Replace rand() by xoshiro256** with per-mesh state.

[meshlink] / src / discovery.c

diff --git a/src/discovery.c b/src/discovery.c
index 2af4702365e6b652c543bb9279371f12f19b83ad..323d22cfdf433438b51e44692132c46ca2455fb0 100644 (file)
--- a/src/discovery.c
+++ b/src/discovery.c
@@ -21,11 +21,11 @@
 #define MESHLINK_MDNS_NAME_KEY "name"
 #define MESHLINK_MDNS_FINGERPRINT_KEY "fingerprint"
 
-static void generate_rand_string(char *buffer, size_t size) {
+static void generate_rand_string(meshlink_handle_t *mesh, char *buffer, size_t size) {
        assert(size);
 
        for(size_t i = 0; i < (size - 1); ++i) {
-               buffer[i] = 'a' + (rand() % ('z' - 'a' + 1));
+               buffer[i] = 'a' + prng(mesh, 'z' - 'a' + 1);
        }
 
        buffer[size - 1] = '\0';
@@ -141,7 +141,7 @@ static void discovery_server_callback(CattaServer *server, CattaServerState stat
        case CATTA_SERVER_COLLISION: {
                /* A host name collision happened. Let's pick a new name for the server */
                char hostname[17];
-               generate_rand_string(hostname, sizeof(hostname));
+               generate_rand_string(mesh, hostname, sizeof(hostname));
 
                pthread_mutex_lock(&(mesh->mesh_mutex));
 
@@ -379,7 +379,7 @@ static void *discovery_loop(void *userdata) {
 
        // generate some unique host name (we actually do not care about it)
        char hostname[17];
-       generate_rand_string(hostname, sizeof(hostname));
+       generate_rand_string(mesh, hostname, sizeof(hostname));
 
        // Let's set the host name for this server.
        CattaServerConfig config;