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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <net/if.h>
/* maybe just use
http://cjson.sourceforge.net/
or maybe even better:
https://bitbucket.org/zserge/jsmn/src
for the parsing? *
/* parse downstream configuration file
format:
port;vlan;remote-id;subscriber-id;trusted
port:
interface name
vlan:
vlanid || 0
remote-id:
string for REMOTE-ID attribute (requires enterprise number as input option)
subscriber-id:
string for SUBSCRIBER-ID attribute
trusted:
boolean 0 || 1 indicating whether we allow RELAY-FORW messages from this port
example:
eth2;604;123abc;hansen;0
output:
we combine port+vlan into a 32bit value which is used directly as the INTERFACE-ID key
a structure is allocated with pointers to the remote-id and
a rather large structure is allocated for each new port:
*/
/* flags */
#define SUB_F_TRUSTED 1
#define SUB_F_ALL SUB_F_TRUSTED
/* suscriber struct */
struct subscriber {
int interfaceid;
int flags;
char *remoteid;
char *subscriberid;
};
/* bintree structure */
struct e_btree {
struct subscriber data;
struct e_btree *l,*r;
};
static struct e_btree *head = NULL;
/* simple recursive bintree insert */
struct e_btree *binsert(struct e_btree **p, struct subscriber *data)
{
if (!*p) {
*p = malloc(sizeof(struct e_btree));
if (!*p)
return NULL; /* malloc failed? */
(*p)->l = NULL;
(*p)->r = NULL;
memcpy(&(*p)->data, data, sizeof(struct subscriber));
return *p;
}
if (data->interfaceid < (*p)->data.interfaceid) {
fprintf(stderr, "%d < %d\n", data->interfaceid, (*p)->data.interfaceid);
return binsert(&(*p)->l, data);
}
fprintf(stderr, "%d > %d\n", data->interfaceid, (*p)->data.interfaceid);
return binsert(&(*p)->r, data);
}
/* simple recursive bintree shift() */
struct subscriber *bshift(struct e_btree **p, struct subscriber *e)
{
static int level = 0;
if (!*p)
return NULL; /* finished */
/* dump right tree */
if ((*p)->r)
bshift(&(*p)->r, e);
/* we can now finish this node */
fprintf(stderr, "going to return ifid=%d now\n", (*p)->data.interfaceid);
/* dump left tree */
if ((*p)->l)
bshift(&(*p)->l, e);
/* memcpy(e, &(*p)->data, sizeof(*e));
free(*p);
*p = NULL;
return e;
*/
return NULL;
}
/* global array holding all the entries */
static struct subscriber sentry[];
static int nsubscribers = 0;
/* strategy:
dynamically allocate entries as they are parsed and temporarily store them in a bintree
allocate an array which is just big enough after parsing
store all entries *sorted* in the array
the reason for not keeping the bintree is that it most likely is very sub-optimal, as the
data typically will appear in a semi-sorted order in the configuration file
use binary search when looking up an entry
note that lookup is only necessary for down => up packets
*/
int parse_config(char *fname)
{
FILE *f;
int n, i = 0;
char ifname[IFNAMSIZ];
struct subscriber e;
f = fopen(fname, "r");
if (!f) {
fprintf(stderr, "%s(): cannot open configuration file \"%s\": %m\n", __FUNCTION__, fname);
return -1;
}
while (n = fscanf(f, " %[^;] ; %u ; %m[^;] ; %m[^;] ; %u ; ", &ifname, &e.interfaceid, &e.remoteid, &e.subscriberid, &e.flags) > 0) {
/* FIXME: do cached lookup of ifindex for ifname and add to interfaceid */
e.interfaceid &= 0xfff; /* VLAN tags are 12bit only */
e.flags &= SUB_F_ALL; /* mask out invalid flags */
fprintf(stderr, "parsed entry %d (ifname=%s, ifid=%d)\n", i, ifname, e.interfaceid);
binsert(&head, &e);
i++;
}
fclose(f);
}
int main(int argc, char *argv[])
{
struct subscriber e;
if (argc < 2)
return -1;
parse_config(argv[1]);
while (bshift(&head, &e))
;;
// fprintf(stderr, "ifid=%d, rid=%s, sid=%s, flags=%d\n", e.interfaceid, e.remoteid, e.subscriberid, e.flags);
return 0;
}
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