gsm: Verify the MNCC_VERSION of the BSC/MS and close the socket on mismatch

[lcr.git] / gsm.cpp

diff --git a/gsm.cpp b/gsm.cpp
index 50ca2ea..5fbbd49 100644 (file)
--- a/gsm.cpp
+++ b/gsm.cpp
@@ -1334,6 +1334,7 @@ static int mncc_fd_read(struct lcr_fd *lfd, void *inst, int idx)
        int rc;
        static char buf[sizeof(struct gsm_mncc)+1024];
        struct gsm_mncc *mncc_prim = (struct gsm_mncc *) buf;
+       struct gsm_mncc_hello *hello = (struct gsm_mncc_hello *) buf;
 
        memset(buf, 0, sizeof(buf));
        rc = recv(lfd->fd, buf, sizeof(buf), 0);
@@ -1342,6 +1343,17 @@ static int mncc_fd_read(struct lcr_fd *lfd, void *inst, int idx)
        if (rc < 0)
                return rc;
 
+       /* TODO: size check? */
+       switch (mncc_prim->msg_type) {
+       case MNCC_SOCKET_HELLO:
+               if (hello->version != MNCC_SOCK_VERSION) {
+                       PERROR("MNCC version different. BSC version is %u\n", hello->version);
+                       mncc_fd_close(lcr_gsm, lfd);
+                       return 0;
+               }
+               break;
+       }
+
        /* Hand the MNCC message into LCR */
        switch (lcr_gsm->type) {
 #ifdef WITH_GSM_BS