mncc: Handle the hello message from NITB
Make a simple version comparison and close the socket in case of a version mismatch. Begin to dispatch messages coming from the NITB and log (all) unhandled messages.
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45f0fa09d2
commit
90e7139691
62
src/mncc.c
62
src/mncc.c
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@ -19,6 +19,7 @@
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*/
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#include "mncc.h"
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#include "mncc_protocol.h"
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#include "app.h"
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#include "logging.h"
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@ -30,6 +31,38 @@
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#include <errno.h>
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#include <unistd.h>
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static void close_connection(struct mncc_connection *conn)
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{
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osmo_fd_unregister(&conn->fd);
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close(conn->fd.fd);
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osmo_timer_schedule(&conn->reconnect, 5, 0);
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conn->state = MNCC_DISCONNECTED;
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if (conn->on_disconnect)
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conn->on_disconnect(conn);
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}
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static void check_hello(struct mncc_connection *conn, char *buf, int rc)
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{
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struct gsm_mncc_hello *hello;
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if (rc != sizeof(*hello)) {
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LOGP(DMNCC, LOGL_ERROR, "Hello shorter than expected %d vs. %d\n",
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rc, sizeof(*hello));
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return close_connection(conn);
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}
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hello = (struct gsm_mncc_hello *) buf;
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LOGP(DMNCC, LOGL_NOTICE, "Got hello message version %d\n", hello->version);
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if (hello->version != MNCC_SOCK_VERSION) {
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LOGP(DMNCC, LOGL_NOTICE, "Incompatible version(%d) expected %d\n",
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hello->version, MNCC_SOCK_VERSION);
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return close_connection(conn);
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}
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conn->state = MNCC_READY;
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}
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static void mncc_reconnect(void *data)
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{
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int rc;
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@ -40,16 +73,19 @@ static void mncc_reconnect(void *data)
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if (rc < 0) {
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LOGP(DMNCC, LOGL_ERROR, "Failed to connect(%s). Retrying\n",
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conn->app->mncc.path);
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conn->state = MNCC_DISCONNECTED;
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osmo_timer_schedule(&conn->reconnect, 5, 0);
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return;
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}
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LOGP(DMNCC, LOGL_NOTICE, "Reconnected to %s\n", conn->app->mncc.path);
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conn->state = MNCC_WAIT_VERSION;
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}
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static int mncc_data(struct osmo_fd *fd, unsigned int what)
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{
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char buf[4096];
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uint32_t msg_type;
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int rc;
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struct mncc_connection *conn = fd->data;
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@ -57,14 +93,27 @@ static int mncc_data(struct osmo_fd *fd, unsigned int what)
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if (rc <= 0) {
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LOGP(DMNCC, LOGL_ERROR, "Failed to read %d/%s. Re-connecting.\n",
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rc, strerror(errno));
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osmo_fd_unregister(fd);
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close(fd->fd);
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osmo_timer_schedule(&conn->reconnect, 5, 0);
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if (conn->on_disconnect)
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conn->on_disconnect(conn);
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return 0;
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goto bad_data;
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}
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if (rc <= 4) {
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LOGP(DMNCC, LOGL_ERROR, "Data too short with: %d\n", rc);
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goto bad_data;
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}
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memcpy(&msg_type, buf, 4);
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switch (msg_type) {
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case MNCC_SOCKET_HELLO:
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check_hello(conn, buf, rc);
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break;
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default:
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LOGP(DMNCC, LOGL_ERROR, "Unhandled message type %d/0x%x\n",
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msg_type, msg_type);
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break;
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}
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return 0;
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bad_data:
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close_connection(conn);
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return 0;
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}
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@ -75,6 +124,7 @@ void mncc_connection_init(struct mncc_connection *conn, struct app_config *cfg)
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conn->fd.cb = mncc_data;
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conn->fd.data = conn;
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conn->app = cfg;
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conn->state = MNCC_DISCONNECTED;
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}
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void mncc_connection_start(struct mncc_connection *conn)
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@ -5,7 +5,14 @@
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struct app_config;
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enum {
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MNCC_DISCONNECTED,
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MNCC_WAIT_VERSION,
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MNCC_READY,
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};
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struct mncc_connection {
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int state;
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struct app_config *app;
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struct osmo_fd fd;
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