session.c

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#include <time.h>
#include <stdio.h>
#include <stdlib.h>

#include "session.h"
#include "diameter.h"
#include "config.h"

extern dp_config *config;       
gen_lock_t *session_lock;       
unsigned int *session_id1;      
unsigned int *session_id2;      
int session_init()
{
    session_lock = lock_alloc();
    if (!session_lock){
        LOG_NO_MEM("lock",sizeof(gen_lock_t));
        goto error;
    }
    session_lock = lock_init(session_lock);
    session_id1 = shm_malloc(sizeof(unsigned int));
    if (!session_id1){
        LOG_NO_MEM("shm",sizeof(unsigned int));
        goto error;
    }
    session_id2 = shm_malloc(sizeof(unsigned int));
    if (!session_id2){
        LOG_NO_MEM("shm",sizeof(unsigned int));
        goto error;
    }
    srand((unsigned int)time(0));   
    *session_id1 = rand();
    *session_id1 <<= 16;
    *session_id1 += time(0)&0xFFFF;
    *session_id2 = 0;
    return 1;
error:
    return 0;
}

int session_destroy()
{
    lock_get(session_lock);
    lock_destroy(session_lock);
    lock_dealloc((void*)session_lock);  
    shm_free(session_id1);
    shm_free(session_id2);
    return 1;
}


/*
 * Generates a new session_ID (conforming with draft-ietf-aaa-diameter-17).
 * This function is thread safe.
 * @returns an 1 if success or -1 if error.
 */
static int generate_sessionID( str *sID, unsigned int end_pad_len)
{
    unsigned int s2;

    /* some checks */
    if (!sID)
        goto error;

    /* compute id's len */
    sID->len = config->identity.len +
        1/*;*/ + 10/*high 32 bits*/ +
        1/*;*/ + 10/*low 32 bits*/ +
//      1/*;*/ + 8/*optional value*/ +
        1 /* terminating \0 */ +
        end_pad_len;

    /* get some memory for it */
    sID->s = (char*)shm_malloc( sID->len );
    if (sID->s==0) {
        LOG(L_ERR,"ERROR:generate_sessionID: no more free memory!\n");
        goto error;
    }

    lock_get(session_lock);
    s2 = *session_id2 +1;
    *session_id2 = s2;
    lock_release(session_lock);
    
    /* build the sessionID */
    sprintf(sID->s,"%.*s;%u;%u",config->identity.len,config->identity.s,*session_id1,s2);
    sID->len = strlen(sID->s);
    return 1;
error:
    return -1;
}






/****************************** API FUNCTIONS ********************************/

AAASessionId AAACreateSession()
{
    AAASessionId sID={0,0};
    
    /* generates a new session-ID - the extra pad is used to append to 
     * session-ID the hash-code and label of the session ".XXXXXXXX.XXXXXXXX"*/
    if (generate_sessionID( &(sID), 0 )!=1)
        goto error;

    return sID;
error:
    LOG(L_ERR,"ERROR:AAACreateSession(): Error on new session generation\n");
    return sID;
}

int AAADropSession(AAASessionId *s)
{
    if (s->s) shm_free(s->s);
    s->s =0;
    s->len=0;
    return AAA_ERR_SUCCESS;
}

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