnel, "Garden user %s (%s)\n", s->user, p->inet_toa(htonl(s->ip))); + snprintf(cmd, sizeof(cmd), "iptables -t nat -A garden_users -s %s -j garden", p->inet_toa(htonl(s->ip))); + p->log(3, 0, 0, s->tunnel, "%s\n", cmd); system(cmd); s->walled_garden = 1; } else { sessionidt other; - int count = 10; + int count = 40; // Normal User - p.log(2, 0, 0, s->tunnel, "Release user %s (%s) from walled garden\n", s->user, p.inet_toa(ntohl(s->ip))); + p->log(2, 0, 0, s->tunnel, "Un-Garden user %s (%s)\n", s->user, p->inet_toa(htonl(s->ip))); // Kick off any duplicate usernames // but make sure not to kick off ourself - if (s->ip && !s->die && (other = p.get_session_by_username(s->user)) && s != p.get_session_by_id(other)) { - p.sessionkill(other, "Duplicate session when user ungardened"); + if (s->ip && !s->die && (other = p->get_session_by_username(s->user)) && s != p->get_session_by_id(other)) { + p->sessionkill(other, "Duplicate session when user released from walled garden"); } /* Clean up counters */ s->cin = s->cout = 0; s->pin = s->pout = 0; - snprintf(cmd, 2048, "iptables -t nat -D garden_users -s %s -j garden", p.inet_toa(ntohl(s->ip))); - p.log(3, 0, 0, s->tunnel, "%s\n", cmd); + snprintf(cmd, sizeof(cmd), "iptables -t nat -D garden_users -s %s -j garden", p->inet_toa(htonl(s->ip))); + p->log(3, 0, 0, s->tunnel, "%s\n", cmd); while (--count) { int status = system(cmd); @@ -134,8 +182,8 @@ int garden_session(sessiont *s, int flag) if (!s->die) { /* OK, we're up! */ - u8 r = p.radiusnew(p.get_id_by_session(s)); - p.radiussend(r, RADIUSSTART); + u16 r = p->radiusnew(p->get_id_by_session(s)); + p->radiussend(r, RADIUSSTART); } } s->walled_garden = flag; @@ -144,17 +192,32 @@ int garden_session(sessiont *s, int flag) int plugin_init(struct pluginfuncs *funcs) { - int i; + FILE *tables; + int found_nat = 0; - if (!funcs) return 0; - memcpy(&p, funcs, sizeof(p)); + if (!funcs) + return 0; - p.log(1, 0, 0, 0, "Enabling walled garden service\n"); + p = funcs; - for (i = 0; init_commands[i] && *init_commands[i]; i++) + if ((tables = fopen("/proc/net/ip_tables_names", "r"))) { - p.log(4, 0, 0, 0, "Running %s\n", init_commands[i]); - system(init_commands[i]); + char buf[1024]; + while (fgets(buf, sizeof(buf), tables) && !found_nat) + found_nat = !strcmp(buf, "nat\n"); + + fclose(tables); + } + + /* master killed/crashed? */ + if (found_nat) + { + int i; + for (i = 0; down_commands[i] && *down_commands[i]; i++) + { + p->log(3, 0, 0, 0, "Running %s\n", down_commands[i]); + system(down_commands[i]); + } } return 1; @@ -163,10 +226,14 @@ int plugin_init(struct pluginfuncs *funcs) void plugin_done() { int i; - for (i = 0; done_commands[i] && *done_commands[i]; i++) + + if (!iam_master) // Never became master. nothing to do. + return; + + for (i = 0; down_commands[i] && *down_commands[i]; i++) { - p.log(4, 0, 0, 0, "Running %s\n", done_commands[i]); - system(done_commands[i]); + p->log(3, 0, 0, 0, "Running %s\n", down_commands[i]); + system(down_commands[i]); } }