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authorHolger Hans Peter Freyther <holger@moiji-mobile.com>2015-06-10 11:51:16 +0200
committerHolger Hans Peter Freyther <holger@moiji-mobile.com>2015-07-01 08:16:40 +0200
commit8a8df80772a4bac0f3cb4d384f45a5d4c463fe11 (patch)
tree2038fe325af8dae15577efbbdfdf36de4425c50c /openbsc/src/osmo-bsc_nat
parent0363d1bb97663e83aa0dc3a1e6b425b1870dd271 (diff)
bsc/nat: Fix the structure of the identity request message
Unfortunately the basic structure of the response is broken. There is a two byte length followed by data. The concept of a 'tag' happens to be the first byte of the data. This means we want to write strlen of the token, then we want to write the NUL and then we need to account for the tag in front. Introduce a flag if the new or old format should be used. This will allow to have new BSCs talk to old NATs without an additional change. In the long run we can clean that up.
Diffstat (limited to 'openbsc/src/osmo-bsc_nat')
-rw-r--r--openbsc/src/osmo-bsc_nat/bsc_nat.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat.c b/openbsc/src/osmo-bsc_nat/bsc_nat.c
index 9216654..841262c 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat.c
@@ -357,7 +357,7 @@ static void initialize_msc_if_needed(struct bsc_msc_connection *msc_con)
static void send_id_get_response(struct bsc_msc_connection *msc_con)
{
- struct msgb *msg = bsc_msc_id_get_resp(nat->token);
+ struct msgb *msg = bsc_msc_id_get_resp(0, nat->token);
if (!msg)
return;
@@ -960,7 +960,7 @@ static void ipaccess_auth_bsc(struct tlv_parsed *tvp, struct bsc_connection *bsc
{
struct bsc_config *conf;
const char *token = (const char *) TLVP_VAL(tvp, IPAC_IDTAG_UNITNAME);
- const int len = TLVP_LEN(tvp, IPAC_IDTAG_UNITNAME);
+ int len = TLVP_LEN(tvp, IPAC_IDTAG_UNITNAME);
if (bsc->cfg) {
LOGP(DNAT, LOGL_ERROR, "Reauth on fd %d bsc nr %d\n",
@@ -980,11 +980,18 @@ static void ipaccess_auth_bsc(struct tlv_parsed *tvp, struct bsc_connection *bsc
return;
}
+ /*
+ * New systems have fixed the structure of the message but
+ * we need to support old ones too.
+ */
+ if (len >= 2 && token[len - 2] == '\0')
+ len -= 1;
+
conf = bsc_config_by_token(bsc->nat, token, len);
if (!conf) {
LOGP(DNAT, LOGL_ERROR,
- "No bsc found for token '%s' on fd: %d.\n", token,
- bsc->write_queue.bfd.fd);
+ "No bsc found for token '%s' len %d on fd: %d.\n", token,
+ bsc->write_queue.bfd.fd, len);
bsc_close_connection(bsc);
return;
}