segmentation fault once sending message with gnokii gn_sms_send - c

Question

here are the code folks :
#include <stdio.h>
#include <stdlib.h>
#include <gnokii.h>
#include <signal.h>
/*
*
*/
#define _(x) x
struct gn_statemachine *state = NULL;
void busterminate(void) {
gn_lib_phone_close(state);
gn_lib_phoneprofile_free(&state);
gn_lib_library_free();
}
void businit(void) {
gn_error error;
atexit(busterminate);
error = gn_lib_phoneprofile_load(NULL, &state);
if (GN_ERR_NONE == error) {
error = gn_lib_phone_open(state);
}
if (GN_ERR_NONE != error) {
fprintf(stderr, "%s\n", gn_error_print(error));
exit(-1);
}
}
void signal_handler(int signal) {
(void)signal;
exit(-2);
}
int main(int argc, char *argv[]) {
gn_data *data;
gn_sms sms;
gn_error error;
businit();
signal(SIGINT, signal_handler);
gn_data_clear(data);
sprintf(sms.remote.number,"%s","[phone]");
sprintf(sms.user_data[0].u.text,"%s","tesss");
data->message_center = calloc(1, sizeof(gn_sms_message_center));
data->message_center->id= 1;
error = gn_sm_functions(GN_OP_GetSMSCenter, data, state);
if(error == GN_ERR_NONE)
{
snprintf(sms.smsc.number,sizeof(sms.smsc.number),"%s",data->sms->smsc.number); // set to sms.smsc.number from data.sms.smsc.number
sms.smsc.type = data->message_center->smsc.type;
//g_slice_free(gn_sms_message_center,data->message_center); // free the ram
free(data->message_center);
}
if(!sms.smsc.number[0])
{
printf("failed once getting sms center number\n");
}
if(!sms.smsc.type)
{
sms.smsc.type = GN_GSM_NUMBER_Unknown;
}
data->sms = &sms;
//send the message
error = gn_sms_send(data,state);
if(error == GN_ERR_NONE)
{
if(sms.parts > 1)
{
int j;
printf("sms sent with : %d parts, and reference number is : ", sms.parts);
for(j=0; j < sms.parts; j++)
{
printf("%d\n",sms.reference[j]);
}
}
else
{
printf("one sms sent with reference number : %d\n",sms.reference[0]);
}
}
else
{
printf("libgnokii error : %s\n",gn_error_print(error));
}
free(sms.reference);
return 0;
}
im gonna send an sms to [phone], with the text "tesss", but unfortunately the OS said it segmentation fault, thus, where is my fault ?
$ gnokii --identify
GNOKII Version 0.6.29
IMEI : 3556XXXXX509XXX
Manufacturer : ZTE INCORPORATED
Model : MF627
Product name : MF627
Revision : BD_3GHAP673A4V1.0.0
$ gdb -q ./gnokii_send_sms
Reading symbols from /root/gnokii_send_sms...(no debugging symbols found)...done.
(gdb) r
Starting program: /root/gnokii_send_sms
[Thread debugging using libthread_db enabled]
Program received signal SIGSEGV, Segmentation fault.
0x00317334 in ?? () from /lib/libc.so.6
(gdb)

Answer 1

You're passing to gn_data_clear a pointer you haven't initialized yet. In the beginning of your main function you need to have
gn_data data;
Not
gn_data *data;
Here's the function implementation:
GNOKII_API void gn_data_clear(gn_data *data)
{
memset(data, 0, sizeof(gn_data));
}