/*
meshlink.c -- Implementation of the MeshLink API.
- Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
+ Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "node.h"
#include "protocol.h"
#include "route.h"
+#include "sockaddr.h"
#include "utils.h"
#include "xalloc.h"
#include "ed25519/sha512.h"
#define MSG_NOSIGNAL 0
#endif
-static pthread_mutex_t global_mutex;
-
__thread meshlink_errno_t meshlink_errno;
meshlink_log_cb_t global_log_cb;
meshlink_log_level_t global_log_level;
//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 */
+ {"CanonicalAddress", VAR_HOST},
{"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}
};
static bool fcopy(FILE *out, const char *filename) {
FILE *in = fopen(filename, "r");
+
if(!in) {
logger(NULL, MESHLINK_ERROR, "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)))
+
+ while((len = fread(buf, 1, sizeof(buf), in))) {
fwrite(buf, len, 1, out);
+ }
+
fclose(in);
return true;
}
static int rstrip(char *value) {
int len = strlen(value);
- while(len && strchr("\t\r\n ", value[len - 1]))
+
+ while(len && strchr("\t\r\n ", value[len - 1])) {
value[--len] = 0;
+ }
+
return len;
}
static void scan_for_hostname(const char *filename, char **hostname, char **port) {
char line[4096];
- if(!filename || (*hostname && *port))
+ bool canonical = false;
+
+ if(!filename || (*hostname && *port)) {
return;
+ }
FILE *f = fopen(filename, "r");
- if(!f)
+
+ if(!f) {
return;
+ }
- while(fgets(line, sizeof line, f)) {
- if(!rstrip(line))
+ while(fgets(line, sizeof(line), f)) {
+ if(!rstrip(line)) {
continue;
+ }
+
char *p = line, *q;
p += strcspn(p, "\t =");
- if(!*p)
+
+ if(!*p) {
continue;
+ }
+
q = p + strspn(p, "\t ");
- if(*q == '=')
+
+ if(*q == '=') {
q += 1 + strspn(q + 1, "\t ");
+ }
+
+ // q is now pointing to the hostname
*p = 0;
p = q + strcspn(q, "\t ");
- if(*p)
+
+ if(*p) {
*p++ = 0;
+ }
+
p += strspn(p, "\t ");
p[strcspn(p, "\t ")] = 0;
+ // p is now pointing to the port, if present
if(!*port && !strcasecmp(line, "Port")) {
*port = xstrdup(q);
- } else if(!*hostname && !strcasecmp(line, "Address")) {
+ } else if(!canonical && !*hostname && !strcasecmp(line, "Address")) {
+ // Check that the hostname is a symbolic name (it's not a numeric IPv4 or IPv6 address)
+ if(!q[strspn(q, "0123456789.")] || strchr(q, ':')) {
+ continue;
+ }
+
+ *hostname = xstrdup(q);
+
+ if(*p) {
+ free(*port);
+ *port = xstrdup(p);
+ }
+ } else if(!strcasecmp(line, "CanonicalAddress")) {
*hostname = xstrdup(q);
+ canonical = true;
+
if(*p) {
free(*port);
*port = xstrdup(p);
}
}
- if(*hostname && *port)
+ if(canonical && *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);
+static bool is_valid_hostname(const char *hostname) {
+ if(!*hostname) {
+ return false;
+ }
- if(hostname)
- goto done;
+ for(const char *p = hostname; *p; p++) {
+ if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static bool is_valid_port(const char *port) {
+ if(!*port) {
+ return false;
+ }
+
+ if(isdigit(*port)) {
+ char *end;
+ unsigned long int result = strtoul(port, &end, 10);
+ return result && result < 65536 && !*end;
+ }
+
+ for(const char *p = port; *p; p++) {
+ if(!(isalnum(*p) || *p == '-')) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static void set_timeout(int sock, int timeout) {
+#ifdef _WIN32
+ DWORD tv = timeout;
+#else
+ struct timeval tv;
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
+#endif
+ setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
+ setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
+}
+
+// Find out what local address a socket would use if we connect to the given address.
+// We do this using connect() on a UDP socket, so the kernel has to resolve the address
+// of both endpoints, but this will actually not send any UDP packet.
+static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) {
+ struct addrinfo *rai = NULL;
+ const struct addrinfo hint = {
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_DGRAM,
+ .ai_protocol = IPPROTO_UDP,
+ };
+
+ if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
+ return false;
+ }
+
+ int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol);
+
+ if(sock == -1) {
+ freeaddrinfo(rai);
+ return false;
+ }
+
+ if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
+ freeaddrinfo(rai);
+ return false;
+ }
+
+ freeaddrinfo(rai);
+
+ struct sockaddr_storage sn;
+ socklen_t sl = sizeof(sn);
+
+ if(getsockname(sock, (struct sockaddr *)&sn, &sl)) {
+ return false;
+ }
+
+ if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
+ return false;
+ }
+
+ return true;
+}
+
+char *meshlink_get_external_address(meshlink_handle_t *mesh) {
+ return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
+}
+
+char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
+ char *hostname = NULL;
- // If that doesn't work, guess externally visible hostname
logger(mesh, MESHLINK_DEBUG, "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";
+ char line[256];
+
+ for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
+ if(family != AF_UNSPEC && aip->ai_family != family) {
+ continue;
+ }
- while(aip) {
int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
+
if(s >= 0) {
+ set_timeout(s, 5000);
+
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);
+ 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')
+
+ if(line[len - 1] == '\n') {
line[--len] = 0;
+ }
+
char *p = strrchr(line, '\n');
- if(p && p[1])
+
+ if(p && p[1]) {
hostname = xstrdup(p + 1);
+ }
}
+
closesocket(s);
- if(hostname)
+
+ if(hostname) {
break;
+ }
}
- aip = aip->ai_next;
- continue;
}
- if(ai)
+ 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 && !is_valid_hostname(hostname)) {
+ free(hostname);
+ hostname = NULL;
}
- if(!hostname)
- return NULL;
+ // If there is no hostname, determine the address used for an outgoing connection.
+ if(!hostname) {
+ char localaddr[NI_MAXHOST];
+ bool success = false;
- f = fopen(filename, "a");
- if(f) {
- fprintf(f, "\nAddress = %s\n", hostname);
- fclose(f);
- } else {
- logger(mesh, MESHLINK_DEBUG, "Could not append Address to %s: %s\n", filename, strerror(errno));
+ if(family == AF_INET) {
+ success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr));
+ } else if(family == AF_INET6) {
+ success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr));
+ }
+
+ if(success) {
+ hostname = xstrdup(localaddr);
+ }
}
-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);
+ if(!hostname) {
+ meshlink_errno = MESHLINK_ERESOLV;
+ }
+
+ return hostname;
+}
+
+// String comparison which handles NULL arguments
+static bool safe_streq(const char *a, const char *b) {
+ if (!a || !b)
+ return a == b;
+ else
+ return !strcmp(a, b);
+}
+
+// This gets the hostname part for use in invitation URLs
+static char *get_my_hostname(meshlink_handle_t *mesh) {
+ char *hostname[3] = {NULL};
+ char *port[3] = {NULL};
+ char *hostport = NULL;
+
+ // Use the best Address statement in our own host config file
+ char filename[PATH_MAX] = "";
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
+ scan_for_hostname(filename, &hostname[0], &port[0]);
+
+ hostname[1] = meshlink_get_external_address_for_family(mesh, AF_INET);
+ hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET6);
+
+ // Concatenate all unique address to the hostport string
+ for (int i = 0; i < 3; i++) {
+ if (!hostname[i])
+ continue;
+
+ // Ignore duplicate hostnames
+ bool found = false;
+
+ for (int j = 0; i < j; j++) {
+ if (safe_streq(hostname[i], hostname[j]) && safe_streq(port[i], port[j])) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found) {
+ free(hostname[i]);
+ free(port[i]);
+ hostname[i] = NULL;
+ port[i] = NULL;
+ continue;
+ }
+
+ // Ensure we have the same addresses in our own host config file.
+ char *tmphostport;
+ xasprintf(&tmphostport, "%s %s", hostname[i], port[i] ? port[i] : mesh->myport);
+ append_config_file(mesh, mesh->self->name, "Address", tmphostport);
+ free(tmphostport);
+
+ // Append the address to the hostport string
+ char *newhostport;
+ xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i] ? port[i] : mesh->myport);
+ free(hostname[i]);
+ free(port[i]);
+ free(hostport);
+ hostport = newhostport;
}
- free(hostname);
- free(port);
return hostport;
}
static char *get_line(const char **data) {
- if(!data || !*data)
+ if(!data || !*data) {
return NULL;
+ }
- if(!**data) {
+ if(! **data) {
*data = NULL;
return NULL;
}
static char line[1024];
const char *end = strchr(*data, '\n');
- size_t len = end ? end - *data : strlen(*data);
- if(len >= sizeof line) {
+ size_t len = end ? (size_t)(end - *data) : strlen(*data);
+
+ if(len >= sizeof(line)) {
logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
return NULL;
}
- if(len && !isprint(**data))
+
+ if(len && !isprint(**data)) {
abort();
+ }
memcpy(line, *data, len);
line[len] = 0;
- if(end)
+ if(end) {
*data = end + 1;
- else
+ } else {
*data = NULL;
+ }
return line;
}
static char *get_value(const char *data, const char *var) {
char *line = get_line(&data);
- if(!line)
+
+ if(!line) {
return NULL;
+ }
char *sep = line + strcspn(line, " \t=");
char *val = sep + strspn(sep, " \t");
- if(*val == '=')
+
+ if(*val == '=') {
val += 1 + strspn(val + 1, " \t");
+ }
+
*sep = 0;
- if(strcasecmp(line, var))
+
+ if(strcasecmp(line, var)) {
return NULL;
+ }
+
return val;
}
};
char portstr[16];
- snprintf(portstr, sizeof portstr, "%d", port);
+ snprintf(portstr, sizeof(portstr), "%d", port);
- if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
+ 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;
}
return true;
}
-static int check_port(meshlink_handle_t *mesh) {
+int check_port(meshlink_handle_t *mesh) {
for(int i = 0; i < 1000; 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);
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
FILE *f = fopen(filename, "a");
+
if(!f) {
- logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
+ meshlink_errno = MESHLINK_ESTORAGE;
+ logger(mesh, MESHLINK_DEBUG, "Could not store Port.\n");
return 0;
}
}
}
- logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
+ meshlink_errno = MESHLINK_ENETWORK;
+ logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
return 0;
}
+static void deltree(const char *dirname) {
+ DIR *d = opendir(dirname);
+
+ if(d) {
+ struct dirent *ent;
+
+ while((ent = readdir(d))) {
+ if(ent->d_name[0] == '.') {
+ continue;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name);
+
+ if(unlink(filename)) {
+ deltree(filename);
+ }
+ }
+
+ closedir(d);
+ }
+
+ rmdir(dirname);
+}
+
static bool finalize_join(meshlink_handle_t *mesh) {
char *name = xstrdup(get_value(mesh->data, "Name"));
+
if(!name) {
logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
return false;
}
char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
FILE *f = fopen(filename, "w");
+
if(!f) {
logger(mesh, MESHLINK_DEBUG, "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);
+ // Wipe all old host config files and invitations
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
+ deltree(filename);
+
+ if(mkdir(filename, 0777) && errno != EEXIST) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
+ deltree(filename);
+
+ // Create a new host config file for ourself
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
FILE *fh = fopen(filename, "w");
+
if(!fh) {
logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
fclose(f);
while((l = get_line(&p))) {
// Ignore comments
- if(*l == '#')
+ 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))
+ if(strcmp(value, name)) {
break;
- else
+ } else {
continue;
- else if(!strcasecmp(l, "NetName"))
+ } 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
+ // Check the list of known variables
bool found = false;
int i;
+
for(i = 0; variables[i].name; i++) {
- if(strcasecmp(l, variables[i].name))
+ if(strcasecmp(l, variables[i].name)) {
continue;
+ }
+
found = true;
break;
}
return false;
}
- snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
f = fopen(filename, "w");
if(!f) {
}
while((l = get_line(&p))) {
- if(!strcmp(l, "#---------------------------------------------------------------#"))
+ 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;
}
}
char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
- if(!b64key)
+
+ if(!b64key) {
+ fclose(fh);
return false;
+ }
fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
fprintf(fh, "Port = %s\n", mesh->myport);
sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
free(b64key);
+ free(mesh->name);
free(mesh->self->name);
free(mesh->self->connection->name);
+ mesh->name = xstrdup(name);
mesh->self->name = xstrdup(name);
mesh->self->connection->name = name;
}
static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
- meshlink_handle_t* mesh = handle;
+ (void)type;
+ meshlink_handle_t *mesh = handle;
+ const char *ptr = data;
+
while(len) {
- int result = send(mesh->sock, data, len, 0);
- if(result == -1 && errno == EINTR)
+ int result = send(mesh->sock, ptr, len, 0);
+
+ if(result == -1 && errno == EINTR) {
continue;
- else if(result <= 0)
+ } else if(result <= 0) {
return false;
- data += result;
+ }
+
+ ptr += 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);
+ meshlink_handle_t *mesh = handle;
- case 2:
- logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
- shutdown(mesh->sock, SHUT_RDWR);
- mesh->success = true;
- break;
-
- default:
- return false;
+ 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:
+ mesh->thedatalen = 0;
+ return finalize_join(mesh);
+
+ case 2:
+ logger(mesh, MESHLINK_DEBUG, "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) {
+static bool recvline(meshlink_handle_t *mesh, size_t len) {
char *newline = NULL;
- if(!mesh->sock)
+ 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)
+ 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)
+ } else if(result <= 0) {
return false;
+ }
+
mesh->blen += result;
}
- if(newline - mesh->buffer >= len)
+ if((size_t)(newline - mesh->buffer) >= len) {
return false;
+ }
len = newline - mesh->buffer;
va_list ap;
va_start(ap, format);
- blen = vsnprintf(buffer, sizeof buffer, format, ap);
+ blen = vsnprintf(buffer, sizeof(buffer), format, ap);
va_end(ap);
- if(blen < 1 || blen >= sizeof buffer)
+ if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
return false;
+ }
buffer[blen] = '\n';
blen++;
while(blen) {
int result = send(fd, p, blen, MSG_NOSIGNAL);
- if(result == -1 && errno == EINTR)
+
+ if(result == -1 && errno == EINTR) {
continue;
- else if(result <= 0)
+ } else if(result <= 0) {
return false;
+ }
+
p += result;
blen -= result;
}
[MESHLINK_ESTORAGE] = "Storage error",
[MESHLINK_ENETWORK] = "Network error",
[MESHLINK_EPEER] = "Error communicating with peer",
+ [MESHLINK_ENOTSUP] = "Operation not supported",
+ [MESHLINK_EBUSY] = "MeshLink instance already in use",
};
const char *meshlink_strerror(meshlink_errno_t err) {
- if(err < 0 || err >= sizeof errstr / sizeof *errstr)
+ if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
return "Invalid error code";
+ }
+
return errstr[err];
}
logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
meshlink_errno = MESHLINK_EINTERNAL;
return false;
- } else
+ } else {
logger(mesh, MESHLINK_DEBUG, "Done.\n");
+ }
+
+ if(snprintf(privname, sizeof(privname), "%s" SLASH "ecdsa_key.priv", mesh->confbase) >= PATH_MAX) {
+ logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "ecdsa_key.priv\n", mesh->confbase);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
- snprintf(privname, sizeof privname, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
- f = fopen(privname, "w");
+ f = fopen(privname, "wb");
if(!f) {
meshlink_errno = MESHLINK_ESTORAGE;
fclose(f);
- snprintf(pubname, sizeof pubname, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
+ snprintf(pubname, sizeof(pubname), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
f = fopen(pubname, "a");
if(!f) {
return true;
}
+static struct timeval idle(event_loop_t *loop, void *data) {
+ (void)loop;
+ meshlink_handle_t *mesh = data;
+ struct timeval t, tmin = {3600, 0};
+
+ for splay_each(node_t, n, mesh->nodes) {
+ if(!n->utcp) {
+ continue;
+ }
+
+ t = utcp_timeout(n->utcp);
+
+ if(timercmp(&t, &tmin, <)) {
+ tmin = t;
+ }
+ }
+
+ return tmin;
+}
+
+// Get our local address(es) by simulating connecting to an Internet host.
+static void add_local_addresses(meshlink_handle_t *mesh) {
+ char host[NI_MAXHOST];
+ char entry[MAX_STRING_SIZE];
+
+ // IPv4 example.org
+
+ if(getlocaladdrname("93.184.216.34", host, sizeof(host))) {
+ snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
+ append_config_file(mesh, mesh->name, "Address", entry);
+ }
+
+ // IPv6 example.org
+
+ if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof(host))) {
+ snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
+ append_config_file(mesh, mesh->name, "Address", entry);
+ }
+}
+
static bool meshlink_setup(meshlink_handle_t *mesh) {
if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
}
char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "hosts", mesh->confbase);
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
if(mkdir(filename, 0777) && errno != EEXIST) {
logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
return false;
}
- snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
if(!access(filename, F_OK)) {
logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
}
FILE *f = fopen(filename, "w");
+
if(!f) {
logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
if(!ecdsa_keygen(mesh)) {
meshlink_errno = MESHLINK_EINTERNAL;
+ unlink(filename);
return false;
}
- check_port(mesh);
+ if(check_port(mesh) == 0) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ unlink(filename);
+ return false;
+ }
return true;
}
-meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char* appname, dev_class_t devclass) {
- return meshlink_open_with_size(confbase, name, appname, devclass, sizeof(meshlink_handle_t));
-}
-
-meshlink_handle_t *meshlink_open_with_size(const char *confbase, const char *name, const char* appname, dev_class_t devclass, size_t size) {
-
+meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
// Validate arguments provided by the application
bool usingname = false;
+ logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
+
if(!confbase || !*confbase) {
logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
meshlink_errno = MESHLINK_EINVAL;
return NULL;
}
+ if(strchr(appname, ' ')) {
+ logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
if(!name || !*name) {
logger(NULL, MESHLINK_ERROR, "No name given!\n");
//return NULL;
- }
- else { //check name only if there is a name != NULL
+ } else { //check name only if there is a name != NULL
if(!check_id(name)) {
logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
meshlink_errno = MESHLINK_EINVAL;
return NULL;
- } else { usingname = true;}
+ } else {
+ usingname = true;
+ }
}
- if(devclass < 0 || devclass > _DEV_CLASS_MAX) {
+ if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
meshlink_errno = MESHLINK_EINVAL;
return NULL;
}
- meshlink_handle_t *mesh = xzalloc(size);
+ meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
mesh->confbase = xstrdup(confbase);
mesh->appname = xstrdup(appname);
mesh->devclass = devclass;
- if (usingname) mesh->name = xstrdup(name);
- pthread_mutex_init ( &(mesh->nodes_mutex), NULL);
+ mesh->discovery = true;
+ mesh->invitation_timeout = 604800; // 1 week
+
+ if(usingname) {
+ mesh->name = xstrdup(name);
+ }
+
+ // initialize mutex
+ pthread_mutexattr_t attr;
+ pthread_mutexattr_init(&attr);
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+ pthread_mutex_init(&(mesh->mesh_mutex), &attr);
+
mesh->threadstarted = false;
event_loop_init(&mesh->loop);
mesh->loop.data = mesh;
+ meshlink_queue_init(&mesh->outpacketqueue);
+
// Check whether meshlink.conf already exists
char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", confbase);
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
if(access(filename, R_OK)) {
if(errno == ENOENT) {
}
}
+ // Open the configuration file and lock it
+
+ mesh->conffile = fopen(filename, "r");
+
+ if(!mesh->conffile) {
+ logger(NULL, MESHLINK_ERROR, "Cannot not open %s: %s\n", filename, strerror(errno));
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ }
+
+#ifdef FD_CLOEXEC
+ fcntl(fileno(mesh->conffile), F_SETFD, FD_CLOEXEC);
+#endif
+
+#ifdef HAVE_MINGW
+ // TODO: use _locking()?
+#else
+ if(flock(fileno(mesh->conffile), LOCK_EX | LOCK_NB) != 0) {
+ logger(NULL, MESHLINK_ERROR, "Cannot lock %s: %s\n", filename, strerror(errno));
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_EBUSY;
+ return NULL;
+ }
+#endif
+
// Read the configuration
init_configuration(&mesh->config);
#ifdef HAVE_MINGW
struct WSAData wsa_state;
+
WSAStartup(MAKEWORD(2, 2), &wsa_state);
+
#endif
// Setup up everything
return NULL;
}
+ add_local_addresses(mesh);
+
+ idle_set(&mesh->loop, idle, mesh);
+
+ logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
return mesh;
}
static void *meshlink_main_loop(void *arg) {
meshlink_handle_t *mesh = arg;
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
try_outgoing_connections(mesh);
logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
main_loop(mesh);
logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
bool meshlink_start(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
- if(!mesh) {
- meshlink_errno = MESHLINK_EINVAL;
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ if(mesh->threadstarted) {
+ logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return true;
+ }
+
+ if(mesh->listen_socket[0].tcp.fd < 0) {
+ logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
+ meshlink_errno = MESHLINK_ENETWORK;
return false;
}
+ mesh->thedatalen = 0;
+
// TODO: open listening sockets first
//Check that a valid name is set
- if(!mesh->name ) {
+ if(!mesh->name) {
logger(mesh, MESHLINK_DEBUG, "No name given!\n");
meshlink_errno = MESHLINK_EINVAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
// Start the main thread
+ event_loop_start(&mesh->loop);
+
if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
- memset(&mesh->thread, 0, sizeof mesh->thread);
+ memset(&mesh->thread, 0, sizeof(mesh)->thread);
meshlink_errno = MESHLINK_EINTERNAL;
+ event_loop_stop(&mesh->loop);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
- mesh->threadstarted=true;
+ mesh->threadstarted = true;
- discovery_start(mesh);
+#if HAVE_CATTA
+ if(mesh->discovery) {
+ discovery_start(mesh);
+ }
+
+#endif
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return true;
}
void meshlink_stop(meshlink_handle_t *mesh) {
-
- logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
-
if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
return;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
+
+#if HAVE_CATTA
+
// Stop discovery
- discovery_stop(mesh);
+ if(mesh->discovery) {
+ discovery_stop(mesh);
+ }
- // Shut down a listening socket to signal the main thread to shut down
+#endif
- listen_socket_t *s = &mesh->listen_socket[0];
- shutdown(s->tcp.fd, SHUT_RDWR);
+ // Shut down the main thread
+ event_loop_stop(&mesh->loop);
- // Wait for the main thread to finish
+ // Send ourselves a UDP packet to kick the event loop
+ for(int i = 0; i < mesh->listen_sockets; i++) {
+ sockaddr_t sa;
+ socklen_t salen = sizeof(sa.sa);
- pthread_join(mesh->thread, NULL);
- mesh->threadstarted = false;
+ if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
+ logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
+ continue;
+ }
- // Fix the socket
-
- closesocket(s->tcp.fd);
- io_del(&mesh->loop, &s->tcp);
- s->tcp.fd = setup_listen_socket(&s->sa);
- if(s->tcp.fd < 0)
- logger(mesh, MESHLINK_ERROR, "Could not repair listenen socket!");
- else
- io_add(&mesh->loop, &s->tcp, handle_new_meta_connection, s, s->tcp.fd, IO_READ);
+ if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
+ logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
+ }
+ }
+
+ if(mesh->threadstarted) {
+ // Wait for the main thread to finish
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ pthread_join(mesh->thread, NULL);
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ mesh->threadstarted = false;
+ }
+
+ // Close all metaconnections
+ if(mesh->connections) {
+ for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
+ next = node->next;
+ connection_t *c = node->data;
+ c->outgoing = NULL;
+ terminate_connection(mesh, c, false);
+ }
+ }
+
+ if(mesh->outgoings) {
+ list_delete_list(mesh->outgoings);
+ mesh->outgoings = NULL;
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
}
void meshlink_close(meshlink_handle_t *mesh) {
return;
}
+ // stop can be called even if mesh has not been started
+ meshlink_stop(mesh);
+
+ // lock is not released after this
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
// Close and free all resources used.
close_network_connections(mesh);
event_loop_exit(&mesh->loop);
#ifdef HAVE_MINGW
- if(mesh->confbase)
+
+ if(mesh->confbase) {
WSACleanup();
+ }
+
#endif
ecdsa_free(mesh->invitation_key);
free(mesh->name);
free(mesh->appname);
free(mesh->confbase);
+ pthread_mutex_destroy(&(mesh->mesh_mutex));
+
+ if(mesh->conffile) {
+ fclose(mesh->conffile);
+ }
- memset(mesh, 0, sizeof *mesh);
+ memset(mesh, 0, sizeof(*mesh));
free(mesh);
}
+bool meshlink_destroy(const char *confbase) {
+ if(!confbase) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
+
+ if(unlink(filename)) {
+ if(errno == ENOENT) {
+ meshlink_errno = MESHLINK_ENOENT;
+ return false;
+ } else {
+ logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+ }
+
+ deltree(confbase);
+
+ return true;
+}
+
void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
return;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
mesh->receive_cb = cb;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
}
void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
return;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
mesh->node_status_cb = cb;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+}
+
+void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ mesh->node_duplicate_cb = cb;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
}
void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
if(mesh) {
+ pthread_mutex_lock(&(mesh->mesh_mutex));
mesh->log_cb = cb;
mesh->log_level = cb ? level : 0;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
} else {
global_log_cb = cb;
global_log_level = cb ? level : 0;
}
bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
- if(!mesh || !destination) {
+ meshlink_packethdr_t *hdr;
+
+ // Validate arguments
+ if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
meshlink_errno = MESHLINK_EINVAL;
return false;
}
- if(!len)
+ if(!len) {
return true;
+ }
if(!data) {
meshlink_errno = MESHLINK_EINVAL;
return false;
}
- //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;
- if(!meshlink_queue_push(&mesh->outpacketqueue, packet_in_queue)) {
- free(packet_in_queue);
+ // Prepare the packet
+ vpn_packet_t *packet = malloc(sizeof(*packet));
+
+ if(!packet) {
+ meshlink_errno = MESHLINK_ENOMEM;
return false;
}
- //notify event loop
- signal_trigger(&(mesh->loop),&(mesh->datafromapp));
- return true;
-}
+ packet->probe = false;
+ packet->tcp = false;
+ packet->len = len + sizeof(*hdr);
-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;
+ hdr = (meshlink_packethdr_t *)packet->data;
+ memset(hdr, 0, sizeof(*hdr));
+ // leave the last byte as 0 to make sure strings are always
+ // null-terminated if they are longer than the buffer
+ strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
+ strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
- outpacketqueue_t* p = meshlink_queue_pop(&mesh->outpacketqueue);
- if(!p)
- return;
+ memcpy(packet->data + sizeof(*hdr), data, len);
- if (sizeof(meshlink_packethdr_t) + p->len > MAXSIZE) {
- //log something
- return ;
+ // Queue it
+ if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
+ free(packet);
+ meshlink_errno = MESHLINK_ENOMEM;
+ return false;
}
- 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);
+ // Notify event loop
+ signal_trigger(&(mesh->loop), &(mesh->datafromapp));
- packet.len = sizeof *hdr + p->len;
- memcpy(packet.data + sizeof *hdr, p->data, p->len);
+ return true;
+}
+
+void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
+ (void)loop;
+ vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
- mesh->self->in_packets++;
- mesh->self->in_bytes += packet.len;
- route(mesh, mesh->self, &packet);
- return ;
+ if(!packet) {
+ return;
+ }
+
+ mesh->self->in_packets++;
+ mesh->self->in_bytes += packet->len;
+ route(mesh, mesh->self, packet);
}
ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
return -1;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
node_t *n = (node_t *)destination;
- if(!n->status.reachable)
+
+ if(!n->status.reachable) {
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return 0;
- else if(n->mtuprobes > 30 && n->minmtu)
+
+ } else if(n->mtuprobes > 30 && n->minmtu) {
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return n->minmtu;
- else
+ } else {
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return MTU;
+ }
}
char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
return NULL;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
node_t *n = (node_t *)node;
if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
- if(!fingerprint)
+ if(!fingerprint) {
meshlink_errno = MESHLINK_EINTERNAL;
+ }
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return fingerprint;
}
+meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ return (meshlink_node_t *)mesh->self;
+}
+
meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
if(!mesh || !name) {
meshlink_errno = MESHLINK_EINVAL;
return NULL;
}
- return (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
+ meshlink_node_t *node = NULL;
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return node;
}
meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
meshlink_node_t **result;
//lock mesh->nodes
- pthread_mutex_lock(&(mesh->nodes_mutex));
+ pthread_mutex_lock(&(mesh->mesh_mutex));
*nmemb = mesh->nodes->count;
- result = realloc(nodes, *nmemb * sizeof *nodes);
+ result = realloc(nodes, *nmemb * sizeof(*nodes));
if(result) {
meshlink_node_t **p = result;
- for splay_each(node_t, n, mesh->nodes)
+
+ 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));
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return result;
}
return false;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
*siglen = MESHLINK_SIGLEN;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return true;
}
return false;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ bool rval = 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;
+ rval = false;
+ } else {
+ rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
}
- return ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return rval;
}
static bool refresh_invitation_key(meshlink_handle_t *mesh) {
char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "invitations", mesh->confbase);
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
+
if(mkdir(filename, 0700) && errno != EEXIST) {
logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
// Count the number of valid invitations, clean up old ones
DIR *dir = opendir(filename);
+
if(!dir) {
logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
time_t deadline = time(NULL) - 604800; // 1 week in the past
while((ent = readdir(dir))) {
- if(strlen(ent->d_name) != 24)
+ 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(snprintf(invname, sizeof(invname), "%s" SLASH "%s", filename, ent->d_name) >= PATH_MAX) {
+ logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "%s", filename, ent->d_name);
+ continue;
+ }
+
if(!stat(invname, &st)) {
- if(mesh->invitation_key && deadline < st.st_mtime)
+ if(mesh->invitation_key && deadline < st.st_mtime) {
count++;
- else
+ } else {
unlink(invname);
+ }
} else {
logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
errno = 0;
logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
closedir(dir);
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
closedir(dir);
- snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
+ 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)
+ if(mesh->invitation_key) {
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return true;
+ }
// Create a new key if necessary.
- FILE *f = fopen(filename, "r");
+ FILE *f = fopen(filename, "rb");
+
if(!f) {
if(errno != ENOENT) {
logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
mesh->invitation_key = ecdsa_generate();
+
if(!mesh->invitation_key) {
logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
- f = fopen(filename, "w");
+
+ f = fopen(filename, "wb");
+
if(!f) {
logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
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) {
logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
meshlink_errno = MESHLINK_ESTORAGE;
}
}
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return mesh->invitation_key;
}
-bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
- if(!mesh || !address) {
+bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
+ if(!mesh || !node || !address) {
meshlink_errno = MESHLINK_EINVAL;
return false;
}
- for(const char *p = address; *p; p++) {
- if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
- continue;
+ if(!is_valid_hostname(address)) {
logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
meshlink_errno = MESHLINK_EINVAL;
return false;
}
- return append_config_file(mesh, mesh->self->name, "Address", address);
+ if(port && !is_valid_port(port)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ char *canonical_address;
+
+ if(port) {
+ xasprintf(&canonical_address, "%s %s", address, port);
+ } else {
+ canonical_address = xstrdup(address);
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ bool rval = modify_config_file(mesh, node->name, "CanonicalAddress", canonical_address, 1);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+
+ free(canonical_address);
+ return rval;
+}
+
+bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
+ return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
+}
+
+bool meshlink_add_external_address(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ char *address = meshlink_get_external_address(mesh);
+
+ if(!address) {
+ return false;
+ }
+
+ bool rval = false;
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ rval = append_config_file(mesh, mesh->self->name, "Address", address);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+
+ free(address);
+ return rval;
+}
+
+int meshlink_get_port(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
+
+ if(!mesh->myport) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return -1;
+ }
+
+ return atoi(mesh->myport);
+}
+
+bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
+ if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(mesh->myport && port == atoi(mesh->myport)) {
+ return true;
+ }
+
+ if(!try_bind(port)) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
+ }
+
+ bool rval = false;
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ if(mesh->threadstarted) {
+ meshlink_errno = MESHLINK_EINVAL;
+ goto done;
+ }
+
+ close_network_connections(mesh);
+ exit_configuration(&mesh->config);
+
+ char portstr[10];
+ snprintf(portstr, sizeof(portstr), "%d", port);
+ portstr[sizeof(portstr) - 1] = 0;
+
+ modify_config_file(mesh, mesh->name, "Port", portstr, true);
+
+ init_configuration(&mesh->config);
+
+ if(!read_server_config(mesh)) {
+ meshlink_errno = MESHLINK_ESTORAGE;
+ } else if(!setup_network(mesh)) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ } else {
+ rval = true;
+ }
+
+done:
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+
+ return rval;
+}
+
+void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
+ mesh->invitation_timeout = timeout;
}
char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
return NULL;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
// Check validity of the new node's name
if(!check_id(name)) {
logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
meshlink_errno = MESHLINK_EINVAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
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);
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+
if(!access(filename, F_OK)) {
logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
meshlink_errno = MESHLINK_EEXIST;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
if(meshlink_get_node(mesh, name)) {
logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
meshlink_errno = MESHLINK_EEXIST;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
// Get the local address
char *address = get_my_hostname(mesh);
+
if(!address) {
logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
meshlink_errno = MESHLINK_ERESOLV;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
if(!refresh_invitation_key(mesh)) {
meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
char buf[18 + strlen(fingerprint)];
char cookiehash[64];
memcpy(buf, cookie, 18);
- memcpy(buf + 18, fingerprint, sizeof buf - 18);
- sha512(buf, sizeof buf, cookiehash);
+ 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);
+ 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) {
logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
+
FILE *f = fdopen(ifd, "w");
- if(!f)
+
+ 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);
+ 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)) {
+
+ while(fgets(buf, sizeof(buf), tc)) {
if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
- || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
+ || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
fputs(buf, f);
+
// Make sure there is a newline character.
- if(!strchr(buf, '\n'))
+ if(!strchr(buf, '\n')) {
fputc('\n', f);
+ }
}
}
+
fclose(tc);
} else {
logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
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);
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
fcopy(f, filename);
fclose(f);
xasprintf(&url, "%s/%s%s", address, hash, cookie);
free(address);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return url;
}
return false;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ //Before doing meshlink_join make sure we are not connected to another mesh
+ if(mesh->threadstarted) {
+ logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ 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.
+ // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
char *slash = strchr(copy, '/');
- if(!slash)
+
+ if(!slash) {
goto invalid;
+ }
*slash++ = 0;
- if(strlen(slash) != 48)
+ 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)
- goto invalid;
- if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18))
+ 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;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
char *b64key = ecdsa_get_base64_public_key(key);
+ char *comma;
+ mesh->sock = -1;
- //Before doing meshlink_join make sure we are not connected to another mesh
- if ( mesh->threadstarted ){
- goto invalid;
- }
+ while(address && *address) {
+ // We allow commas in the address part to support multiple addresses in one invitation URL.
+ comma = strchr(address, ',');
- // 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;
- }
+ if(comma) {
+ *comma++ = 0;
+ }
- mesh->sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
- if(mesh->sock <= 0) {
- logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
- freeaddrinfo(ai);
- meshlink_errno = MESHLINK_ENETWORK;
- return false;
+ // Split of the port
+ port = strrchr(address, ':');
+
+ if(!port) {
+ goto invalid;
+ }
+
+ *port++ = 0;
+
+ // IPv6 address are enclosed in brackets, per RFC 3986
+ if(*address == '[') {
+ address++;
+ char *bracket = strchr(address, ']');
+
+ if(!bracket) {
+ goto invalid;
+ }
+
+ *bracket++ = 0;
+
+ if(*bracket) {
+ goto invalid;
+ }
+ }
+
+ // Connect to the meshlink daemon mentioned in the URL.
+ struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
+
+ if(ai) {
+ for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
+ mesh->sock = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
+
+ if(mesh->sock == -1) {
+ logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
+ meshlink_errno = MESHLINK_ENETWORK;
+ continue;
+ }
+
+ set_timeout(mesh->sock, 5000);
+
+ if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
+ logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
+ meshlink_errno = MESHLINK_ENETWORK;
+ closesocket(mesh->sock);
+ mesh->sock = -1;
+ continue;
+ }
+ }
+
+ freeaddrinfo(ai);
+ } else {
+ meshlink_errno = MESHLINK_ERESOLV;
+ }
+
+ if(mesh->sock != -1 || !comma) {
+ break;
+ }
+
+ address = comma;
}
- if(connect(mesh->sock, ai->ai_addr, ai->ai_addrlen)) {
- logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
- closesocket(mesh->sock);
- freeaddrinfo(ai);
- meshlink_errno = MESHLINK_ENETWORK;
+ if(mesh->sock == -1) {
+ pthread_mutex_unlock(&mesh->mesh_mutex);
return false;
}
- freeaddrinfo(ai);
-
logger(mesh, MESHLINK_DEBUG, "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)) {
+ if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, 1, mesh->appname)) {
logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
closesocket(mesh->sock);
meshlink_errno = MESHLINK_ENETWORK;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
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) {
+ 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) {
logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
closesocket(mesh->sock);
meshlink_errno = MESHLINK_ENETWORK;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
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)) {
logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
+
if(memcmp(hishash, mesh->hash, 18)) {
logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
meshlink_errno = MESHLINK_EPEER;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
+
if(!hiskey) {
meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
// Start an SPTPS session
- if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, "meshlink invitation", 15, invitation_send, invitation_receive)) {
+ if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
// Feed rest of input buffer to SPTPS
if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
meshlink_errno = MESHLINK_EPEER;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
int len;
- while((len = recv(mesh->sock, mesh->line, sizeof mesh->line, 0))) {
+ while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
if(len < 0) {
- if(errno == EINTR)
+ if(errno == EINTR) {
continue;
+ }
+
logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
meshlink_errno = MESHLINK_ENETWORK;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
meshlink_errno = MESHLINK_EPEER;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
}
if(!mesh->success) {
logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
meshlink_errno = MESHLINK_EPEER;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return true;
invalid:
- logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL or you are already connected to a Mesh ?\n");
+ logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
meshlink_errno = MESHLINK_EINVAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
return NULL;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
FILE *f = fopen(filename, "r");
+
if(!f) {
logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
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) {
logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno));
fclose(f);
+ free(buf);
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
fclose(f);
buf[len - 1] = 0;
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return buf;
}
return false;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
if(strncmp(data, "Name = ", 7)) {
logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
meshlink_errno = MESHLINK_EPEER;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
char *end = strchr(data + 7, '\n');
+
if(!end) {
logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
meshlink_errno = MESHLINK_EPEER;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
char name[len + 1];
memcpy(name, data + 7, len);
name[len] = 0;
+
if(!check_id(name)) {
logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
meshlink_errno = MESHLINK_EPEER;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+
if(!access(filename, F_OK)) {
logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename);
meshlink_errno = MESHLINK_EEXIST;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
if(errno != ENOENT) {
logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
FILE *f = fopen(filename, "w");
+
if(!f) {
logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return false;
}
load_all_nodes(mesh);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return true;
}
return;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
node_t *n;
- n = (node_t*)node;
- n->status.blacklisted=true;
- logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n",node->name);
+ n = (node_t *)node;
+ n->status.blacklisted = true;
+ logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
//Make blacklisting persistent in the config file
append_config_file(mesh, n->name, "blacklisted", "yes");
- return;
+ //Immediately terminate any connections we have with the blacklisted node
+ for list_each(connection_t, c, mesh->connections) {
+ if(c->node == n) {
+ terminate_connection(mesh, c, c->status.active);
+ }
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
}
void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
return;
}
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
node_t *n = (node_t *)node;
n->status.blacklisted = false;
//TODO: remove blacklisted = yes from the config file
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
return;
}
+void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
+ mesh->default_blacklist = blacklist;
+}
+
/* Hint that a hostname may be found at an address
* See header file for detailed comment.
*/
-extern void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
- if(!mesh || !node || !addr)
+void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
+ if(!mesh || !node || !addr) {
return;
-
+ }
+
+ // Ignore hints about ourself.
+ if((node_t *)node == mesh->self) {
+ return;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
char *host = NULL, *port = NULL, *str = NULL;
sockaddr2str((const sockaddr_t *)addr, &host, &port);
if(host && port) {
xasprintf(&str, "%s %s", host, port);
- append_config_file(mesh, node->name, "Address", str);
+
+ if((strncmp("fe80", host, 4) != 0) && (strncmp("127.", host, 4) != 0) && (strcmp("localhost", host) != 0)) {
+ modify_config_file(mesh, node->name, "Address", str, 5);
+ } else {
+ logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
+ }
}
free(str);
free(host);
free(port);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
// @TODO do we want to fire off a connection attempt right away?
}
+static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
+ (void)port;
+ node_t *n = utcp->priv;
+ meshlink_handle_t *mesh = n->mesh;
+ return mesh->channel_accept_cb;
+}
+
+static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
+ meshlink_channel_t *channel = connection->priv;
+
+ if(!channel) {
+ abort();
+ }
+
+ node_t *n = channel->node;
+ meshlink_handle_t *mesh = n->mesh;
+
+ if(n->status.destroyed) {
+ meshlink_channel_close(mesh, channel);
+ } else if(channel->receive_cb) {
+ channel->receive_cb(mesh, channel, data, len);
+ }
+
+ return len;
+}
+
+static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
+ node_t *n = utcp_connection->utcp->priv;
+
+ if(!n) {
+ abort();
+ }
+
+ meshlink_handle_t *mesh = n->mesh;
+
+ if(!mesh->channel_accept_cb) {
+ return;
+ }
+
+ meshlink_channel_t *channel = xzalloc(sizeof(*channel));
+ channel->node = n;
+ channel->c = utcp_connection;
+
+ if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
+ utcp_accept(utcp_connection, channel_recv, channel);
+ } else {
+ free(channel);
+ }
+}
+
+static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
+ node_t *n = utcp->priv;
+
+ if(n->status.destroyed) {
+ return -1;
+ }
+
+ meshlink_handle_t *mesh = n->mesh;
+ return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
+}
+
+void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ channel->receive_cb = cb;
+}
+
+static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
+ (void)mesh;
+ node_t *n = (node_t *)source;
+
+ if(!n->utcp) {
+ abort();
+ }
+
+ utcp_recv(n->utcp, data, len);
+}
+
+static void channel_poll(struct utcp_connection *connection, size_t len) {
+ meshlink_channel_t *channel = connection->priv;
+
+ if(!channel) {
+ abort();
+ }
+
+ node_t *n = channel->node;
+ meshlink_handle_t *mesh = n->mesh;
+
+ if(channel->poll_cb) {
+ channel->poll_cb(mesh, channel, len);
+ }
+}
+
+void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
+ (void)mesh;
+ channel->poll_cb = cb;
+ utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
+}
+
+void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ pthread_mutex_lock(&mesh->mesh_mutex);
+ mesh->channel_accept_cb = cb;
+ mesh->receive_cb = channel_receive;
+
+ for splay_each(node_t, n, mesh->nodes) {
+ if(!n->utcp && n != mesh->self) {
+ n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
+ }
+ }
+
+ pthread_mutex_unlock(&mesh->mesh_mutex);
+}
+
+meshlink_channel_t *meshlink_channel_open_ex(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len, uint32_t flags) {
+ if(data || len) {
+ abort(); // TODO: handle non-NULL data
+ }
+
+ if(!mesh || !node) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ node_t *n = (node_t *)node;
+
+ if(!n->utcp) {
+ n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
+ mesh->receive_cb = channel_receive;
+
+ if(!n->utcp) {
+ meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
+ return NULL;
+ }
+ }
+
+ meshlink_channel_t *channel = xzalloc(sizeof(*channel));
+ channel->node = n;
+ channel->receive_cb = cb;
+ channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
+
+ if(!channel->c) {
+ meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
+ free(channel);
+ return NULL;
+ }
+
+ return channel;
+}
+
+meshlink_channel_t *meshlink_channel_open(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len) {
+ return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
+}
+
+void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ utcp_shutdown(channel->c, direction);
+}
+
+void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ utcp_close(channel->c);
+ free(channel);
+}
+
+ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
+
+ if(!len) {
+ return 0;
+ }
+
+ if(!data) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
+
+ // TODO: more finegrained locking.
+ // Ideally we want to put the data into the UTCP connection's send buffer.
+ // Then, preferrably only if there is room in the receiver window,
+ // kick the meshlink thread to go send packets.
+
+ pthread_mutex_lock(&mesh->mesh_mutex);
+ ssize_t retval = utcp_send(channel->c, data, len);
+ pthread_mutex_unlock(&mesh->mesh_mutex);
+
+ if(retval < 0) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ }
+
+ return retval;
+}
+
+uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
+
+ return channel->c->flags;
+}
+
+void update_node_status(meshlink_handle_t *mesh, node_t *n) {
+ if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
+ n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
+ }
+
+ if(mesh->node_status_cb) {
+ mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable);
+ }
+}
+
+void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
+ if(!mesh->node_duplicate_cb || n->status.duplicate) {
+ return;
+ }
+
+ n->status.duplicate = true;
+ mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
+}
+
+void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
+#if HAVE_CATTA
+
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ pthread_mutex_lock(&mesh->mesh_mutex);
+
+ if(mesh->discovery == enable) {
+ goto end;
+ }
+
+ if(mesh->threadstarted) {
+ if(enable) {
+ discovery_start(mesh);
+ } else {
+ discovery_stop(mesh);
+ }
+ }
+
+ mesh->discovery = enable;
+
+end:
+ pthread_mutex_unlock(&mesh->mesh_mutex);
+#else
+ (void)mesh;
+ (void)enable;
+ meshlink_errno = MESHLINK_ENOTSUP;
+#endif
+}
+
static void __attribute__((constructor)) meshlink_init(void) {
crypto_init();
+ unsigned int seed;
+ randomize(&seed, sizeof(seed));
+ srand(seed);
}
static void __attribute__((destructor)) meshlink_exit(void) {
crypto_exit();
}
-
/// Device class traits
-dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX +1] = {
- { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
- { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
- { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
- { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
+dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = {
+ { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
+ { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
+ { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
+ { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
};
projects / meshlink / blobdiff