with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#define VAR_SERVER 1 /* Should be in meshlink.conf */
+#define VAR_HOST 2 /* Can be in host config file */
+#define VAR_MULTIPLE 4 /* Multiple statements allowed */
+#define VAR_OBSOLETE 8 /* Should not be used anymore */
+#define VAR_SAFE 16 /* Variable is safe when accepting invitations */
+typedef struct {
+ const char *name;
+ int type;
+} var_t;
#include "system.h"
+#include <pthread.h>
+#include "crypto.h"
+#include "ecdsagen.h"
#include "meshlink_internal.h"
+#include "netutl.h"
+#include "node.h"
#include "protocol.h"
+#include "route.h"
+#include "utils.h"
#include "xalloc.h"
+#include "ed25519/sha512.h"
-static const char *errstr[] = {
- [MESHLINK_OK] = "No error",
- [MESHLINK_ENOMEM] = "Out of memory",
- [MESHLINK_ENOENT] = "No such node",
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
+
+__thread meshlink_errno_t meshlink_errno;
+
+//TODO: this can go away completely
+const var_t variables[] = {
+ /* Server configuration */
+ {"AddressFamily", VAR_SERVER},
+ {"AutoConnect", VAR_SERVER | VAR_SAFE},
+ {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
+ {"BindToInterface", VAR_SERVER},
+ {"Broadcast", VAR_SERVER | VAR_SAFE},
+ {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
+ {"DecrementTTL", VAR_SERVER},
+ {"Device", VAR_SERVER},
+ {"DeviceType", VAR_SERVER},
+ {"DirectOnly", VAR_SERVER},
+ {"ECDSAPrivateKeyFile", VAR_SERVER},
+ {"ExperimentalProtocol", VAR_SERVER},
+ {"Forwarding", VAR_SERVER},
+ {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
+ {"Hostnames", VAR_SERVER},
+ {"IffOneQueue", VAR_SERVER},
+ {"Interface", VAR_SERVER},
+ {"KeyExpire", VAR_SERVER},
+ {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
+ {"LocalDiscovery", VAR_SERVER},
+ {"MACExpire", VAR_SERVER},
+ {"MaxConnectionBurst", VAR_SERVER},
+ {"MaxOutputBufferSize", VAR_SERVER},
+ {"MaxTimeout", VAR_SERVER},
+ {"Mode", VAR_SERVER | VAR_SAFE},
+ {"Name", VAR_SERVER},
+ {"PingInterval", VAR_SERVER},
+ {"PingTimeout", VAR_SERVER},
+ {"PriorityInheritance", VAR_SERVER},
+ {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
+ {"PrivateKeyFile", VAR_SERVER},
+ {"ProcessPriority", VAR_SERVER},
+ {"Proxy", VAR_SERVER},
+ {"ReplayWindow", VAR_SERVER},
+ {"ScriptsExtension", VAR_SERVER},
+ {"ScriptsInterpreter", VAR_SERVER},
+ {"StrictSubnets", VAR_SERVER},
+ {"TunnelServer", VAR_SERVER},
+ {"VDEGroup", VAR_SERVER},
+ {"VDEPort", VAR_SERVER},
+ /* Host configuration */
+ {"Address", VAR_HOST | VAR_MULTIPLE},
+ {"Cipher", VAR_SERVER | VAR_HOST},
+ {"ClampMSS", VAR_SERVER | VAR_HOST},
+ {"Compression", VAR_SERVER | VAR_HOST},
+ {"Digest", VAR_SERVER | VAR_HOST},
+ {"ECDSAPublicKey", VAR_HOST},
+ {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
+ {"IndirectData", VAR_SERVER | VAR_HOST},
+ {"MACLength", VAR_SERVER | VAR_HOST},
+ {"PMTU", VAR_SERVER | VAR_HOST},
+ {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
+ {"Port", VAR_HOST},
+ {"PublicKey", VAR_HOST | VAR_OBSOLETE},
+ {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
+ {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
+ {"TCPOnly", VAR_SERVER | VAR_HOST},
+ {"Weight", VAR_HOST | VAR_SAFE},
+ {NULL, 0}
};
-const char *meshlink_strerror(meshlink_errno_t errno) {
- return errstr[errno];
+static bool fcopy(FILE *out, const char *filename) {
+ FILE *in = fopen(filename, "r");
+ if(!in) {
+ fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ char buf[1024];
+ size_t len;
+ while((len = fread(buf, 1, sizeof buf, in)))
+ fwrite(buf, len, 1, out);
+ fclose(in);
+ return true;
}
-static meshlink_handle_t *meshlink_setup(meshlink_handle_t *mesh) {
- return mesh;
+static int rstrip(char *value) {
+ int len = strlen(value);
+ while(len && strchr("\t\r\n ", value[len - 1]))
+ value[--len] = 0;
+ return len;
}
-meshlink_handle_t *meshlink_open(const char *confbase, const char *name) {
- if(!confbase || !*confbase) {
- fprintf(stderr, "No confbase given!\n");
+static void scan_for_hostname(const char *filename, char **hostname, char **port) {
+ char line[4096];
+ if(!filename || (*hostname && *port))
+ return;
+
+ FILE *f = fopen(filename, "r");
+ if(!f)
+ return;
+
+ while(fgets(line, sizeof line, f)) {
+ if(!rstrip(line))
+ continue;
+ char *p = line, *q;
+ p += strcspn(p, "\t =");
+ if(!*p)
+ continue;
+ q = p + strspn(p, "\t ");
+ if(*q == '=')
+ q += 1 + strspn(q + 1, "\t ");
+ *p = 0;
+ p = q + strcspn(q, "\t ");
+ if(*p)
+ *p++ = 0;
+ p += strspn(p, "\t ");
+ p[strcspn(p, "\t ")] = 0;
+
+ if(!*port && !strcasecmp(line, "Port")) {
+ *port = xstrdup(q);
+ } else if(!*hostname && !strcasecmp(line, "Address")) {
+ *hostname = xstrdup(q);
+ if(*p) {
+ free(*port);
+ *port = xstrdup(p);
+ }
+ }
+
+ if(*hostname && *port)
+ break;
+ }
+
+ fclose(f);
+}
+static char *get_my_hostname(meshlink_handle_t* mesh) {
+ char *hostname = NULL;
+ char *port = NULL;
+ char *hostport = NULL;
+ char *name = mesh->self->name;
+ char filename[PATH_MAX] = "";
+ char line[4096];
+ FILE *f;
+
+ // Use first Address statement in own host config file
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ scan_for_hostname(filename, &hostname, &port);
+
+ if(hostname)
+ goto done;
+
+ // If that doesn't work, guess externally visible hostname
+ fprintf(stderr, "Trying to discover externally visible hostname...\n");
+ struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
+ struct addrinfo *aip = ai;
+ static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
+
+ while(aip) {
+ int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
+ if(s >= 0) {
+ if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
+ closesocket(s);
+ s = -1;
+ }
+ }
+ if(s >= 0) {
+ send(s, request, sizeof request - 1, 0);
+ int len = recv(s, line, sizeof line - 1, MSG_WAITALL);
+ if(len > 0) {
+ line[len] = 0;
+ if(line[len - 1] == '\n')
+ line[--len] = 0;
+ char *p = strrchr(line, '\n');
+ if(p && p[1])
+ hostname = xstrdup(p + 1);
+ }
+ closesocket(s);
+ if(hostname)
+ break;
+ }
+ aip = aip->ai_next;
+ continue;
+ }
+
+ if(ai)
+ freeaddrinfo(ai);
+
+ // Check that the hostname is reasonable
+ if(hostname) {
+ for(char *p = hostname; *p; p++) {
+ if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
+ continue;
+ // If not, forget it.
+ free(hostname);
+ hostname = NULL;
+ break;
+ }
+ }
+
+ if(!hostname)
return NULL;
+
+ f = fopen(filename, "a");
+ if(f) {
+ fprintf(f, "\nAddress = %s\n", hostname);
+ fclose(f);
+ } else {
+ fprintf(stderr, "Could not append Address to %s: %s\n", filename, strerror(errno));
}
- if(!name || !*name) {
- fprintf(stderr, "No name given!\n");
+done:
+ if(port) {
+ if(strchr(hostname, ':'))
+ xasprintf(&hostport, "[%s]:%s", hostname, port);
+ else
+ xasprintf(&hostport, "%s:%s", hostname, port);
+ } else {
+ if(strchr(hostname, ':'))
+ xasprintf(&hostport, "[%s]", hostname);
+ else
+ hostport = xstrdup(hostname);
+ }
+
+ free(hostname);
+ free(port);
+ return hostport;
+}
+
+static char *get_line(const char **data) {
+ if(!data || !*data)
+ return NULL;
+
+ if(!**data) {
+ *data = NULL;
return NULL;
}
- if(!check_id(name)) {
- fprintf(stderr, "Invalid name given!\n");
+ static char line[1024];
+ const char *end = strchr(*data, '\n');
+ size_t len = end ? end - *data : strlen(*data);
+ if(len >= sizeof line) {
+ fprintf(stderr, "Maximum line length exceeded!\n");
return NULL;
}
+ if(len && !isprint(**data))
+ abort();
- meshlink_handle_t *mesh = xzalloc(sizeof *mesh);
- mesh->confbase = xstrdup(confbase);
- mesh->name = xstrdup(name);
+ memcpy(line, *data, len);
+ line[len] = 0;
+
+ if(end)
+ *data = end + 1;
+ else
+ *data = NULL;
+
+ return line;
+}
+
+static char *get_value(const char *data, const char *var) {
+ char *line = get_line(&data);
+ if(!line)
+ return NULL;
+
+ char *sep = line + strcspn(line, " \t=");
+ char *val = sep + strspn(sep, " \t");
+ if(*val == '=')
+ val += 1 + strspn(val + 1, " \t");
+ *sep = 0;
+ if(strcasecmp(line, var))
+ return NULL;
+ return val;
+}
+
+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) {
+ freeaddrinfo(ai);
+ return false;
+ }
+ int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
+ closesocket(fd);
+ if(result) {
+ freeaddrinfo(ai);
+ return false;
+ }
+ ai = ai->ai_next;
+ }
+
+ freeaddrinfo(ai);
+ 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 finalize_join(meshlink_handle_t *mesh) {
+ char *name = xstrdup(get_value(mesh->data, "Name"));
+ if(!name) {
+ fprintf(stderr, "No Name found in invitation!\n");
+ return false;
+ }
+
+ if(!check_id(name)) {
+ fprintf(stderr, "Invalid Name found in invitation: %s!\n", name);
+ return false;
+ }
char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", confbase);
+ snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
- FILE *f = fopen(filename, "r");
+ FILE *f = fopen(filename, "w");
+ if(!f) {
+ fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ fprintf(f, "Name = %s\n", name);
+
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ FILE *fh = fopen(filename, "w");
+ if(!fh) {
+ fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
+ fclose(f);
+ return false;
+ }
+
+ // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name
+ // Other chunks go unfiltered to their respective host config files
+ const char *p = mesh->data;
+ char *l, *value;
+
+ while((l = get_line(&p))) {
+ // Ignore comments
+ if(*l == '#')
+ continue;
+
+ // Split line into variable and value
+ int len = strcspn(l, "\t =");
+ value = l + len;
+ value += strspn(value, "\t ");
+ if(*value == '=') {
+ value++;
+ value += strspn(value, "\t ");
+ }
+ l[len] = 0;
+
+ // Is it a Name?
+ if(!strcasecmp(l, "Name"))
+ if(strcmp(value, name))
+ break;
+ else
+ continue;
+ else if(!strcasecmp(l, "NetName"))
+ continue;
+
+ // Check the list of known variables //TODO: most variables will not be available in meshlink, only name and key will be absolutely necessary
+ bool found = false;
+ int i;
+ for(i = 0; variables[i].name; i++) {
+ if(strcasecmp(l, variables[i].name))
+ continue;
+ found = true;
+ break;
+ }
+
+ // Ignore unknown and unsafe variables
+ if(!found) {
+ fprintf(stderr, "Ignoring unknown variable '%s' in invitation.\n", l);
+ continue;
+ } else if(!(variables[i].type & VAR_SAFE)) {
+ fprintf(stderr, "Ignoring unsafe variable '%s' in invitation.\n", l);
+ continue;
+ }
+
+ // Copy the safe variable to the right config file
+ fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
+ }
+
+ fclose(f);
+
+ while(l && !strcasecmp(l, "Name")) {
+ if(!check_id(value)) {
+ fprintf(stderr, "Invalid Name found in invitation.\n");
+ return false;
+ }
+
+ if(!strcmp(value, name)) {
+ fprintf(stderr, "Secondary chunk would overwrite our own host config file.\n");
+ return false;
+ }
+
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
+ f = fopen(filename, "w");
+
+ if(!f) {
+ fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ while((l = get_line(&p))) {
+ if(!strcmp(l, "#---------------------------------------------------------------#"))
+ continue;
+ int len = strcspn(l, "\t =");
+ if(len == 4 && !strncasecmp(l, "Name", 4)) {
+ value = l + len;
+ value += strspn(value, "\t ");
+ if(*value == '=') {
+ value++;
+ value += strspn(value, "\t ");
+ }
+ l[len] = 0;
+ break;
+ }
+
+ fputs(l, f);
+ fputc('\n', f);
+ }
+
+ fclose(f);
+ }
+
+ char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
+ if(!b64key)
+ return false;
+
+ fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
+ fprintf(fh, "Port = %s\n", mesh->myport);
+
+ fclose(fh);
+
+ sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
+ free(b64key);
+
+ free(mesh->self->name);
+ free(mesh->self->connection->name);
+ mesh->self->name = xstrdup(name);
+ mesh->self->connection->name = name;
+
+ fprintf(stderr, "Configuration stored in: %s\n", mesh->confbase);
+
+ load_all_nodes(mesh);
+
+ return true;
+}
+
+static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
+ meshlink_handle_t* mesh = handle;
+ while(len) {
+ int result = send(mesh->sock, data, len, 0);
+ if(result == -1 && errno == EINTR)
+ continue;
+ else if(result <= 0)
+ return false;
+ data += result;
+ len -= result;
+ }
+ return true;
+}
+
+static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
+ meshlink_handle_t* mesh = handle;
+ switch(type) {
+ case SPTPS_HANDSHAKE:
+ return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof mesh->cookie);
+
+ case 0:
+ mesh->data = xrealloc(mesh->data, mesh->thedatalen + len + 1);
+ memcpy(mesh->data + mesh->thedatalen, msg, len);
+ mesh->thedatalen += len;
+ mesh->data[mesh->thedatalen] = 0;
+ break;
+
+ case 1:
+ return finalize_join(mesh);
+
+ case 2:
+ fprintf(stderr, "Invitation succesfully accepted.\n");
+ shutdown(mesh->sock, SHUT_RDWR);
+ mesh->success = true;
+ break;
+
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static bool recvline(meshlink_handle_t* mesh, size_t len) {
+ char *newline = NULL;
+
+ if(!mesh->sock)
+ abort();
+
+ while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
+ int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof mesh->buffer - mesh->blen, 0);
+ if(result == -1 && errno == EINTR)
+ continue;
+ else if(result <= 0)
+ return false;
+ mesh->blen += result;
+ }
+
+ if(newline - mesh->buffer >= len)
+ return false;
+
+ len = newline - mesh->buffer;
+
+ memcpy(mesh->line, mesh->buffer, len);
+ mesh->line[len] = 0;
+ memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
+ mesh->blen -= len + 1;
+
+ return true;
+}
+static bool sendline(int fd, char *format, ...) {
+ static char buffer[4096];
+ char *p = buffer;
+ int blen = 0;
+ va_list ap;
+
+ va_start(ap, format);
+ blen = vsnprintf(buffer, sizeof buffer, format, ap);
+ va_end(ap);
+
+ if(blen < 1 || blen >= sizeof buffer)
+ return false;
+
+ buffer[blen] = '\n';
+ blen++;
+
+ while(blen) {
+ int result = send(fd, p, blen, MSG_NOSIGNAL);
+ if(result == -1 && errno == EINTR)
+ continue;
+ else if(result <= 0)
+ return false;
+ p += result;
+ blen -= result;
+ }
- if(!f && errno == ENOENT)
- return meshlink_setup(mesh);
+ return true;
+}
+
+static const char *errstr[] = {
+ [MESHLINK_OK] = "No error",
+ [MESHLINK_EINVAL] = "Invalid argument",
+ [MESHLINK_ENOMEM] = "Out of memory",
+ [MESHLINK_ENOENT] = "No such node",
+ [MESHLINK_EEXIST] = "Node already exists",
+ [MESHLINK_EINTERNAL] = "Internal error",
+ [MESHLINK_ERESOLV] = "Could not resolve hostname",
+ [MESHLINK_ESTORAGE] = "Storage error",
+ [MESHLINK_ENETWORK] = "Network error",
+ [MESHLINK_EPEER] = "Error communicating with peer",
+};
+
+const char *meshlink_strerror(meshlink_errno_t err) {
+ if(err < 0 || err >= sizeof errstr / sizeof *errstr)
+ return "Invalid error code";
+ return errstr[err];
+}
+
+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");
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ } else
+ fprintf(stderr, "Done.\n");
+
+ snprintf(privname, sizeof privname, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
+ f = fopen(privname, "w");
if(!f) {
- fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
- return meshlink_close(mesh), NULL;
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
}
- char buf[1024] = "";
- if(!fgets(buf, sizeof buf, f)) {
- fprintf(stderr, "Could not read line from %s: %s\n", filename, strerror(errno));
+#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 meshlink_close(mesh), NULL;
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
}
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;
+ snprintf(pubname, sizeof pubname, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
+ f = fopen(pubname, "a");
- if(strncmp(buf, "Name = ", 7) || !check_id(buf + 7)) {
- fprintf(stderr, "Could not read Name from %s\n", filename);
- return meshlink_close(mesh), NULL;
+ if(!f) {
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
}
- 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);
+ 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 meshlink_setup(meshlink_handle_t *mesh) {
+ if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
}
- snprintf(filename, sizeof filename, "%s" SLASH "ed25519_key.priv", mesh->confbase);
- f = fopen(filename, "r");
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts", mesh->confbase);
+
+ if(mkdir(filename, 0777) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
+
+ if(!access(filename, F_OK)) {
+ fprintf(stderr, "Configuration file %s already exists!\n", filename);
+ meshlink_errno = MESHLINK_EEXIST;
+ return false;
+ }
+
+ FILE *f = fopen(filename, "w");
if(!f) {
- fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
- return meshlink_close(mesh), NULL;
+ fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
}
- mesh->self->ecdsa = ecdsa_read_pem_private_key(f);
+ fprintf(f, "Name = %s\n", mesh->name);
fclose(f);
- if(!mesh->self->ecdsa) {
- fprintf(stderr, "Could not read keypair!\n");
- return meshlink_close(mesh), NULL;
+ if(!ecdsa_keygen(mesh)) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ check_port(mesh);
+
+ return true;
+}
+
+
+meshlink_handle_t *meshlink_open(const char *confbase, const char *name) {
+ return meshlink_open_with_size(confbase, name, sizeof(meshlink_handle_t) );
+}
+
+
+meshlink_handle_t *meshlink_open_with_size(const char *confbase, const char *name, size_t size) {
+ // Validate arguments provided by the application
+ bool usingname = false;
+
+ if(!confbase || !*confbase) {
+ fprintf(stderr, "No confbase given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ if(!name || !*name) {
+ fprintf(stderr, "No name given!\n");
+ //return NULL;
+ }
+ else { //check name only if there is a name != NULL
+
+ if(!check_id(name)) {
+ fprintf(stderr, "Invalid name given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ } else { usingname = true;}
+ }
+
+ meshlink_handle_t *mesh = xzalloc(size);
+ mesh->confbase = xstrdup(confbase);
+ if (usingname) mesh->name = xstrdup(name);
+ pthread_mutex_init ( &(mesh->outpacketqueue_mutex), NULL);
+ pthread_mutex_init ( &(mesh->nodes_mutex), NULL);
+ mesh->threadstarted = false;
+ event_loop_init(&mesh->loop);
+ mesh->loop.data = 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);
+
+ if(access(filename, R_OK)) {
+ if(errno == ENOENT) {
+ // If not, create it
+ if(!meshlink_setup(mesh)) {
+ // meshlink_errno is set by meshlink_setup()
+ return NULL;
+ }
+ } else {
+ fprintf(stderr, "Cannot not read from %s: %s\n", filename, strerror(errno));
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ }
+ }
+
+ // Read the configuration
+
+ init_configuration(&mesh->config);
+
+ if(!read_server_config(mesh)) {
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ };
+
+#ifdef HAVE_MINGW
+ struct WSAData wsa_state;
+ WSAStartup(MAKEWORD(2, 2), &wsa_state);
+#endif
+
+ // Setup up everything
+ // TODO: we should not open listening sockets yet
+
+ if(!setup_network(mesh)) {
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_ENETWORK;
+ return NULL;
}
return mesh;
}
+static void *meshlink_main_loop(void *arg) {
+ meshlink_handle_t *mesh = arg;
+
+ try_outgoing_connections(mesh);
+
+ main_loop(mesh);
+
+ return NULL;
+}
+
bool meshlink_start(meshlink_handle_t *mesh) {
- return false;
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ // TODO: open listening sockets first
+
+ //Check that a valid name is set
+ if(!mesh->name ) {
+ fprintf(stderr, "No name given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ // 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);
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ mesh->threadstarted=true;
+
+ return true;
}
void meshlink_stop(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ // Shut down the listening sockets to signal the main thread to shut down
+
+ for(int i = 0; i < mesh->listen_sockets; i++) {
+ shutdown(mesh->listen_socket[i].tcp.fd, SHUT_RDWR);
+ shutdown(mesh->listen_socket[i].udp.fd, SHUT_RDWR);
+ }
+
+ // Wait for the main thread to finish
+
+ pthread_join(mesh->thread, NULL);
}
void meshlink_close(meshlink_handle_t *mesh) {
+ if(!mesh || !mesh->confbase) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ // Close and free all resources used.
+
+ close_network_connections(mesh);
+
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
+
+ exit_configuration(&mesh->config);
+ event_loop_exit(&mesh->loop);
+
+#ifdef HAVE_MINGW
+ if(mesh->confbase)
+ WSACleanup();
+#endif
+
+ ecdsa_free(mesh->invitation_key);
+
+ free(mesh->name);
+ free(mesh->confbase);
+
+ memset(mesh, 0, sizeof *mesh);
+
+ free(mesh);
}
void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
mesh->receive_cb = cb;
}
void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
mesh->node_status_cb = cb;
}
void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
mesh->log_cb = cb;
mesh->log_level = level;
}
-bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, unsigned int len) {
- return false;
+bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
+ if(!mesh || !destination) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(!len)
+ return true;
+
+ if(!data) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ /* If there is no outgoing list yet, create one. */
+
+ if(!mesh->outpacketqueue)
+ mesh->outpacketqueue = list_alloc(NULL);
+
+ //add packet to the queue
+ outpacketqueue_t *packet_in_queue = xzalloc(sizeof *packet_in_queue);
+ packet_in_queue->destination=destination;
+ packet_in_queue->data=data;
+ packet_in_queue->len=len;
+ pthread_mutex_lock(&(mesh->outpacketqueue_mutex));
+ list_insert_head(mesh->outpacketqueue,packet_in_queue);
+ pthread_mutex_unlock(&(mesh->outpacketqueue_mutex));
+
+ //notify event loop
+ signal_trigger(&(mesh->loop),&(mesh->datafromapp));
+ return true;
+}
+
+void meshlink_send_from_queue(event_loop_t* el,meshlink_handle_t *mesh) {
+ vpn_packet_t packet;
+ meshlink_packethdr_t *hdr = (meshlink_packethdr_t *)packet.data;
+
+ outpacketqueue_t* p = list_get_tail(mesh->outpacketqueue);
+ if (p)
+ list_delete_tail(mesh->outpacketqueue);
+ else return ;
+
+ if (sizeof(meshlink_packethdr_t) + p->len > MAXSIZE) {
+ //log something
+ return ;
+ }
+
+ packet.probe = false;
+ memset(hdr, 0, sizeof *hdr);
+ memcpy(hdr->destination, p->destination->name, sizeof hdr->destination);
+ memcpy(hdr->source, mesh->self->name, sizeof hdr->source);
+
+ packet.len = sizeof *hdr + p->len;
+ memcpy(packet.data + sizeof *hdr, p->data, p->len);
+
+ mesh->self->in_packets++;
+ mesh->self->in_bytes += packet.len;
+ route(mesh, mesh->self, &packet);
+ return ;
+}
+
+ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
+ if(!mesh || !destination) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
+
+ node_t *n = (node_t *)destination;
+ if(!n->status.reachable)
+ return 0;
+ else if(n->mtuprobes > 30 && n->minmtu)
+ return n->minmtu;
+ else
+ return MTU;
+}
+
+char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
+ if(!mesh || !node) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ node_t *n = (node_t *)node;
+
+ if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
+
+ if(!fingerprint)
+ meshlink_errno = MESHLINK_EINTERNAL;
+
+ return fingerprint;
}
meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
- return NULL;
+ if(!mesh || !name) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ return (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
}
-size_t meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t nmemb) {
- return 0;
+meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
+ if(!mesh || !nmemb || (*nmemb && !nodes)) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ meshlink_node_t **result;
+
+ //lock mesh->nodes
+ pthread_mutex_lock(&(mesh->nodes_mutex));
+
+ *nmemb = mesh->nodes->count;
+ result = realloc(nodes, *nmemb * sizeof *nodes);
+
+ if(result) {
+ meshlink_node_t **p = result;
+ for splay_each(node_t, n, mesh->nodes)
+ *p++ = (meshlink_node_t *)n;
+ } else {
+ *nmemb = 0;
+ free(nodes);
+ meshlink_errno = MESHLINK_ENOMEM;
+ }
+
+ pthread_mutex_unlock(&(mesh->nodes_mutex));
+
+ return result;
}
-char *meshlink_sign(meshlink_handle_t *mesh, const char *data, size_t len) {
- return NULL;
+bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
+ if(!mesh || !data || !len || !signature || !siglen) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(*siglen < MESHLINK_SIGLEN) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ *siglen = MESHLINK_SIGLEN;
+ return true;
}
-bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const char *data, size_t len, const char *signature) {
- return false;
+bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
+ if(!mesh || !data || !len || !signature) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(siglen != MESHLINK_SIGLEN) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ struct node_t *n = (struct node_t *)source;
+ node_read_ecdsa_public_key(mesh, n);
+ if(!n->ecdsa) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ return ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
+}
+
+static bool refresh_invitation_key(meshlink_handle_t *mesh) {
+ char filename[PATH_MAX];
+
+ snprintf(filename, sizeof filename, "%s" SLASH "invitations", mesh->confbase);
+ if(mkdir(filename, 0700) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ // Count the number of valid invitations, clean up old ones
+ DIR *dir = opendir(filename);
+ if(!dir) {
+ fprintf(stderr, "Could not read directory %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ errno = 0;
+ int count = 0;
+ struct dirent *ent;
+ time_t deadline = time(NULL) - 604800; // 1 week in the past
+
+ while((ent = readdir(dir))) {
+ if(strlen(ent->d_name) != 24)
+ continue;
+ char invname[PATH_MAX];
+ struct stat st;
+ snprintf(invname, sizeof invname, "%s" SLASH "%s", filename, ent->d_name);
+ if(!stat(invname, &st)) {
+ if(mesh->invitation_key && deadline < st.st_mtime)
+ count++;
+ else
+ unlink(invname);
+ } else {
+ fprintf(stderr, "Could not stat %s: %s\n", invname, strerror(errno));
+ errno = 0;
+ }
+ }
+
+ if(errno) {
+ fprintf(stderr, "Error while reading directory %s: %s\n", filename, strerror(errno));
+ closedir(dir);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ closedir(dir);
+
+ snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
+
+ // Remove the key if there are no outstanding invitations.
+ if(!count) {
+ unlink(filename);
+ if(mesh->invitation_key) {
+ ecdsa_free(mesh->invitation_key);
+ mesh->invitation_key = NULL;
+ }
+ }
+
+ if(mesh->invitation_key)
+ return true;
+
+ // Create a new key if necessary.
+ FILE *f = fopen(filename, "r");
+ if(!f) {
+ if(errno != ENOENT) {
+ fprintf(stderr, "Could not read %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ mesh->invitation_key = ecdsa_generate();
+ if(!mesh->invitation_key) {
+ fprintf(stderr, "Could not generate a new key!\n");
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+ f = fopen(filename, "w");
+ if(!f) {
+ fprintf(stderr, "Could not write %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+ chmod(filename, 0600);
+ ecdsa_write_pem_private_key(mesh->invitation_key, f);
+ fclose(f);
+ } else {
+ mesh->invitation_key = ecdsa_read_pem_private_key(f);
+ fclose(f);
+ if(!mesh->invitation_key) {
+ fprintf(stderr, "Could not read private key from %s\n", filename);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ }
+ }
+
+ return mesh->invitation_key;
+}
+
+bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
+ if(!mesh || !address) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ for(const char *p = address; *p; p++) {
+ if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
+ continue;
+ fprintf(stderr, "Invalid character in address: %s\n", address);
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ return append_config_file(mesh, mesh->self->name, "Address", address);
}
char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
- return NULL;
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ // Check validity of the new node's name
+ if(!check_id(name)) {
+ fprintf(stderr, "Invalid name for node.\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ // Ensure no host configuration file with that name exists
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ if(!access(filename, F_OK)) {
+ fprintf(stderr, "A host config file for %s already exists!\n", name);
+ meshlink_errno = MESHLINK_EEXIST;
+ return NULL;
+ }
+
+ // Ensure no other nodes know about this name
+ if(meshlink_get_node(mesh, name)) {
+ fprintf(stderr, "A node with name %s is already known!\n", name);
+ meshlink_errno = MESHLINK_EEXIST;
+ return NULL;
+ }
+
+ // Get the local address
+ char *address = get_my_hostname(mesh);
+ if(!address) {
+ fprintf(stderr, "No Address known for ourselves!\n");
+ meshlink_errno = MESHLINK_ERESOLV;
+ return NULL;
+ }
+
+ if(!refresh_invitation_key(mesh)) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return NULL;
+ }
+
+ char hash[64];
+
+ // Create a hash of the key.
+ char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
+ sha512(fingerprint, strlen(fingerprint), hash);
+ b64encode_urlsafe(hash, hash, 18);
+
+ // Create a random cookie for this invitation.
+ char cookie[25];
+ randomize(cookie, 18);
+
+ // Create a filename that doesn't reveal the cookie itself
+ char buf[18 + strlen(fingerprint)];
+ char cookiehash[64];
+ memcpy(buf, cookie, 18);
+ memcpy(buf + 18, fingerprint, sizeof buf - 18);
+ sha512(buf, sizeof buf, cookiehash);
+ b64encode_urlsafe(cookiehash, cookiehash, 18);
+
+ b64encode_urlsafe(cookie, cookie, 18);
+
+ free(fingerprint);
+
+ // Create a file containing the details of the invitation.
+ snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
+ int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
+ if(!ifd) {
+ fprintf(stderr, "Could not create invitation file %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ }
+ FILE *f = fdopen(ifd, "w");
+ if(!f)
+ abort();
+
+ // Fill in the details.
+ fprintf(f, "Name = %s\n", name);
+ //if(netname)
+ // fprintf(f, "NetName = %s\n", netname);
+ fprintf(f, "ConnectTo = %s\n", mesh->self->name);
+
+ // Copy Broadcast and Mode
+ snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
+ FILE *tc = fopen(filename, "r");
+ if(tc) {
+ char buf[1024];
+ while(fgets(buf, sizeof buf, tc)) {
+ if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
+ || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
+ fputs(buf, f);
+ // Make sure there is a newline character.
+ if(!strchr(buf, '\n'))
+ fputc('\n', f);
+ }
+ }
+ fclose(tc);
+ } else {
+ fprintf(stderr, "Could not create %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ }
+
+ fprintf(f, "#---------------------------------------------------------------#\n");
+ fprintf(f, "Name = %s\n", mesh->self->name);
+
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
+ fcopy(f, filename);
+ fclose(f);
+
+ // Create an URL from the local address, key hash and cookie
+ char *url;
+ xasprintf(&url, "%s/%s%s", address, hash, cookie);
+ free(address);
+
+ return url;
}
bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
+ if(!mesh || !invitation) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
+ char copy[strlen(invitation) + 1];
+ strcpy(copy, invitation);
+
+ // Split the invitation URL into hostname, port, key hash and cookie.
+
+ char *slash = strchr(copy, '/');
+ if(!slash)
+ goto invalid;
+
+ *slash++ = 0;
+
+ if(strlen(slash) != 48)
+ goto invalid;
+
+ char *address = copy;
+ char *port = NULL;
+ if(*address == '[') {
+ address++;
+ char *bracket = strchr(address, ']');
+ if(!bracket)
+ goto invalid;
+ *bracket = 0;
+ if(bracket[1] == ':')
+ port = bracket + 2;
+ } else {
+ port = strchr(address, ':');
+ if(port)
+ *port++ = 0;
+ }
+
+ if(!port)
+ port = "655";
+
+ if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18))
+ goto invalid;
+
+ // Generate a throw-away key for the invitation.
+ ecdsa_t *key = ecdsa_generate();
+ if(!key) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ char *b64key = ecdsa_get_base64_public_key(key);
+
+ //Before doing meshlink_join make sure we are not connected to another mesh
+ if ( mesh->threadstarted ){
+ goto invalid;
+ }
+
+ // Connect to the meshlink daemon mentioned in the URL.
+ struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
+ if(!ai) {
+ meshlink_errno = MESHLINK_ERESOLV;
+ return false;
+ }
+
+ mesh->sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if(mesh->sock <= 0) {
+ fprintf(stderr, "Could not open socket: %s\n", strerror(errno));
+ freeaddrinfo(ai);
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
+ }
+
+ if(connect(mesh->sock, ai->ai_addr, ai->ai_addrlen)) {
+ fprintf(stderr, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
+ closesocket(mesh->sock);
+ freeaddrinfo(ai);
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
+ }
+
+ freeaddrinfo(ai);
+
+ fprintf(stderr, "Connected to %s port %s...\n", address, port);
+
+ // Tell him we have an invitation, and give him our throw-away key.
+
+ mesh->blen = 0;
+
+ if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
+ fprintf(stderr, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
+ closesocket(mesh->sock);
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
+ }
+
+ free(b64key);
+
+ char hisname[4096] = "";
+ int code, hismajor, hisminor = 0;
+
+ if(!recvline(mesh, sizeof mesh->line) || sscanf(mesh->line, "%d %s %d.%d", &code, hisname, &hismajor, &hisminor) < 3 || code != 0 || hismajor != PROT_MAJOR || !check_id(hisname) || !recvline(mesh, sizeof mesh->line) || !rstrip(mesh->line) || sscanf(mesh->line, "%d ", &code) != 1 || code != ACK || strlen(mesh->line) < 3) {
+ fprintf(stderr, "Cannot read greeting from peer\n");
+ closesocket(mesh->sock);
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
+ }
+
+ // Check if the hash of the key he gave us matches the hash in the URL.
+ char *fingerprint = mesh->line + 2;
+ char hishash[64];
+ if(sha512(fingerprint, strlen(fingerprint), hishash)) {
+ fprintf(stderr, "Could not create hash\n%s\n", mesh->line + 2);
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+ if(memcmp(hishash, mesh->hash, 18)) {
+ fprintf(stderr, "Peer has an invalid key!\n%s\n", mesh->line + 2);
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+
+ }
+
+ ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
+ if(!hiskey) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ // Start an SPTPS session
+ if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, "meshlink invitation", 15, invitation_send, invitation_receive)) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ // Feed rest of input buffer to SPTPS
+ if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+ }
+
+ int len;
+
+ while((len = recv(mesh->sock, mesh->line, sizeof mesh->line, 0))) {
+ if(len < 0) {
+ if(errno == EINTR)
+ continue;
+ fprintf(stderr, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
+ }
+
+ if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+ }
+ }
+
+ sptps_stop(&mesh->sptps);
+ ecdsa_free(hiskey);
+ ecdsa_free(key);
+ closesocket(mesh->sock);
+
+ if(!mesh->success) {
+ fprintf(stderr, "Connection closed by peer, invitation cancelled.\n");
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+ }
+
+ return true;
+
+invalid:
+ fprintf(stderr, "Invalid invitation URL or you are already connected to a Mesh ?\n");
+ meshlink_errno = MESHLINK_EINVAL;
return false;
}
char *meshlink_export(meshlink_handle_t *mesh) {
- return NULL;
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
+ FILE *f = fopen(filename, "r");
+ if(!f) {
+ fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ }
+
+ fseek(f, 0, SEEK_END);
+ int fsize = ftell(f);
+ rewind(f);
+
+ size_t len = fsize + 9 + strlen(mesh->self->name);
+ char *buf = xmalloc(len);
+ snprintf(buf, len, "Name = %s\n", mesh->self->name);
+ if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) {
+ fprintf(stderr, "Error reading from %s: %s\n", filename, strerror(errno));
+ fclose(f);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ }
+
+ fclose(f);
+ buf[len - 1] = 0;
+ return buf;
}
bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
- return false;
+ if(!mesh || !data) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(strncmp(data, "Name = ", 7)) {
+ fprintf(stderr, "Invalid data\n");
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+ }
+
+ char *end = strchr(data + 7, '\n');
+ if(!end) {
+ fprintf(stderr, "Invalid data\n");
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+ }
+
+ int len = end - (data + 7);
+ char name[len + 1];
+ memcpy(name, data + 7, len);
+ name[len] = 0;
+ if(!check_id(name)) {
+ fprintf(stderr, "Invalid Name\n");
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ if(!access(filename, F_OK)) {
+ fprintf(stderr, "File %s already exists, not importing\n", filename);
+ meshlink_errno = MESHLINK_EEXIST;
+ return false;
+ }
+
+ if(errno != ENOENT) {
+ fprintf(stderr, "Error accessing %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ FILE *f = fopen(filename, "w");
+ if(!f) {
+ fprintf(stderr, "Could not create %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ fwrite(end + 1, strlen(end + 1), 1, f);
+ fclose(f);
+
+ load_all_nodes(mesh);
+
+ return true;
}
void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
+ if(!mesh || !node) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ node_t *n;
+ n = (node_t*)node;
+ n->status.blacklisted=true;
+ fprintf(stderr, "Blacklisted %s.\n",node->name);
+
+ //Make blacklisting persistent in the config file
+ append_config_file(mesh, n->name, "blacklisted", "yes");
+
+ return;
+}
+
+void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
+ if(!mesh || !node) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ node_t *n = (node_t *)node;
+ n->status.blacklisted = false;
+
+ //TODO: remove blacklisted = yes from the config file
+
+ return;
}
+static void __attribute__((constructor)) meshlink_init(void) {
+ crypto_init();
+}
+
+static void __attribute__((destructor)) meshlink_exit(void) {
+ crypto_exit();
+}
projects / meshlink / blobdiff