Implement client-server feature negotiation.
[paraslash.git] / client_common.c
index 5bd2241..e34ed64 100644 (file)
@@ -42,6 +42,7 @@ void client_disconnect(struct client_task *ct)
                return;
        if (ct->scc.fd >= 0)
                close(ct->scc.fd);
+       free_argv(ct->features);
        sc_free(ct->scc.recv);
        ct->scc.recv = NULL;
        sc_free(ct->scc.send);
@@ -152,6 +153,31 @@ static int client_recv_buffer(struct client_task *ct, fd_set *rfds,
        return 0;
 }
 
+static char **parse_features(char *buf)
+{
+       int i;
+       const char id[] = "\nFeatures: ";
+       char *p, *q, **features;
+
+       p = strstr(buf, id);
+       if (!p)
+               return NULL;
+       p += strlen(id);
+       q = strchr(p, '\n');
+       if (!q)
+               return NULL;
+       *q = '\0';
+       create_argv(p, ",", &features);
+       for (i = 0; features[i]; i++)
+               PARA_INFO_LOG("server feature: %s\n", features[i]);
+       return features;
+}
+
+static bool has_feature(const char *feature, struct client_task *ct)
+{
+       return find_arg(feature, ct->features) >= 0? true : false;
+}
+
 /**
  * The post select hook for client commands.
  *
@@ -181,13 +207,18 @@ static void client_post_select(struct sched *s, struct task *t)
                ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
                if (ret < 0 || n == 0)
                        goto out;
+               ct->features = parse_features(buf);
                ct->status = CL_RECEIVED_WELCOME;
                return;
        case CL_RECEIVED_WELCOME: /* send auth command */
-               sprintf(buf, AUTH_REQUEST_MSG "%s", ct->user);
-               PARA_INFO_LOG("--> %s\n", buf);
                if (!FD_ISSET(ct->scc.fd, &s->wfds))
                        return;
+               if (has_feature("sideband", ct)) {
+                       ct->use_sideband = true;
+                       sprintf(buf, AUTH_REQUEST_MSG "%s sideband", ct->user);
+               } else
+                       sprintf(buf, AUTH_REQUEST_MSG "%s", ct->user);
+               PARA_INFO_LOG("--> %s\n", buf);
                ret = write_buffer(ct->scc.fd, buf);
                if (ret < 0)
                        goto out;