Initial commit
Change-Id: I6a4444e3c193dae437cd7929f4c39aba7b749efa
diff --git a/extensions/rt_ereg/rtereg.c b/extensions/rt_ereg/rtereg.c
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+++ b/extensions/rt_ereg/rtereg.c
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+/*********************************************************************************************************
+* Software License Agreement (BSD License) *
+* Author: Sebastien Decugis <sdecugis@freediameter.net> *
+* *
+* Copyright (c) 2013, WIDE Project and NICT *
+* All rights reserved. *
+* *
+* Redistribution and use of this software in source and binary forms, with or without modification, are *
+* permitted provided that the following conditions are met: *
+* *
+* * Redistributions of source code must retain the above *
+* copyright notice, this list of conditions and the *
+* following disclaimer. *
+* *
+* * Redistributions in binary form must reproduce the above *
+* copyright notice, this list of conditions and the *
+* following disclaimer in the documentation and/or other *
+* materials provided with the distribution. *
+* *
+* * Neither the name of the WIDE Project or NICT nor the *
+* names of its contributors may be used to endorse or *
+* promote products derived from this software without *
+* specific prior written permission of WIDE Project and *
+* NICT. *
+* *
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
+* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
+* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
+* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
+* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
+* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
+*********************************************************************************************************/
+
+/*
+ * This extension allows to perform some pattern-matching on an AVP
+ * and send the message to a server accordingly.
+ * See rt_ereg.conf.sample file for the format of the configuration file.
+ */
+
+#include "rtereg.h"
+
+/* The configuration structure */
+struct rtereg_conf rtereg_conf;
+
+#ifndef HAVE_REG_STARTEND
+static char * buf = NULL;
+static size_t bufsz;
+static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
+#endif /* HAVE_REG_STARTEND */
+
+static int proceed(char * value, size_t len, struct fd_list * candidates)
+{
+ int i;
+
+ for (i = 0; i < rtereg_conf.rules_nb; i++) {
+ /* Does this pattern match the value? */
+ struct rtereg_rule * r = &rtereg_conf.rules[i];
+ int err = 0;
+ struct fd_list * c;
+
+ TRACE_DEBUG(ANNOYING, "Attempt pattern matching of '%.*s' with rule '%s'", (int)len, value, r->pattern);
+
+ #ifdef HAVE_REG_STARTEND
+ {
+ regmatch_t pmatch[1];
+ memset(pmatch, 0, sizeof(pmatch));
+ pmatch[0].rm_so = 0;
+ pmatch[0].rm_eo = len;
+ err = regexec(&r->preg, value, 0, pmatch, REG_STARTEND);
+ }
+ #else /* HAVE_REG_STARTEND */
+ {
+ /* We have a 0-terminated string */
+ err = regexec(&r->preg, value, 0, NULL, 0);
+ }
+ #endif /* HAVE_REG_STARTEND */
+
+ if (err == REG_NOMATCH)
+ continue;
+
+ if (err != 0) {
+ char * errstr;
+ size_t bl;
+
+ /* Error while compiling the regex */
+ TRACE_DEBUG(INFO, "Error while executing the regular expression '%s':", r->pattern);
+
+ /* Get the error message size */
+ bl = regerror(err, &r->preg, NULL, 0);
+
+ /* Alloc the buffer for error message */
+ CHECK_MALLOC( errstr = malloc(bl) );
+
+ /* Get the error message content */
+ regerror(err, &r->preg, errstr, bl);
+ TRACE_DEBUG(INFO, "\t%s", errstr);
+
+ /* Free the buffer, return the error */
+ free(errstr);
+
+ return (err == REG_ESPACE) ? ENOMEM : EINVAL;
+ }
+
+ /* From this point, the expression matched the AVP value */
+ TRACE_DEBUG(FULL, "[rt_ereg] Match: '%s' to value '%.*s' => '%s' += %d",
+ r->pattern,
+ (int)len,
+ value,
+ r->server,
+ r->score);
+
+ for (c = candidates->next; c != candidates; c = c->next) {
+ struct rtd_candidate * cand = (struct rtd_candidate *)c;
+
+ if (strcmp(r->server, cand->diamid) == 0) {
+ cand->score += r->score;
+ break;
+ }
+ }
+ };
+
+ return 0;
+}
+
+/* The callback called on new messages */
+static int rtereg_out(void * cbdata, struct msg ** pmsg, struct fd_list * candidates)
+{
+ struct msg * msg = *pmsg;
+ struct avp * avp = NULL;
+
+ TRACE_ENTRY("%p %p %p", cbdata, msg, candidates);
+
+ CHECK_PARAMS(msg && candidates);
+
+ /* Check if it is worth processing the message */
+ if (FD_IS_LIST_EMPTY(candidates)) {
+ return 0;
+ }
+
+ /* Now search the AVP in the message */
+ CHECK_FCT( fd_msg_search_avp ( msg, rtereg_conf.avp, &avp ) );
+ if (avp != NULL) {
+ struct avp_hdr * ahdr = NULL;
+ CHECK_FCT( fd_msg_avp_hdr ( avp, &ahdr ) );
+ if (ahdr->avp_value != NULL) {
+#ifndef HAVE_REG_STARTEND
+ int ret;
+
+ /* Lock the buffer */
+ CHECK_POSIX( pthread_mutex_lock(&mtx) );
+
+ /* Augment the buffer if needed */
+ if (ahdr->avp_value->os.len >= bufsz) {
+ CHECK_MALLOC_DO( buf = realloc(buf, ahdr->avp_value->os.len + 1),
+ { pthread_mutex_unlock(&mtx); return ENOMEM; } );
+ }
+
+ /* Copy the AVP value */
+ memcpy(buf, ahdr->avp_value->os.data, ahdr->avp_value->os.len);
+ buf[ahdr->avp_value->os.len] = '\0';
+
+ /* Now apply the rules */
+ ret = proceed(buf, ahdr->avp_value->os.len, candidates);
+
+ CHECK_POSIX(pthread_mutex_unlock(&mtx));
+
+ CHECK_FCT(ret);
+#else /* HAVE_REG_STARTEND */
+ CHECK_FCT( proceed((char *) ahdr->avp_value->os.data, ahdr->avp_value->os.len, candidates) );
+#endif /* HAVE_REG_STARTEND */
+ }
+ }
+
+ return 0;
+}
+
+/* handler */
+static struct fd_rt_out_hdl * rtereg_hdl = NULL;
+
+/* entry point */
+static int rtereg_entry(char * conffile)
+{
+ TRACE_ENTRY("%p", conffile);
+
+ /* Initialize the configuration */
+ memset(&rtereg_conf, 0, sizeof(rtereg_conf));
+
+ /* Parse the configuration file */
+ CHECK_FCT( rtereg_conf_handle(conffile) );
+
+ /* Register the callback */
+ CHECK_FCT( fd_rt_out_register( rtereg_out, NULL, 1, &rtereg_hdl ) );
+
+ /* We're done */
+ return 0;
+}
+
+/* Unload */
+void fd_ext_fini(void)
+{
+ int i;
+ TRACE_ENTRY();
+
+ /* Unregister the cb */
+ CHECK_FCT_DO( fd_rt_out_unregister ( rtereg_hdl, NULL ), /* continue */ );
+
+ /* Destroy the data */
+ if (rtereg_conf.rules)
+ for (i = 0; i < rtereg_conf.rules_nb; i++) {
+ free(rtereg_conf.rules[i].pattern);
+ free(rtereg_conf.rules[i].server);
+ regfree(&rtereg_conf.rules[i].preg);
+ }
+ free(rtereg_conf.rules);
+#ifndef HAVE_REG_STARTEND
+ free(buf);
+#endif /* HAVE_REG_STARTEND */
+
+ /* Done */
+ return ;
+}
+
+EXTENSION_ENTRY("rt_ereg", rtereg_entry);