13 Nov
2015
13 Nov
'15
3:57 p.m.
The definition of the APN field format in GTPv1 is hidden in a chain
of documents.
3GPP TS 29.060 (the GTPv1-C specification) Section 7.7.30:
The Access Point Name contains a logical name (see
3GPP TS 23.060 [4]).
It is coded as in the value part defined in 3GPP TS 24.008
3GPP TS 24.008 Section 10.5.6.1:
The value part is defined in 3GPP TS 23.003.
3GPP TS 23.003 Section 9.1:
The APN consists of one or more labels. Each label is
coded as a one
octet length field followed by that number of octets coded as 8 bit
ASCII characters
This converts a literal APN (e.g. Label1.Label2.Label3) to a structured
field (e.g. \006Label1\006Label2\006Label3)
Signed-off-by: Andreas Schultz <aschultz(a)tpip.net>
---
sgsnemu/sgsnemu.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/sgsnemu/sgsnemu.c b/sgsnemu/sgsnemu.c
index 5b56751..832bd97 100644
--- a/sgsnemu/sgsnemu.c
+++ b/sgsnemu/sgsnemu.c
@@ -231,6 +231,7 @@ int process_options(int argc, char **argv)
char *type;
char *mcc;
char *mnc;
+ char *tok, *apn;
char *lac;
int lac_d;
char *rest;
@@ -534,10 +535,19 @@ int process_options(int argc, char **argv)
printf("Invalid APN\n");
return -1;
}
- options.apn.l = strlen(args_info.apn_arg);
- strncpy((char *)options.apn.v, args_info.apn_arg,
- sizeof(options.apn.v));
- options.apn.v[sizeof(options.apn.v) - 1] = 0;
+ options.apn.l = strlen(args_info.apn_arg) + 1;
+
+ apn = (char *)options.apn.v;
+ for (tok = strtok(args_info.apn_arg, ".");
+ tok != NULL;
+ tok = strtok(NULL, ".")) {
+ size_t len = strlen(tok);
+
+ *apn++ = (char)len;
+ strncpy(apn, tok, len);
+ apn += len;
+ }
+
printf("Using APN: %s\n", args_info.apn_arg);
/* selmode */
--
2.5.0