Port the blackbox meta-connections test using network namespaces.

[meshlink] / test / netns_utils.c

diff --git a/test/netns_utils.c b/test/netns_utils.c
new file mode 100644 (file)
index 0000000..d957d5b
--- /dev/null
+++ b/test/netns_utils.c
@@ -0,0 +1,148 @@
+#define _GNU_SOURCE 1
+
+#ifndef NDEBUG
+#undef NDEBUG
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "../src/meshlink.h"
+#include "netns_utils.h"
+#include "utils.h"
+
+static int ip = 1;
+
+/// Create meshlink instances and network namespaces for a list of peers
+static void create_peers(peer_config_t *peers, int npeers, const char *prefix) {
+       // We require root for network namespaces
+       if(getuid() != 0) {
+               exit(77);
+       }
+
+       for(int i = 0; i < npeers; i++) {
+               assert(asprintf(&peers[i].netns_name, "%s%d", prefix, i) > 0);
+               char *command = NULL;
+               assert(asprintf(&command,
+                               "/bin/ip netns delete %1$s 2>/dev/null || true;"
+                               "/bin/ip netns add %1$s;"
+                               "/bin/ip netns exec %1$s ip link set dev lo up;",
+                               peers[i].netns_name));
+               assert(command);
+               assert(system(command) == 0);
+               free(command);
+
+               char *netns_path = NULL;
+               assert(asprintf(&netns_path, "/run/netns/%s", peers[i].netns_name));
+               assert(netns_path);
+               peers[i].netns = open(netns_path, O_RDONLY);
+               assert(peers[i].netns != -1);
+               free(netns_path);
+
+               char *conf_path = NULL;
+               assert(asprintf(&conf_path, "%s_conf.%d", prefix, i + 1) > 0);
+               assert(conf_path);
+               assert(meshlink_destroy(conf_path));
+
+               meshlink_open_params_t *params = meshlink_open_params_init(conf_path, peers[i].name, prefix, peers[i].devclass);
+               assert(params);
+               assert(meshlink_open_params_set_netns(params, peers[i].netns));
+
+               peers[i].mesh = meshlink_open_ex(params);
+               assert(peers[i].mesh);
+               free(params);
+               free(conf_path);
+
+               meshlink_enable_discovery(peers[i].mesh, false);
+       }
+}
+
+/// Set up a LAN topology where all peers can see each other directly
+static void setup_lan_topology(peer_config_t *peers, int npeers) {
+       // Set up the LAN bridge
+       {
+               char *command = NULL;
+               assert(asprintf(&command,
+                               "/bin/ip netns exec %1$s /bin/ip link add eth0 type bridge;"
+                               "/bin/ip netns exec %1$s /bin/ip link set eth0 up;",
+                               peers[0].netns_name));
+               assert(command);
+               assert(system(command) == 0);
+       }
+
+       // Add an interface to each peer that is connected to the bridge
+       for(int i = 1; i < npeers; i++) {
+               char *command = NULL;
+               assert(asprintf(&command,
+                               "/bin/ip netns exec %1$s /bin/ip link add eth0 type veth peer eth%3$d netns %2$s;"
+                               "/bin/ip netns exec %1$s /bin/ip link set dev eth0 up;"
+                               "/bin/ip netns exec %2$s /bin/ip link set dev eth%3$d master eth0 up;",
+                               peers[i].netns_name, peers[0].netns_name, i));
+               assert(command);
+               assert(system(command) == 0);
+               free(command);
+       }
+
+       // Configure addresses
+       for(int i = 0; i < npeers; i++) {
+               change_peer_ip(&peers[i]);
+       }
+}
+
+/// Give a peer a unique IP address
+void change_peer_ip(peer_config_t *peer) {
+       char *command = NULL;
+       assert(asprintf(&command,
+                       "/bin/ip netns exec %1$s ip addr flush dev eth0;"
+                       "/bin/ip netns exec %1$s ip addr add 203.0.113.%2$d/24 dev eth0;",
+                       peer->netns_name, ip));
+       ip++;
+       assert(command);
+       assert(system(command) == 0);
+       free(command);
+}
+
+/// Let the first peer in a list invite all the subsequent peers
+static void invite_peers(peer_config_t *peers, int npeers) {
+       assert(meshlink_start(peers[0].mesh));
+
+       for(int i = 1; i < npeers; i++) {
+               char *invitation = meshlink_invite_ex(peers[0].mesh, NULL, peers[i].name, MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_NUMERIC);
+               assert(invitation);
+               assert(meshlink_join(peers[i].mesh, invitation));
+               free(invitation);
+       }
+
+       meshlink_stop(peers[0].mesh);
+}
+
+/// Close meshlink instances and clean up
+static void close_peers(peer_config_t *peers, int npeers) {
+       for(int i = 0; i < npeers; i++) {
+               meshlink_close(peers[i].mesh);
+               close(peers[i].netns);
+               free(peers[i].netns_name);
+       }
+}
+
+/// Set up relay, peer and NUT that are directly connected
+peer_config_t *setup_relay_peer_nut(const char *prefix) {
+       static peer_config_t peers[] = {
+               {"relay", DEV_CLASS_BACKBONE},
+               {"peer", DEV_CLASS_STATIONARY},
+               {"nut", DEV_CLASS_STATIONARY},
+       };
+
+       create_peers(peers, 3, prefix);
+       setup_lan_topology(peers, 3);
+       invite_peers(peers, 3);
+
+       return peers;
+}
+
+void close_relay_peer_nut(peer_config_t *peers) {
+       close_peers(peers, 3);
+}