/
call_control.c
1233 lines (1010 loc) · 33.5 KB
/
call_control.c
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/*
* Copyright (C) 2005-2019 Dan Pascu
*
* This file is part of OpenSIPS, a free SIP server.
*
* OpenSIPS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* For a license to use the OpenSIPS software under conditions
* other than those described here, or to purchase support for this
* software, please contact iptel.org by e-mail at the following addresses:
* info@iptel.org
*
* OpenSIPS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include <errno.h>
#include <assert.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/un.h>
#include "../../sr_module.h"
#include "../../mem/mem.h"
#include "../../dprint.h"
#include "../../str.h"
#include "../../pvar.h"
#include "../../ut.h"
#include "../../trim.h"
#include "../../script_cb.h"
#include "../../parser/digest/digest.h"
#include "../../parser/parse_from.h"
#include "../dialog/dlg_load.h"
#include "../dialog/dlg_hash.h"
#include "../tm/tm_load.h"
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
# define INLINE inline
#else
# define INLINE
#endif
#define CANONICAL_URI_AVP_SPEC "$avp(cc_can_uri)"
#define SIGNALING_IP_AVP_SPEC "$avp(cc_signaling_ip)"
#define DIVERTER_AVP_SPEC "$avp(cc_diverter)"
#define CALL_LIMIT_AVP_SPEC "$avp(cc_call_limit)"
#define CALL_TOKEN_AVP_SPEC "$avp(cc_call_token)"
// Although `AF_LOCAL' is mandated by POSIX.1g, `AF_UNIX' is portable to
// more systems. `AF_UNIX' was the traditional name stemming from BSD, so
// even most POSIX systems support it. It is also the name of choice in
// the Unix98 specification. So if there's no AF_LOCAL fallback to AF_UNIX
#ifndef AF_LOCAL
# define AF_LOCAL AF_UNIX
#endif
// Solaris does not have the MSG_NOSIGNAL flag for the send(2) syscall
#ifndef MSG_NOSIGNAL
# define MSG_NOSIGNAL 0
#endif
typedef int Bool;
#define True 1
#define False 0
typedef struct AVP_Param {
str spec;
int name;
unsigned short type;
} AVP_Param;
typedef struct AVP_List {
str name;
pv_spec_p spec;
struct AVP_List *next;
} AVP_List;
#define RETRY_INTERVAL 10
#define BUFFER_SIZE 8192
typedef struct CallControlSocket {
char *name; // name
int sock; // socket
int timeout; // how many milliseconds to wait for an answer
time_t last_failure; // time of the last failure
char data[BUFFER_SIZE]; // buffer for the answer data
} CallControlSocket;
// Function prototypes
static int CallControl(struct sip_msg *msg, char *str1, char *str2);
static int mod_init(void);
static int child_init(int rank);
static void destroy(void);
int parse_init(unsigned int type, void *val);
int parse_start(unsigned int type, void *val);
int parse_stop(unsigned int type, void *val);
// Local global variables
static CallControlSocket callcontrol_socket = {
"/var/run/callcontrol/socket", // name
-1, // sock
500, // timeout in 500 milliseconds if there is no answer
0, // time of the last failure
"" // data
};
static int disable = False;
// The AVP where the diverter URI is stored (if defined)
static AVP_Param diverter_avp = {str_init(DIVERTER_AVP_SPEC), -1, 0};
// The AVP where the canonical URI is stored (if defined)
static AVP_Param canonical_uri_avp = {str_init(CANONICAL_URI_AVP_SPEC), -1, 0};
// The AVP where the caller signaling IP is stored (if defined)
static AVP_Param signaling_ip_avp = {str_init(SIGNALING_IP_AVP_SPEC), -1, 0};
// The AVP where the call limit is stored (if defined)
static AVP_Param call_limit_avp = {str_init(CALL_LIMIT_AVP_SPEC), -1, 0};
// The AVP where the call token is stored (if defined)
static AVP_Param call_token_avp = {str_init(CALL_TOKEN_AVP_SPEC), -1, 0};
struct dlg_binds dlg_api;
static int prepaid_account_flag = -1;
static char *prepaid_account_str = 0;
AVP_List *init_avps = NULL, *start_avps = NULL, *stop_avps = NULL;
pv_elem_t *model;
static cmd_export_t commands[] = {
{"call_control", (cmd_function)CallControl, {{0, 0, 0}}, REQUEST_ROUTE},
{0, 0, {{0, 0, 0}}, 0}
};
static param_export_t parameters[] = {
{"init", STR_PARAM|USE_FUNC_PARAM, (void*)parse_init},
{"start", STR_PARAM|USE_FUNC_PARAM, (void*)parse_start},
{"stop", STR_PARAM|USE_FUNC_PARAM, (void*)parse_stop},
{"disable", INT_PARAM, &disable},
{"socket_name", STR_PARAM, &(callcontrol_socket.name)},
{"socket_timeout", INT_PARAM, &(callcontrol_socket.timeout)},
{"diverter_avp", STR_PARAM, &(diverter_avp.spec.s)},
{"canonical_uri_avp", STR_PARAM, &(canonical_uri_avp.spec.s)},
{"signaling_ip_avp", STR_PARAM, &(signaling_ip_avp.spec.s)},
{"call_limit_avp", STR_PARAM, &(call_limit_avp.spec.s)},
{"call_token_avp", STR_PARAM, &(call_token_avp.spec.s)},
{"prepaid_account_flag", STR_PARAM, &prepaid_account_str},
{0, 0, 0}
};
static dep_export_t deps = {
// OpenSIPS module dependencies
{
{MOD_TYPE_DEFAULT, "dialog", DEP_ABORT},
{MOD_TYPE_NULL, NULL, 0}
},
// modparam dependencies
{
{NULL, NULL}
}
};
struct module_exports exports = {
"call_control", // module name
MOD_TYPE_DEFAULT, // class of this module
MODULE_VERSION, // module version
DEFAULT_DLFLAGS, // dlopen flags
NULL, // load function
&deps, // OpenSIPS module dependencies
0, // OpenSIPS dependencies function
commands, // exported functions
NULL, // exported async functions
parameters, // exported parameters
NULL, // exported statistics
NULL, // exported MI functions
NULL, // exported pseudo-variables
NULL, // exported transformations
NULL, // extra processes
mod_init, // module init function (before fork. kids will inherit)
NULL, // reply processing function
destroy, // destroy function
child_init, // child init function
NULL // reload confirm function
};
typedef enum CallControlAction {
CAInitialize = 1,
CAStart,
CAStop
} CallControlAction;
typedef struct CallInfo {
CallControlAction action;
unsigned long long dialog_id;
str ruri;
str diverter;
str source_ip;
str callid;
str from;
str from_tag;
str call_token;
char* prepaid_account;
int call_limit;
} CallInfo;
void
destroy_list(AVP_List *avp_list)
{
AVP_List *avp, *next;
avp = avp_list;
while (avp) {
next = avp->next;
pkg_free(avp);
avp = next;
}
}
int
parse_param(char *value, AVP_List **avp_list)
{
char *ptr;
str buffer;
AVP_List *avp = NULL;
ptr = value;
while (*ptr) {
avp = pkg_malloc(sizeof(AVP_List));
if (!avp) {
LM_ERR("out of private memory\n");
return -1;
}
avp->next = *avp_list;
avp->spec = pkg_malloc(sizeof(pv_spec_t));
if (!avp->spec) {
LM_ERR("out of private memory\n");
pkg_free(avp);
return -1;
}
while (isspace(*ptr)) ptr++;
if (*ptr == '\0') {
LM_ERR("malformed modparam\n");
pkg_free(avp->spec);
pkg_free(avp);
return -1;
}
avp->name.s = ptr;
while (isgraph(*ptr) && *ptr != '=') ptr++;
if (*ptr == '\0') {
LM_ERR("malformed modparam\n");
pkg_free(avp->spec);
pkg_free(avp);
return -1;
}
avp->name.len = ptr - avp->name.s;
while (isspace(*ptr)) ptr++;
if (*ptr != '=') {
LM_ERR("malformed modparam\n");
pkg_free(avp->spec);
pkg_free(avp);
return -1;
}
ptr++;
while (isspace(*ptr)) ptr++;
buffer.s = ptr;
buffer.len = strlen(ptr);
ptr = pv_parse_spec(&buffer, avp->spec);
if (ptr == NULL) {
LM_ERR("malformed modparam\n");
pkg_free(avp->spec);
pkg_free(avp);
return -1;
}
*avp_list = avp;
}
return 0;
}
int
parse_init(unsigned int type, void *value)
{
if (parse_param(value, &init_avps) == -1)
return E_CFG;
return 0;
}
int
parse_start(unsigned int type, void *value)
{
if (parse_param(value, &start_avps) == -1)
return E_CFG;
return 0;
}
int
parse_stop(unsigned int type, void *value)
{
if (parse_param(value, &stop_avps) == -1)
return E_CFG;
return 0;
}
// Message checking and parsing
//
static Bool
has_to_tag(struct sip_msg *msg)
{
str tag;
if (!msg->to) {
if (parse_headers(msg, HDR_TO_F, 0)==-1) {
LM_ERR("cannot parse 'To' header\n");
return False;
}
if (!msg->to) {
LM_ERR("missing 'To' header\n");
return False;
}
}
tag = get_to(msg)->tag_value;
if (tag.s==NULL || tag.len==0) {
return False;
}
return True;
}
// Get canonical request URI
static str
get_canonical_request_uri(struct sip_msg* msg)
{
int_str value;
if (!search_first_avp(canonical_uri_avp.type | AVP_VAL_STR,
canonical_uri_avp.name, &value, NULL) ||
value.s.s==NULL || value.s.len==0) {
return *GET_RURI(msg);
}
return value.s;
}
// Get caller signaling IP
static str
get_signaling_ip(struct sip_msg* msg)
{
int_str value;
if (!search_first_avp(signaling_ip_avp.type | AVP_VAL_STR,
signaling_ip_avp.name, &value, NULL) ||
!value.s.s || value.s.len==0) {
value.s.s = ip_addr2a(&msg->rcv.src_ip);
value.s.len = strlen(value.s.s);
}
return value.s;
}
static str
get_diverter(struct sip_msg *msg)
{
struct hdr_field *header;
dig_cred_t *credentials;
int_str avpvalue;
static str diverter;
diverter.s = "None";
diverter.len = 4;
if (search_first_avp(diverter_avp.type|AVP_VAL_STR, diverter_avp.name, &avpvalue, NULL)) {
// have a diverted call
diverter = avpvalue.s;
} else {
get_authorized_cred(msg->proxy_auth, &header);
if (header) {
credentials = &((auth_body_t*)(header->parsed))->digest;
} else {
if (parse_headers(msg, HDR_PROXYAUTH_F, 0) == -1) {
LM_ERR("cannot parse Proxy-Authorization header\n");
return diverter;
}
if (!msg->proxy_auth)
return diverter;
if (parse_credentials(msg->proxy_auth) != 0) {
LM_ERR("cannot parse credentials\n");
return diverter;
}
credentials = &((auth_body_t*)(msg->proxy_auth->parsed))->digest;
}
if (credentials->username.user.len > 0 &&
credentials->username.domain.len > 0 &&
credentials->realm.len == 0 &&
credentials->nonce.len == 0 &&
credentials->response.len == 0) {
// this is a call diverted from the failure route
// and sent back to proxy with append_pa_hf()
diverter = credentials->username.whole;
}
}
return diverter;
}
static int
get_call_limit(struct sip_msg* msg)
{
int_str value;
struct usr_avp *avp;
avp = search_first_avp(call_limit_avp.type, call_limit_avp.name, &value, NULL);
if (!avp)
return 0;
if (avp->flags & AVP_VAL_STR) {
return atoi(value.s.s);
} else {
return value.n;
}
}
static str
get_call_token(struct sip_msg* msg)
{
int_str value;
struct usr_avp *avp;
static str call_token;
call_token.s = "None";
call_token.len = 4;
avp = search_first_avp(call_token_avp.type, call_token_avp.name, &value, NULL);
if (avp) {
if (avp->flags & AVP_VAL_STR) {
call_token = value.s;
} else {
call_token.s = int2str(value.n, &call_token.len);
}
}
return call_token;
}
static CallInfo*
get_call_info(struct sip_msg *msg, CallControlAction action)
{
static CallInfo call_info;
int headers;
memset(&call_info, 0, sizeof(struct CallInfo));
switch (action) {
case CAInitialize:
headers = HDR_CALLID_F|HDR_FROM_F;
break;
case CAStart:
case CAStop:
headers = HDR_CALLID_F;
break;
default:
// Invalid action. Should never get here.
assert(False);
return NULL;
}
if (parse_headers(msg, headers, 0) == -1) {
LM_ERR("cannot parse required headers\n");
return NULL;
}
if (headers & HDR_CALLID_F) {
if (msg->callid == NULL) {
LM_ERR("missing Call-ID header\n");
return NULL;
}
call_info.callid = msg->callid->body;
trim(&call_info.callid);
}
if (headers & HDR_FROM_F) {
struct to_body *from; // yeah. suggestive structure name ;)
if (msg->from == NULL) {
LM_ERR("missing From header\n");
return NULL;
}
if (!msg->from->parsed && parse_from_header(msg)==-1) {
LM_ERR("cannot parse From header\n");
return NULL;
}
from = get_from(msg);
if (from->body.s==NULL || from->body.len==0) {
LM_ERR("missing From\n");
return NULL;
}
if (from->tag_value.s==NULL || from->tag_value.len==0) {
LM_ERR("missing From tag\n");
return NULL;
}
call_info.from = from->body;
call_info.from_tag = from->tag_value;
}
if (action == CAInitialize) {
call_info.ruri = get_canonical_request_uri(msg);
call_info.diverter = get_diverter(msg);
call_info.source_ip = get_signaling_ip(msg);
call_info.call_limit = get_call_limit(msg);
call_info.call_token = get_call_token(msg);
if (prepaid_account_flag >= 0) {
call_info.prepaid_account = isflagset(msg, prepaid_account_flag)==1 ? "true" : "false";
} else {
call_info.prepaid_account = "unknown";
}
}
call_info.action = action;
return &call_info;
}
static char*
make_request(CallInfo *call)
{
static char request[8192];
int len;
switch (call->action) {
case CAInitialize:
len = snprintf(request, sizeof(request),
"init\r\n"
"ruri: %.*s\r\n"
"diverter: %.*s\r\n"
"sourceip: %.*s\r\n"
"callid: %.*s\r\n"
"from: %.*s\r\n"
"fromtag: %.*s\r\n"
"prepaid: %s\r\n"
"call_limit: %d\r\n"
"call_token: %.*s\r\n"
"\r\n",
call->ruri.len, call->ruri.s,
call->diverter.len, call->diverter.s,
call->source_ip.len, call->source_ip.s,
call->callid.len, call->callid.s,
call->from.len, call->from.s,
call->from_tag.len, call->from_tag.s,
call->prepaid_account,
call->call_limit,
call->call_token.len, call->call_token.s);
if (len >= sizeof(request)) {
LM_ERR("callcontrol request is longer than %zu bytes\n", sizeof(request));
return NULL;
}
break;
case CAStart:
len = snprintf(request, sizeof(request),
"start\r\n"
"callid: %.*s\r\n"
"dialogid: %llu\r\n"
"\r\n",
call->callid.len, call->callid.s, call->dialog_id);
if (len >= sizeof(request)) {
LM_ERR("callcontrol request is longer than %zu bytes\n", sizeof(request));
return NULL;
}
break;
case CAStop:
len = snprintf(request, sizeof(request),
"stop\r\n"
"callid: %.*s\r\n"
"\r\n",
call->callid.len, call->callid.s);
if (len >= sizeof(request)) {
LM_ERR("callcontrol request is longer than %zu bytes\n", sizeof(request));
return NULL;
}
break;
default:
// should never get here, but keep gcc from complaining
assert(False);
return NULL;
}
return request;
}
static char*
make_custom_request(struct sip_msg *msg, CallInfo *call)
{
static char request[8192];
AVP_List *avp_list, *avp;
pv_value_t avp_value;
int len = 0;
switch (call->action) {
case CAInitialize:
avp_list = init_avps;
break;
case CAStart:
avp_list = start_avps;
break;
case CAStop:
avp_list = stop_avps;
break;
default:
// should never get here, but keep gcc from complaining
assert(False);
return NULL;
}
for (avp=avp_list; avp; avp=avp->next) {
if (pv_get_spec_value(msg, avp->spec, &avp_value) < 0) {
LM_ERR("cannot get the spec's value!\n");
return NULL;
}
if (avp_value.flags & PV_VAL_INT) {
len += snprintf(request + len, sizeof(request) - len - 1,
"%.*s = %d ", avp->name.len, avp->name.s, avp_value.ri);
} else if (avp_value.flags & PV_VAL_STR) {
len += snprintf(request + len, sizeof(request) - len - 1,
"%.*s = %.*s ", avp->name.len, avp->name.s, avp_value.rs.len, avp_value.rs.s);
}
if (len >= sizeof(request)) {
LM_ERR("callcontrol request is longer than %zu bytes\n", sizeof(request));
return NULL;
}
}
return request;
}
// Functions dealing with the external call_control helper
//
static Bool
callcontrol_connect(void)
{
struct sockaddr_un addr;
if (callcontrol_socket.sock >= 0)
return True;
if (callcontrol_socket.last_failure + RETRY_INTERVAL > time(NULL))
return False;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_LOCAL;
strncpy(addr.sun_path, callcontrol_socket.name, sizeof(addr.sun_path) - 1);
#ifdef HAVE_SOCKADDR_SA_LEN
addr.sun_len = strlen(addr.sun_path);
#endif
callcontrol_socket.sock = socket(AF_LOCAL, SOCK_STREAM, 0);
if (callcontrol_socket.sock < 0) {
LM_ERR("can't create socket\n");
callcontrol_socket.last_failure = time(NULL);
return False;
}
if (connect(callcontrol_socket.sock, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
LM_ERR("failed to connect to %s: %s\n", callcontrol_socket.name, strerror(errno));
close(callcontrol_socket.sock);
callcontrol_socket.sock = -1;
callcontrol_socket.last_failure = time(NULL);
return False;
}
return True;
}
static void
callcontrol_disconnect(void)
{
if (callcontrol_socket.sock < 0)
return;
close(callcontrol_socket.sock);
callcontrol_socket.sock = -1;
callcontrol_socket.last_failure = time(NULL);
}
static char*
send_command(char *command)
{
int cmd_len, bytes, tries, sent, received, count;
struct timeval timeout;
fd_set rset;
if (!callcontrol_connect())
return NULL;
cmd_len = strlen(command);
for (sent=0, tries=0; sent<cmd_len && tries<3; tries++, sent+=bytes) {
do
bytes = send(callcontrol_socket.sock, command+sent, cmd_len-sent, MSG_DONTWAIT|MSG_NOSIGNAL);
while (bytes == -1 && errno == EINTR);
if (bytes == -1) {
switch (errno) {
case ECONNRESET:
case EPIPE:
callcontrol_disconnect();
callcontrol_socket.last_failure = 0; // we want to reconnect immediately
if (callcontrol_connect()) {
sent = bytes = 0;
continue;
} else {
LM_ERR("connection with callcontrol did die\n");
}
break;
case EACCES:
LM_ERR("permission denied sending to %s\n", callcontrol_socket.name);
break;
case EWOULDBLOCK:
// this shouldn't happen as we read back all the answer after a request.
// if it would block, it means there is an error.
LM_ERR("sending command would block!\n");
break;
default:
LM_ERR("%d: %s\n", errno, strerror(errno));
break;
}
callcontrol_disconnect();
return NULL;
}
}
if (sent < cmd_len) {
LM_ERR("couldn't send complete command after 3 tries\n");
callcontrol_disconnect();
return NULL;
}
callcontrol_socket.data[0] = 0;
received = 0;
while (True) {
FD_ZERO(&rset);
FD_SET(callcontrol_socket.sock, &rset);
timeout.tv_sec = callcontrol_socket.timeout / 1000;
timeout.tv_usec = (callcontrol_socket.timeout % 1000) * 1000;
do
count = select(callcontrol_socket.sock + 1, &rset, NULL, NULL, &timeout);
while (count == -1 && errno == EINTR);
if (count == -1) {
LM_ERR("select failed: %d: %s\n", errno, strerror(errno));
callcontrol_disconnect();
return NULL;
} else if (count == 0) {
LM_ERR("did timeout waiting for an answer\n");
callcontrol_disconnect();
return NULL;
} else {
do
bytes = recv(callcontrol_socket.sock, callcontrol_socket.data+received, BUFFER_SIZE-1-received, 0);
while (bytes == -1 && errno == EINTR);
if (bytes == -1) {
LM_ERR("failed to read answer: %d: %s\n", errno, strerror(errno));
callcontrol_disconnect();
return NULL;
} else if (bytes == 0) {
LM_ERR("connection with callcontrol closed\n");
callcontrol_disconnect();
return NULL;
} else {
callcontrol_socket.data[received+bytes] = 0;
if (strstr(callcontrol_socket.data+received, "\r\n")!=NULL) {
break;
}
received += bytes;
}
}
}
return callcontrol_socket.data;
}
// Call control processing
//
// Return codes:
// 2 - No limit
// 1 - Limited
// -1 - No credit
// -2 - Locked
// -3 - Duplicated callid
// -4 - Call limit reached
// -5 - Internal error (message parsing, communication, ...)
static int
call_control_initialize(struct sip_msg *msg)
{
CallInfo *call;
char *message, *result = NULL;
call = get_call_info(msg, CAInitialize);
if (!call) {
LM_ERR("can't retrieve call info\n");
return -5;
}
if (!init_avps)
message = make_request(call);
else
message = make_custom_request(msg, call);
if (!message)
return -5;
result = send_command(message);
if (result==NULL) {
return -5;
} else if (strcasecmp(result, "No limit\r\n")==0) {
return 2;
} else if (strcasecmp(result, "Limited\r\n")==0) {
return 1;
} else if (strcasecmp(result, "No credit\r\n")==0) {
return -1;
} else if (strcasecmp(result, "Locked\r\n")==0) {
return -2;
} else if (strcasecmp(result, "Duplicated callid\r\n")==0) {
return -3;
} else if (strcasecmp(result, "Call limit reached\r\n")==0) {
return -4;
} else {
return -5;
}
}
// Called during a dialog for start and update requests
//
// Return codes:
// 1 - Ok
// -1 - Session not found
// -5 - Internal error (message parsing, communication, ...)
static int
call_control_start(struct sip_msg *msg, struct dlg_cell *dlg)
{
CallInfo *call;
char *message, *result;
call = get_call_info(msg, CAStart);
if (!call) {
LM_ERR("can't retrieve call info\n");
return -5;
}
call->dialog_id = (unsigned long long) dlg->h_entry << 32 | dlg->h_id;
if (!start_avps)
message = make_request(call);
else
message = make_custom_request(msg, call);
if (!message)
return -5;
result = send_command(message);
if (result==NULL) {
return -5;
} else if (strcasecmp(result, "Ok\r\n")==0) {
return 1;
} else if (strcasecmp(result, "Not found\r\n")==0) {
return -1;
} else {
return -5;
}
}
// Called during a dialog ending to stop callcontrol
//
// Return codes:
// 1 - Ok
// -1 - Session not found
// -5 - Internal error (message parsing, communication, ...)
static int
call_control_stop(struct sip_msg *msg, str callid)
{
CallInfo call;
char *message, *result;
call.action = CAStop;
call.callid = callid;
if (!stop_avps)
message = make_request(&call);
else
message = make_custom_request(msg, &call);
if (!message)
return -5;
result = send_command(message);
if (result==NULL) {
return -5;
} else if (strcasecmp(result, "Ok\r\n")==0) {
return 1;
} else if (strcasecmp(result, "Not found\r\n")==0) {
return -1;
} else {
return -5;
}
}
// Dialog callbacks and helpers
//