*/
#include "system.h"
+#include <pthread.h>
+#include "crypto.h"
+#include "ecdsagen.h"
#include "meshlink_internal.h"
+#include "node.h"
#include "protocol.h"
+#include "route.h"
#include "xalloc.h"
+meshlink_handle_t *mesh;
+
static const char *errstr[] = {
[MESHLINK_OK] = "No error",
[MESHLINK_ENOMEM] = "Out of memory",
return errstr[errno];
}
-static meshlink_handle_t *meshlink_setup(meshlink_handle_t *mesh) {
- return mesh;
+// TODO: hack, remove once all global variables are gone.
+static void set_mesh(meshlink_handle_t *localmesh) {
+ mesh = localmesh;
+}
+
+static bool ecdsa_keygen(meshlink_handle_t *mesh) {
+ ecdsa_t *key;
+ FILE *f;
+ char pubname[PATH_MAX], privname[PATH_MAX];
+
+ fprintf(stderr, "Generating ECDSA keypair:\n");
+
+ if(!(key = ecdsa_generate())) {
+ fprintf(stderr, "Error during key generation!\n");
+ return false;
+ } else
+ fprintf(stderr, "Done.\n");
+
+ snprintf(privname, sizeof privname, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
+ f = fopen(privname, "w");
+
+ if(!f)
+ return false;
+
+#ifdef HAVE_FCHMOD
+ fchmod(fileno(f), 0600);
+#endif
+
+ if(!ecdsa_write_pem_private_key(key, f)) {
+ fprintf(stderr, "Error writing private key!\n");
+ ecdsa_free(key);
+ fclose(f);
+ return false;
+ }
+
+ fclose(f);
+
+
+ snprintf(pubname, sizeof pubname, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
+ f = fopen(pubname, "a");
+
+ if(!f)
+ return false;
+
+ char *pubkey = ecdsa_get_base64_public_key(key);
+ fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
+ free(pubkey);
+
+ fclose(f);
+ ecdsa_free(key);
+
+ return true;
+}
+
+static bool try_bind(int port) {
+ struct addrinfo *ai = NULL;
+ struct addrinfo hint = {
+ .ai_flags = AI_PASSIVE,
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_STREAM,
+ .ai_protocol = IPPROTO_TCP,
+ };
+
+ char portstr[16];
+ snprintf(portstr, sizeof portstr, "%d", port);
+
+ if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
+ return false;
+
+ while(ai) {
+ int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
+ if(!fd)
+ return false;
+ int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
+ closesocket(fd);
+ if(result)
+ return false;
+ ai = ai->ai_next;
+ }
+
+ return true;
+}
+
+static int check_port(meshlink_handle_t *mesh) {
+ if(try_bind(655))
+ return 655;
+
+ fprintf(stderr, "Warning: could not bind to port 655.\n");
+
+ for(int i = 0; i < 100; i++) {
+ int port = 0x1000 + (rand() & 0x7fff);
+ if(try_bind(port)) {
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
+ FILE *f = fopen(filename, "a");
+ if(!f) {
+ fprintf(stderr, "Please change MeshLink's Port manually.\n");
+ return 0;
+ }
+
+ fprintf(f, "Port = %d\n", port);
+ fclose(f);
+ fprintf(stderr, "MeshLink will instead listen on port %d.\n", port);
+ return port;
+ }
+ }
+
+ fprintf(stderr, "Please change MeshLink's Port manually.\n");
+ return 0;
+}
+
+static bool meshlink_setup(meshlink_handle_t *mesh) {
+ char meshlink_conf[PATH_MAX];
+ char hosts_dir[PATH_MAX];
+
+ if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
+ return false;
+ }
+
+ snprintf(hosts_dir, sizeof hosts_dir, "%s" SLASH "hosts", mesh->confbase);
+
+ if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
+ return false;
+ }
+
+ snprintf(meshlink_conf, sizeof meshlink_conf, "%s" SLASH "meshlink.conf", mesh->confbase);
+
+ if(!access(meshlink_conf, F_OK)) {
+ fprintf(stderr, "Configuration file %s already exists!\n", meshlink_conf);
+ return false;
+ }
+
+ FILE *f = fopen(meshlink_conf, "w");
+ if(!f) {
+ fprintf(stderr, "Could not create file %s: %s\n", meshlink_conf, strerror(errno));
+ return 1;
+ }
+
+ fprintf(f, "Name = %s\n", mesh->name);
+ fclose(f);
+
+ if(!ecdsa_keygen(mesh))
+ return false;
+
+ check_port(mesh);
+
+ return true;
}
meshlink_handle_t *meshlink_open(const char *confbase, const char *name) {
+ // Validate arguments provided by the application
+
if(!confbase || !*confbase) {
fprintf(stderr, "No confbase given!\n");
return NULL;
meshlink_handle_t *mesh = xzalloc(sizeof *mesh);
mesh->confbase = xstrdup(confbase);
mesh->name = xstrdup(name);
+ event_loop_init(&mesh->loop);
+ set_mesh(mesh);
+
+ // TODO: should be set by a function.
+ mesh->debug_level = 5;
+
+ // Check whether meshlink.conf already exists
char filename[PATH_MAX];
snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", confbase);
- FILE *f = fopen(filename, "r");
+ if(access(filename, R_OK)) {
+ if(errno == ENOENT) {
+ // If not, create it
+ meshlink_setup(mesh);
+ } else {
+ fprintf(stderr, "Cannot not read from %s: %s\n", filename, strerror(errno));
+ return meshlink_close(mesh), NULL;
+ }
+ }
- if(!f && errno == ENOENT)
- return meshlink_setup(mesh);
+ // Read the configuration
- if(!f) {
- fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
- return meshlink_close(mesh), NULL;
- }
+ init_configuration(&mesh->config);
- char buf[1024] = "";
- if(!fgets(buf, sizeof buf, f)) {
- fprintf(stderr, "Could not read line from %s: %s\n", filename, strerror(errno));
- fclose(f);
+ if(!read_server_config(mesh))
return meshlink_close(mesh), NULL;
- }
-
- fclose(f);
- size_t len = strlen(buf);
- if(len && buf[len - 1] == '\n')
- buf[--len] = 0;
- if(len && buf[len - 1] == '\r')
- buf[--len] = 0;
+ // Setup up everything
+ // TODO: we should not open listening sockets yet
- if(strncmp(buf, "Name = ", 7) || !check_id(buf + 7)) {
- fprintf(stderr, "Could not read Name from %s\n", filename);
+ if(!setup_network(mesh))
return meshlink_close(mesh), NULL;
- }
- if(strcmp(buf + 7, name)) {
- fprintf(stderr, "Name in %s is %s, not the same as %s\n", filename, buf + 7, name);
- free(mesh->name);
- mesh->name = xstrdup(buf + 7);
- }
+ return mesh;
+}
- snprintf(filename, sizeof filename, "%s" SLASH "ed25519_key.priv", mesh->confbase);
- f = fopen(filename, "r");
- if(!f) {
- fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
- return meshlink_close(mesh), NULL;
- }
+void *meshlink_main_loop(void *arg) {
+ meshlink_handle_t *mesh = arg;
- mesh->self->ecdsa = ecdsa_read_pem_private_key(f);
- fclose(f);
+ try_outgoing_connections();
- if(!mesh->self->ecdsa) {
- fprintf(stderr, "Could not read keypair!\n");
- return meshlink_close(mesh), NULL;
- }
+ main_loop();
- return mesh;
+ return NULL;
}
bool meshlink_start(meshlink_handle_t *mesh) {
- return false;
+ // TODO: open listening sockets first
+
+ // Start the main thread
+
+ if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
+ fprintf(stderr, "Could not start thread: %s\n", strerror(errno));
+ memset(&mesh->thread, 0, sizeof mesh->thread);
+ return false;
+ }
+
+ return true;
}
void meshlink_stop(meshlink_handle_t *mesh) {
+ // TODO: close the listening sockets to signal the main thread to shut down
+
+ // Wait for the main thread to finish
+
+ pthread_join(mesh->thread, NULL);
}
void meshlink_close(meshlink_handle_t *mesh) {
+ // Close and free all resources used.
+
+ close_network_connections();
+
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
+
+ exit_configuration(&mesh->config);
+ event_loop_exit(&mesh->loop);
}
void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
}
bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, unsigned int len) {
+ vpn_packet_t packet;
+ meshlink_packethdr_t *hdr = (meshlink_packethdr_t *)packet.data;
+ if (sizeof(meshlink_packethdr_t) + len > MAXSIZE) {
+ //log something
+ return false;
+ }
+
+ packet.probe = false;
+ memset(hdr, 0, sizeof *hdr);
+ memcpy(hdr->destination, destination->name, sizeof hdr->destination);
+ memcpy(hdr->source, mesh->self->name, sizeof hdr->source);
+
+ packet.len = sizeof *hdr + len;
+ memcpy(packet.data + sizeof *hdr, data, len);
+
+ mesh->self->in_packets++;
+ mesh->self->in_bytes += packet.len;
+ route(mesh->self, &packet);
return false;
}
meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
+ return (meshlink_node_t *)lookup_node(name);
return NULL;
}
void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
}
+static void __attribute__((constructor)) meshlink_init(void) {
+ crypto_init();
+}
+
+static void __attribute__((destructor)) meshlink_exit(void) {
+ crypto_exit();
+}
projects / meshlink / blobdiff