/**
* initialize our plugin library. Pass the DLT of the source pcap handle.
* Actions:
* - Create new tcpeditdlt_t context
* - Link tcpedit to new context
* - Register plugins
* - Select decoder plugin using srcdlt
* - Select encoder plugin using destination name
* - Initialize decoder/encoder plugins
* - Parse options for encoder plugin
* - Validate provides/reqiures + user options
*/
tcpeditdlt_t *
tcpedit_dlt_init(tcpedit_t *tcpedit, const int srcdlt)
{
tcpeditdlt_t *ctx;
int rcode;
assert(tcpedit);
assert(srcdlt >= 0);
ctx = (tcpeditdlt_t *)safe_malloc(sizeof(tcpeditdlt_t));
/* do we need a side buffer for L3 data? */
#ifdef FORCE_ALIGN
ctx->l3buff = (u_char *)safe_malloc(MAXPACKET);
#endif
/* copy our tcpedit context */
ctx->tcpedit = tcpedit;
/* register all our plugins */
if (tcpedit_dlt_register(ctx) != TCPEDIT_OK) {
tcpedit_dlt_cleanup(ctx);
return NULL;
}
/* Choose decode plugin */
if ((ctx->decoder = tcpedit_dlt_getplugin(ctx, srcdlt)) == NULL) {
tcpedit_seterr(tcpedit, "No DLT plugin available for source DLT: 0x%x", srcdlt);
tcpedit_dlt_cleanup(ctx);
return NULL;
}
/* set our dlt type */
ctx->dlt = srcdlt;
/* set our address type */
ctx->addr_type = ctx->decoder->plugin_l2addr_type();
/* initalize decoder plugin */
rcode = ctx->decoder->plugin_init(ctx);
if (tcpedit_checkerror(ctx->tcpedit, rcode, NULL) != TCPEDIT_OK) {
tcpedit_dlt_cleanup(ctx);
return NULL;
}
/* we're OK */
return ctx;
}
/*
* Since this is used in a library, we should manually clean up after ourselves
* Unless you allocated some memory in dlt_jnpr_ether_init(), this is just an stub.
* Returns: TCPEDIT_ERROR | TCPEDIT_OK | TCPEDIT_WARN
*/
int
dlt_jnpr_ether_cleanup(tcpeditdlt_t *ctx)
{
tcpeditdlt_plugin_t *plugin;
jnpr_ether_config_t *config;
assert(ctx);
if ((plugin = tcpedit_dlt_getplugin(ctx, dlt_value)) == NULL) {
tcpedit_seterr(ctx->tcpedit, "Unable to cleanup unregistered plugin %s", dlt_name);
return TCPEDIT_ERROR;
}
if (ctx->decoded_extra != NULL) {
safe_free(ctx->decoded_extra);
ctx->decoded_extra = NULL;
}
if (plugin->config != NULL) {
/* clean up the en10mb plugin */
config = (jnpr_ether_config_t *)ctx->encoder->config;
tcpedit_dlt_cleanup(config->subctx);
plugin->config = NULL;
}
return TCPEDIT_OK; /* success */
}
