//==========================================================================
//
//      tests/dhcp_test.c
//
//      Simple test of DHCP (ICMP) and networking support
//
//==========================================================================
// ####BSDCOPYRIGHTBEGIN####                                                
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
//
// Portions of this software may have been derived from FreeBSD, OpenBSD,   
// or other sources, and if so are covered by the appropriate copyright     
// and license included herein.                                             
//
// Portions created by the Free Software Foundation are                     
// Copyright (C) 2005 Free Software Foundation, Inc.                        
// Portions created by eCosCentric are                                      
// Copyright (C) 2005 eCosCentric Limited                                   
// -------------------------------------------                              
// ####BSDCOPYRIGHTEND####                                                  
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas
// Contributors: gthomas
// Date:         2000-01-10
// Purpose:      
// Description:  
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================

// DHCP test code

#include <network.h>

#include <pkgconf/system.h>
#include <pkgconf/net.h>

#include <dhcp.h>

#include <cyg/infra/testcase.h>

#ifdef CYGBLD_DEVS_ETH_DEVICE_H    // Get the device config if it exists
#include CYGBLD_DEVS_ETH_DEVICE_H  // May provide CYGTST_DEVS_ETH_TEST_NET_REALTIME
#endif

#ifdef CYGPKG_NET_TESTS_USE_RT_TEST_HARNESS // do we use the rt test?
# ifdef CYGTST_DEVS_ETH_TEST_NET_REALTIME // Get the test ancilla if it exists
#  include CYGTST_DEVS_ETH_TEST_NET_REALTIME
# endif
#endif

// Fill in the blanks if necessary
#ifndef TNR_OFF
# define TNR_OFF()
#endif
#ifndef TNR_ON
# define TNR_ON()
#endif
#ifndef TNR_INIT
# define TNR_INIT()
#endif
#ifndef TNR_PRINT_ACTIVITY
# define TNR_PRINT_ACTIVITY()
#endif



#define STACK_SIZE (CYGNUM_HAL_STACK_SIZE_TYPICAL + 0x1000)
static char stack[STACK_SIZE];
static cyg_thread thread_data;
static cyg_handle_t thread_handle;

#define NUM_PINGS 16
#define MAX_PACKET 4096
#define MIN_PACKET   64
#define MAX_SEND   4000

#define PACKET_ADD  ((MAX_SEND - MIN_PACKET)/NUM_PINGS)
#define nPACKET_ADD  1 

static unsigned char pkt1[MAX_PACKET], pkt2[MAX_PACKET];

#define UNIQUEID 0x1234

void
pexit(char *s)
{
    CYG_TEST_FAIL_FINISH(s);
}

// Compute INET checksum
int
inet_cksum(u_short *addr, int len)
{
    register int nleft = len;
    register u_short *w = addr;
    register u_short answer;
    register u_int sum = 0;
    u_short odd_byte = 0;

    /*
     *  Our algorithm is simple, using a 32 bit accumulator (sum),
     *  we add sequential 16 bit words to it, and at the end, fold
     *  back all the carry bits from the top 16 bits into the lower
     *  16 bits.
     */
    while( nleft > 1 )  {
        sum += *w++;
        nleft -= 2;
    }

    /* mop up an odd byte, if necessary */
    if( nleft == 1 ) {
        *(u_char *)(&odd_byte) = *(u_char *)w;
        sum += odd_byte;
    }

    /*
     * add back carry outs from top 16 bits to low 16 bits
     */
    sum = (sum >> 16) + (sum & 0x0000ffff); /* add hi 16 to low 16 */
    sum += (sum >> 16);                     /* add carry */
    answer = ~sum;                          /* truncate to 16 bits */
    return (answer);
}

static int
ticks_to_ms( cyg_uint32 ticks )
{
    int ticks_per_second = 1000000000/(CYGNUM_HAL_RTC_NUMERATOR/CYGNUM_HAL_RTC_DENOMINATOR);
    int ms = (ticks * 1000)/ticks_per_second;
    return ms;
}

static int
show_icmp(unsigned char *pkt, int len, 
          struct sockaddr_in *from, struct sockaddr_in *to)
{
    cyg_tick_count_t *tp, tv;
    struct ip *ip;
    struct icmp *icmp;
    tv = cyg_current_time();
    ip = (struct ip *)pkt;
    if ((len < sizeof(*ip)) || ip->ip_v != IPVERSION) {
        diag_printf("%s: Short packet or not IP! - Len: %d, Version: %d\n", 
                    inet_ntoa(from->sin_addr), len, ip->ip_v);
        return 0;
    }
    icmp = (struct icmp *)(pkt + sizeof(*ip));
    len -= (sizeof(*ip) + 8);
    tp = (cyg_tick_count_t *)&icmp->icmp_data;
    if (icmp->icmp_type != ICMP_ECHOREPLY) {
        diag_printf("%s: Invalid ICMP - type: %d\n", 
                    inet_ntoa(from->sin_addr), icmp->icmp_type);
        return 0;
    }
    if (icmp->icmp_id != UNIQUEID) {
        diag_printf("%s: ICMP received for wrong id - sent: %x, recvd: %x\n", 
                    inet_ntoa(from->sin_addr), UNIQUEID, icmp->icmp_id);
    }
    diag_printf("%d bytes from %s: ", len, inet_ntoa(from->sin_addr));
    diag_printf("icmp_seq=%d", icmp->icmp_seq);
    diag_printf(", time=%dms\n", ticks_to_ms(tv - *tp));
    return (from->sin_addr.s_addr == to->sin_addr.s_addr);
}

static void
ping_host(int s, struct sockaddr_in *host)
{
    struct icmp *icmp = (struct icmp *)pkt1;
    int icmp_len = MIN_PACKET;
    int seq, ok_recv, bogus_recv;
    cyg_tick_count_t *tp;
    long *dp;
    struct sockaddr_in from;
    int i, len;
    socklen_t fromlen;

    ok_recv = 0;
    bogus_recv = 0;
    diag_printf("PING server %s\n", inet_ntoa(host->sin_addr));
    for (seq = 0;  seq < NUM_PINGS;  seq++, icmp_len += PACKET_ADD ) {
        TNR_ON();
        // Build ICMP packet
        icmp->icmp_type = ICMP_ECHO;
        icmp->icmp_code = 0;
        icmp->icmp_cksum = 0;
        icmp->icmp_seq = seq;
        icmp->icmp_id = 0x1234;
        // Set up ping data
        tp = (cyg_tick_count_t *)&icmp->icmp_data;
        *tp++ = cyg_current_time();
        dp = (long *)tp;
        for (i = sizeof(*tp);  i < icmp_len;  i += sizeof(*dp)) {
            *dp++ = i;
        }
        // Add checksum
        icmp->icmp_cksum = inet_cksum( (u_short *)icmp, icmp_len+8);
        // Send it off
        if (sendto(s, icmp, icmp_len+8, 0, (struct sockaddr *)host, sizeof(*host)) < 0) {
            TNR_OFF();
            perror("sendto");
            continue;
        }
        // Wait for a response
        fromlen = sizeof(from);
        len = recvfrom(s, pkt2, sizeof(pkt2), 0, (struct sockaddr *)&from, &fromlen);
        TNR_OFF();
        if (len < 0) {
            perror("recvfrom");
            icmp_len = MIN_PACKET - PACKET_ADD; // go back to small packet size
            seq+=4;
        } else {
            if (show_icmp(pkt2, len, &from, host)) {
                ok_recv++;
            } else {
                bogus_recv++;
            }
        }
    }
    TNR_OFF();
}

static void
ping_test(struct bootp *bp)
{
    struct protoent *p;
    struct timeval tv;
    struct sockaddr_in host;
    int s;

    if ((p = getprotobyname("icmp")) == (struct protoent *)0) {
        pexit("getprotobyname");
        return;
    }
    s = socket(AF_INET, SOCK_RAW, p->p_proto);
    if (s < 0) {
        pexit("socket");
        return;
    }
    tv.tv_sec = 1;
    tv.tv_usec = 0;
    setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
    // Set up host address
    host.sin_family = AF_INET;
    host.sin_len = sizeof(host);
    host.sin_addr = bp->bp_siaddr;
    host.sin_port = 0;
    ping_host(s, &host);
    // Now try a bogus host
    host.sin_addr.s_addr = htonl(ntohl(host.sin_addr.s_addr) + 32);
    ping_host(s, &host);
    close(s);
}

void
net_test(cyg_addrword_t p)
{
#ifndef CYGPKG_NET_DHCP
    CYG_TEST_NA( "DHCP is not enabled" );
    CYG_TEST_EXIT( "DHCP is not enabled" );
#else
    int i;
    diag_printf("Start DHCP test\n");
    TNR_INIT();
    init_all_network_interfaces();

    for ( i = 10; i > 0; i-- ) {
#ifdef CYGHWR_NET_DRIVER_ETH0
        if (eth0_up) {
            ping_test(&eth0_bootp_data);
        }
#endif
        // Now do the DHCP renewal ritual...
        if ( cyg_semaphore_trywait( &dhcp_needs_attention )) {
            if ( ! dhcp_bind() ) {
                // All done
                dhcp_halt();
                CYG_TEST_FAIL_FINISH( "Rebind after lease failed");
                break;
            }
        }
#ifdef CYGHWR_NET_DRIVER_ETH1
        if (eth1_up) {
            ping_test(&eth1_bootp_data);
        }
#endif

#ifndef CYGOPT_NET_DHCP_DHCP_THREAD
        // Now do the DHCP renewal ritual...
        if ( cyg_semaphore_trywait( &dhcp_needs_attention )) {
            if ( ! dhcp_bind() ) {
                // All done
                dhcp_halt();
                CYG_TEST_FAIL_FINISH( "Rebind after lease failed");
                break;
            }
        }
#endif // not CYGOPT_NET_DHCP_DHCP_THREAD 

        if ( 1 == (i & 3) ) {
            dhcp_release();             // relinquish leases
            dhcp_halt();
            init_all_network_interfaces();
        }
    }
    dhcp_release();

    TNR_PRINT_ACTIVITY();
    CYG_TEST_PASS_FINISH("Dhcp test OK");
#endif
}

void
cyg_start(void)
{
    // Create a main thread, so we can run the scheduler and have time 'pass'
    cyg_thread_create(10,                // Priority - just a number
                      net_test,          // entry
                      0,                 // entry parameter
                      "Network test",    // Name
                      &stack[0],         // Stack
                      STACK_SIZE,        // Size
                      &thread_handle,    // Handle
                      &thread_data       // Thread data structure
            );
    cyg_thread_resume(thread_handle);  // Start it
    cyg_scheduler_start();
}
