static int replace(char *buf, int size, const char * pattern, char *rp) {
regex_t regex;
int regex_error;
if ((regex_error = regcomp(®ex, pattern, REG_EXTENDED)) != 0) {
char buffer[1024];
regerror(regex_error, ®ex, buffer, sizeof(buffer));
fatal("Error compiling REGEX: %s", buffer);
} else if (rreplace(buf, size, ®ex, rp)) {
fatal("Error doing regex replace");
} else {
regfree(®ex);
}
return 0;
}
/* private plugin code */
static int plugin_regex_redirect(sip_ticket_t *ticket) {
osip_uri_t *to_url=ticket->sipmsg->to->url;
char *url_string=NULL;
osip_uri_t *new_to_url;
int i, sts;
osip_contact_t *contact = NULL;
/* character workspaces for regex */
#define WORKSPACE_SIZE 128
static char in[WORKSPACE_SIZE+1], rp[WORKSPACE_SIZE+1];
/* do apply to full To URI... */
sts = osip_uri_to_str(to_url, &url_string);
if (sts != 0) {
ERROR("osip_uri_to_str() failed");
return STS_FAILURE;
}
DEBUGC(DBCLASS_BABBLE, "To URI string: [%s]", url_string);
/* perform search and replace of the regexes, first match hits */
for (i = 0; i < plugin_cfg.regex_pattern.used; i++) {
regmatch_t *pmatch = NULL;
pmatch = rmatch(url_string, WORKSPACE_SIZE, &re[i]);
if (pmatch == NULL) continue; /* no match, next */
/* have a match, do the replacement */
INFO("Matched rexec rule: %s",plugin_cfg.regex_desc.string[i] );
strncpy (in, url_string, WORKSPACE_SIZE);
in[WORKSPACE_SIZE]='\0';
strncpy (rp, plugin_cfg.regex_replace.string[i], WORKSPACE_SIZE);
rp[WORKSPACE_SIZE]='\0';
sts = rreplace(in, WORKSPACE_SIZE, &re[i], pmatch, rp);
if (sts != STS_SUCCESS) {
ERROR("regex replace failed: pattern:[%s] replace:[%s]",
plugin_cfg.regex_pattern.string[i],
plugin_cfg.regex_replace.string[i]);
osip_free(url_string);
return STS_FAILURE;
}
/* only do first match */
break;
}
if (i >= plugin_cfg.regex_pattern.used) {
/* no match */
osip_free(url_string);
return STS_SUCCESS;
}
/* in: contains the new string */
sts = osip_uri_init(&new_to_url);
if (sts != 0) {
ERROR("Unable to initialize URI");
osip_free(url_string);
return STS_FAILURE;
}
sts = osip_uri_parse(new_to_url, in);
if (sts != 0) {
ERROR("Unable to parse To URI: %s", in);
osip_uri_free(new_to_url);
osip_free(url_string);
return STS_FAILURE;
}
/* use a "302 Moved temporarily" response back to the client */
/* new target is within the Contact Header */
/* remove all Contact headers in message */
for (i=0; (contact != NULL) || (i == 0); i++) {
osip_message_get_contact(ticket->sipmsg, 0, &contact);
if (contact) {
osip_list_remove(&(ticket->sipmsg->contacts),0);
osip_contact_free(contact);
}
} /* for i */
/* insert one new Contact header containing the new target address */
osip_contact_init(&contact);
osip_list_add(&(ticket->sipmsg->contacts),contact,0);
/* link the new_to_url into the Contact list */
contact->url = new_to_url;
new_to_url = NULL;
/*
* Add the 'REDIRECTED_TAG=REDIRECTED_VAL' parameter to URI. Required to figure out
* if this INVITE has already been processed (redirected) and
* does not need further attention by this plugin.
* THIS IS REQUIRED TO AVOID A LOOP
*/
osip_uri_param_add(&(contact->url->url_params), osip_strdup(REDIRECTED_TAG),
osip_strdup(REDIRECTED_VAL));
INFO("redirecting %s -> %s", url_string, in);
/* sent redirect message back to local client */
add_to_redirected_cache(&redirected_cache, ticket);
sip_gen_response(ticket, 302 /*Moved temporarily*/);
/* release resources and return */
osip_free(url_string);
return STS_SIP_SENT;
}
