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pcap-dos.c
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pcap-dos.c
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/*
* This file is part of DOS-libpcap
* Ported to DOS/DOSX by G. Vanem <[email protected]>
*
* pcap-dos.c: Interface to PKTDRVR, NDIS2 and 32-bit pmode
* network drivers.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <float.h>
#include <fcntl.h>
#include <limits.h> /* for INT_MAX */
#include <io.h>
#if defined(USE_32BIT_DRIVERS)
#include "msdos/pm_drvr/pmdrvr.h"
#include "msdos/pm_drvr/pci.h"
#include "msdos/pm_drvr/bios32.h"
#include "msdos/pm_drvr/module.h"
#include "msdos/pm_drvr/3c501.h"
#include "msdos/pm_drvr/3c503.h"
#include "msdos/pm_drvr/3c509.h"
#include "msdos/pm_drvr/3c59x.h"
#include "msdos/pm_drvr/3c515.h"
#include "msdos/pm_drvr/3c90x.h"
#include "msdos/pm_drvr/3c575_cb.h"
#include "msdos/pm_drvr/ne.h"
#include "msdos/pm_drvr/wd.h"
#include "msdos/pm_drvr/accton.h"
#include "msdos/pm_drvr/cs89x0.h"
#include "msdos/pm_drvr/rtl8139.h"
#include "msdos/pm_drvr/ne2k-pci.h"
#endif
#include "pcap.h"
#include "pcap-dos.h"
#include "pcap-int.h"
#include "msdos/pktdrvr.h"
#ifdef USE_NDIS2
#include "msdos/ndis2.h"
#endif
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_ether.h>
#include <net/if_packe.h>
#include <tcp.h>
#if defined(USE_32BIT_DRIVERS)
#define FLUSHK() do { _printk_safe = 1; _printk_flush(); } while (0)
#define NDIS_NEXT_DEV &rtl8139_dev
static char *rx_pool = NULL;
static void init_32bit (void);
static int pktq_init (struct rx_ringbuf *q, int size, int num, char *pool);
static int pktq_check (struct rx_ringbuf *q);
static int pktq_inc_out (struct rx_ringbuf *q);
static int pktq_in_index (struct rx_ringbuf *q) LOCKED_FUNC;
static void pktq_clear (struct rx_ringbuf *q) LOCKED_FUNC;
static struct rx_elem *pktq_in_elem (struct rx_ringbuf *q) LOCKED_FUNC;
static struct rx_elem *pktq_out_elem (struct rx_ringbuf *q);
#else
#define FLUSHK() ((void)0)
#define NDIS_NEXT_DEV NULL
#endif
/*
* Internal variables/functions in Watt-32
*/
extern WORD _pktdevclass;
extern BOOL _eth_is_init;
extern int _w32_dynamic_host;
extern int _watt_do_exit;
extern int _watt_is_init;
extern int _w32__bootp_on, _w32__dhcp_on, _w32__rarp_on, _w32__do_mask_req;
extern void (*_w32_usr_post_init) (void);
extern void (*_w32_print_hook)();
extern void dbug_write (const char *); /* Watt-32 lib, pcdbug.c */
extern int pkt_get_mtu (void);
static int ref_count = 0;
static u_long mac_count = 0;
static u_long filter_count = 0;
static volatile BOOL exc_occured = 0;
static struct device *handle_to_device [20];
static int pcap_activate_dos (pcap_t *p);
static int pcap_read_dos (pcap_t *p, int cnt, pcap_handler callback,
u_char *data);
static void pcap_cleanup_dos (pcap_t *p);
static int pcap_stats_dos (pcap_t *p, struct pcap_stat *ps);
static int pcap_sendpacket_dos (pcap_t *p, const void *buf, size_t len);
static int pcap_setfilter_dos (pcap_t *p, struct bpf_program *fp);
static int ndis_probe (struct device *dev);
static int pkt_probe (struct device *dev);
static void close_driver (void);
static int init_watt32 (struct pcap *pcap, const char *dev_name, char *err_buf);
static int first_init (const char *name, char *ebuf, int promisc);
static void watt32_recv_hook (u_char *dummy, const struct pcap_pkthdr *pcap,
const u_char *buf);
/*
* These are the device we always support
*/
static struct device ndis_dev = {
"ndis",
"NDIS2 LanManager",
0,
0,0,0,0,0,0,
NDIS_NEXT_DEV, /* NULL or a 32-bit device */
ndis_probe
};
static struct device pkt_dev = {
"pkt",
"Packet-Driver",
0,
0,0,0,0,0,0,
&ndis_dev,
pkt_probe
};
static struct device *get_device (int fd)
{
if (fd <= 0 || fd >= sizeof(handle_to_device)/sizeof(handle_to_device[0]))
return (NULL);
return handle_to_device [fd-1];
}
/*
* Private data for capturing on MS-DOS.
*/
struct pcap_dos {
void (*wait_proc)(void); /* call proc while waiting */
struct pcap_stat stat;
};
pcap_t *pcap_create_interface (const char *device _U_, char *ebuf)
{
pcap_t *p;
p = PCAP_CREATE_COMMON(ebuf, struct pcap_dos);
if (p == NULL)
return (NULL);
p->activate_op = pcap_activate_dos;
return (p);
}
/*
* Open MAC-driver with name 'device_name' for live capture of
* network packets.
*/
static int pcap_activate_dos (pcap_t *pcap)
{
if (pcap->opt.rfmon) {
/*
* No monitor mode on DOS.
*/
return (PCAP_ERROR_RFMON_NOTSUP);
}
/*
* Turn a negative snapshot value (invalid), a snapshot value of
* 0 (unspecified), or a value bigger than the normal maximum
* value, into the maximum allowed value.
*
* If some application really *needs* a bigger snapshot
* length, we should just increase MAXIMUM_SNAPLEN.
*/
if (pcap->snapshot <= 0 || pcap->snapshot > MAXIMUM_SNAPLEN)
pcap->snapshot = MAXIMUM_SNAPLEN;
if (pcap->snapshot < ETH_MIN+8)
pcap->snapshot = ETH_MIN+8;
if (pcap->snapshot > ETH_MAX) /* silently accept and truncate large MTUs */
pcap->snapshot = ETH_MAX;
pcap->linktype = DLT_EN10MB; /* !! */
pcap->cleanup_op = pcap_cleanup_dos;
pcap->read_op = pcap_read_dos;
pcap->stats_op = pcap_stats_dos;
pcap->inject_op = pcap_sendpacket_dos;
pcap->setfilter_op = pcap_setfilter_dos;
pcap->setdirection_op = NULL; /* Not implemented.*/
pcap->fd = ++ref_count;
pcap->bufsize = ETH_MAX+100; /* add some margin */
pcap->buffer = calloc (pcap->bufsize, 1);
if (pcap->fd == 1) /* first time we're called */
{
if (!init_watt32(pcap, pcap->opt.device, pcap->errbuf) ||
!first_init(pcap->opt.device, pcap->errbuf, pcap->opt.promisc))
{
/* XXX - free pcap->buffer? */
return (PCAP_ERROR);
}
atexit (close_driver);
}
else if (stricmp(active_dev->name,pcap->opt.device))
{
snprintf (pcap->errbuf, PCAP_ERRBUF_SIZE,
"Cannot use different devices simultaneously "
"(`%s' vs. `%s')", active_dev->name, pcap->opt.device);
/* XXX - free pcap->buffer? */
return (PCAP_ERROR);
}
handle_to_device [pcap->fd-1] = active_dev;
return (0);
}
/*
* Poll the receiver queue and call the pcap callback-handler
* with the packet.
*/
static int
pcap_read_one (pcap_t *p, pcap_handler callback, u_char *data)
{
struct pcap_dos *pd = p->priv;
struct pcap_pkthdr pcap;
struct timeval now, expiry = { 0,0 };
int rx_len = 0;
if (p->opt.timeout > 0)
{
gettimeofday2 (&now, NULL);
expiry.tv_usec = now.tv_usec + 1000UL * p->opt.timeout;
expiry.tv_sec = now.tv_sec;
while (expiry.tv_usec >= 1000000L)
{
expiry.tv_usec -= 1000000L;
expiry.tv_sec++;
}
}
while (!exc_occured)
{
volatile struct device *dev; /* might be reset by sig_handler */
dev = get_device (p->fd);
if (!dev)
break;
PCAP_ASSERT (dev->copy_rx_buf || dev->peek_rx_buf);
FLUSHK();
/* If driver has a zero-copy receive facility, peek at the queue,
* filter it, do the callback and release the buffer.
*/
if (dev->peek_rx_buf)
{
PCAP_ASSERT (dev->release_rx_buf);
rx_len = (*dev->peek_rx_buf) (&p->buffer);
}
else
{
rx_len = (*dev->copy_rx_buf) (p->buffer, p->snapshot);
}
if (rx_len > 0) /* got a packet */
{
mac_count++;
FLUSHK();
pcap.caplen = min (rx_len, p->snapshot);
pcap.len = rx_len;
if (callback &&
(!p->fcode.bf_insns || pcap_filter(p->fcode.bf_insns, p->buffer, pcap.len, pcap.caplen)))
{
filter_count++;
/* Fix-me!! Should be time of arrival. Not time of
* capture.
*/
gettimeofday2 (&pcap.ts, NULL);
(*callback) (data, &pcap, p->buffer);
}
if (dev->release_rx_buf)
(*dev->release_rx_buf) (p->buffer);
if (pcap_pkt_debug > 0)
{
if (callback == watt32_recv_hook)
dbug_write ("pcap_recv_hook\n");
else dbug_write ("pcap_read_op\n");
}
FLUSHK();
return (1);
}
/* Has "pcap_breakloop()" been called?
*/
if (p->break_loop) {
/*
* Yes - clear the flag that indicates that it
* has, and return -2 to indicate that we were
* told to break out of the loop.
*/
p->break_loop = 0;
return (-2);
}
/* If not to wait for a packet or pcap_cleanup_dos() called from
* e.g. SIGINT handler, exit loop now.
*/
if (p->opt.timeout <= 0 || (volatile int)p->fd <= 0)
break;
gettimeofday2 (&now, NULL);
if (timercmp(&now, &expiry, >))
break;
#ifndef DJGPP
kbhit(); /* a real CPU hog */
#endif
if (pd->wait_proc)
(*pd->wait_proc)(); /* call yield func */
}
if (rx_len < 0) /* receive error */
{
pd->stat.ps_drop++;
#ifdef USE_32BIT_DRIVERS
if (pcap_pkt_debug > 1)
printk ("pkt-err %s\n", pktInfo.error);
#endif
return (-1);
}
return (0);
}
static int
pcap_read_dos (pcap_t *p, int cnt, pcap_handler callback, u_char *data)
{
int rc, num = 0;
/*
* This can conceivably process more than INT_MAX packets,
* which would overflow the packet count, causing it either
* to look like a negative number, and thus cause us to
* return a value that looks like an error, or overflow
* back into positive territory, and thus cause us to
* return a too-low count.
*
* Therefore, if the packet count is unlimited, we clip
* it at INT_MAX; this routine is not expected to
* process packets indefinitely, so that's not an issue.
*/
if (PACKET_COUNT_IS_UNLIMITED(cnt))
cnt = INT_MAX;
while (num <= cnt)
{
if (p->fd <= 0)
return (-1);
rc = pcap_read_one (p, callback, data);
if (rc > 0)
num++;
if (rc < 0)
break;
_w32_os_yield(); /* allow SIGINT generation, yield to Win95/NT */
}
return (num);
}
/*
* Return network statistics
*/
static int pcap_stats_dos (pcap_t *p, struct pcap_stat *ps)
{
struct net_device_stats *stats;
struct pcap_dos *pd;
struct device *dev = p ? get_device(p->fd) : NULL;
if (!dev)
{
strcpy (p->errbuf, "illegal pcap handle");
return (-1);
}
if (!dev->get_stats || (stats = (*dev->get_stats)(dev)) == NULL)
{
strcpy (p->errbuf, "device statistics not available");
return (-1);
}
FLUSHK();
pd = p->priv;
pd->stat.ps_recv = stats->rx_packets;
pd->stat.ps_drop += stats->rx_missed_errors;
pd->stat.ps_ifdrop = stats->rx_dropped + /* queue full */
stats->rx_errors; /* HW errors */
if (ps)
*ps = pd->stat;
return (0);
}
/*
* Return detailed network/device statistics.
* May be called after 'dev->close' is called.
*/
int pcap_stats_ex (pcap_t *p, struct pcap_stat_ex *se)
{
struct device *dev = p ? get_device (p->fd) : NULL;
if (!dev || !dev->get_stats)
{
pcap_strlcpy (p->errbuf, "detailed device statistics not available",
PCAP_ERRBUF_SIZE);
return (-1);
}
if (!strnicmp(dev->name,"pkt",3))
{
pcap_strlcpy (p->errbuf, "pktdrvr doesn't have detailed statistics",
PCAP_ERRBUF_SIZE);
return (-1);
}
memcpy (se, (*dev->get_stats)(dev), sizeof(*se));
return (0);
}
/*
* Simply store the filter-code for the pcap_read_dos() callback
* Some day the filter-code could be handed down to the active
* device (pkt_rx1.s or 32-bit device interrupt handler).
*/
static int pcap_setfilter_dos (pcap_t *p, struct bpf_program *fp)
{
if (!p)
return (-1);
p->fcode = *fp;
return (0);
}
/*
* Return # of packets received in pcap_read_dos()
*/
u_long pcap_mac_packets (void)
{
return (mac_count);
}
/*
* Return # of packets passed through filter in pcap_read_dos()
*/
u_long pcap_filter_packets (void)
{
return (filter_count);
}
/*
* Close pcap device. Not called for offline captures.
*/
static void pcap_cleanup_dos (pcap_t *p)
{
struct pcap_dos *pd;
if (!exc_occured)
{
pd = p->priv;
if (pcap_stats(p,NULL) < 0)
pd->stat.ps_drop = 0;
if (!get_device(p->fd))
return;
handle_to_device [p->fd-1] = NULL;
p->fd = 0;
if (ref_count > 0)
ref_count--;
if (ref_count > 0)
return;
}
close_driver();
/* XXX - call pcap_cleanup_live_common? */
}
/*
* Return the name of the 1st network interface,
* or NULL if none can be found.
*/
char *pcap_lookupdev (char *ebuf)
{
struct device *dev;
#ifdef USE_32BIT_DRIVERS
init_32bit();
#endif
for (dev = (struct device*)dev_base; dev; dev = dev->next)
{
PCAP_ASSERT (dev->probe);
if ((*dev->probe)(dev))
{
FLUSHK();
probed_dev = (struct device*) dev; /* remember last probed device */
return (char*) dev->name;
}
}
if (ebuf)
strcpy (ebuf, "No driver found");
return (NULL);
}
/*
* Gets localnet & netmask from Watt-32.
*/
int pcap_lookupnet (const char *device, bpf_u_int32 *localnet,
bpf_u_int32 *netmask, char *errbuf)
{
DWORD mask, net;
if (!_watt_is_init)
{
strcpy (errbuf, "pcap_open_offline() or pcap_activate() must be "
"called first");
return (-1);
}
mask = _w32_sin_mask;
net = my_ip_addr & mask;
if (net == 0)
{
if (IN_CLASSA(*netmask))
net = IN_CLASSA_NET;
else if (IN_CLASSB(*netmask))
net = IN_CLASSB_NET;
else if (IN_CLASSC(*netmask))
net = IN_CLASSC_NET;
else
{
snprintf (errbuf, PCAP_ERRBUF_SIZE, "inet class for 0x%lx unknown", mask);
return (-1);
}
}
*localnet = htonl (net);
*netmask = htonl (mask);
ARGSUSED (device);
return (0);
}
/*
* Get a list of all interfaces that are present and that we probe okay.
* Returns -1 on error, 0 otherwise.
* The list may be NULL empty if no interfaces were up and could be opened.
*/
int pcap_platform_finddevs (pcap_if_list_t *devlistp, char *errbuf)
{
struct device *dev;
pcap_if_t *curdev;
#if 0 /* Pkt drivers should have no addresses */
struct sockaddr_in sa_ll_1, sa_ll_2;
struct sockaddr *addr, *netmask, *broadaddr, *dstaddr;
#endif
int ret = 0;
int found = 0;
for (dev = (struct device*)dev_base; dev; dev = dev->next)
{
PCAP_ASSERT (dev->probe);
if (!(*dev->probe)(dev))
continue;
PCAP_ASSERT (dev->close); /* set by probe routine */
FLUSHK();
(*dev->close) (dev);
/*
* XXX - find out whether it's up or running? Does that apply here?
* Can we find out if anything's plugged into the adapter, if it's
* a wired device, and set PCAP_IF_CONNECTION_STATUS_CONNECTED
* or PCAP_IF_CONNECTION_STATUS_DISCONNECTED?
*/
if ((curdev = add_dev(devlistp, dev->name, 0,
dev->long_name, errbuf)) == NULL)
{
ret = -1;
break;
}
found = 1;
#if 0 /* Pkt drivers should have no addresses */
memset (&sa_ll_1, 0, sizeof(sa_ll_1));
memset (&sa_ll_2, 0, sizeof(sa_ll_2));
sa_ll_1.sin_family = AF_INET;
sa_ll_2.sin_family = AF_INET;
addr = (struct sockaddr*) &sa_ll_1;
netmask = (struct sockaddr*) &sa_ll_1;
dstaddr = (struct sockaddr*) &sa_ll_1;
broadaddr = (struct sockaddr*) &sa_ll_2;
memset (&sa_ll_2.sin_addr, 0xFF, sizeof(sa_ll_2.sin_addr));
if (add_addr_to_dev(curdev, addr, sizeof(*addr),
netmask, sizeof(*netmask),
broadaddr, sizeof(*broadaddr),
dstaddr, sizeof(*dstaddr), errbuf) < 0)
{
ret = -1;
break;
}
#endif
}
if (ret == 0 && !found)
strcpy (errbuf, "No drivers found");
return (ret);
}
/*
* pcap_assert() is mainly used for debugging
*/
void pcap_assert (const char *what, const char *file, unsigned line)
{
FLUSHK();
fprintf (stderr, "%s (%u): Assertion \"%s\" failed\n",
file, line, what);
close_driver();
_exit (-1);
}
/*
* For pcap_offline_read(): wait and yield between printing packets
* to simulate the pace packets where actually recorded.
*/
void pcap_set_wait (pcap_t *p, void (*yield)(void), int wait)
{
if (p)
{
struct pcap_dos *pd = p->priv;
pd->wait_proc = yield;
p->opt.timeout = wait;
}
}
/*
* Initialise a named network device.
*/
static struct device *
open_driver (const char *dev_name, char *ebuf, int promisc)
{
struct device *dev;
for (dev = (struct device*)dev_base; dev; dev = dev->next)
{
PCAP_ASSERT (dev->name);
if (strcmp (dev_name,dev->name))
continue;
if (!probed_dev) /* user didn't call pcap_lookupdev() first */
{
PCAP_ASSERT (dev->probe);
if (!(*dev->probe)(dev)) /* call the xx_probe() function */
{
snprintf (ebuf, PCAP_ERRBUF_SIZE, "failed to detect device `%s'", dev_name);
return (NULL);
}
probed_dev = dev; /* device is probed okay and may be used */
}
else if (dev != probed_dev)
{
goto not_probed;
}
FLUSHK();
/* Select what traffic to receive
*/
if (promisc)
dev->flags |= (IFF_ALLMULTI | IFF_PROMISC);
else dev->flags &= ~(IFF_ALLMULTI | IFF_PROMISC);
PCAP_ASSERT (dev->open);
if (!(*dev->open)(dev))
{
snprintf (ebuf, PCAP_ERRBUF_SIZE, "failed to activate device `%s'", dev_name);
if (pktInfo.error && !strncmp(dev->name,"pkt",3))
{
strcat (ebuf, ": ");
strcat (ebuf, pktInfo.error);
}
return (NULL);
}
/* Some devices need this to operate in promiscuous mode
*/
if (promisc && dev->set_multicast_list)
(*dev->set_multicast_list) (dev);
active_dev = dev; /* remember our active device */
break;
}
/* 'dev_name' not matched in 'dev_base' list.
*/
if (!dev)
{
snprintf (ebuf, PCAP_ERRBUF_SIZE, "device `%s' not supported", dev_name);
return (NULL);
}
not_probed:
if (!probed_dev)
{
snprintf (ebuf, PCAP_ERRBUF_SIZE, "device `%s' not probed", dev_name);
return (NULL);
}
return (dev);
}
/*
* Deinitialise MAC driver.
* Set receive mode back to default mode.
*/
static void close_driver (void)
{
/* !!todo: loop over all 'handle_to_device[]' ? */
struct device *dev = active_dev;
if (dev && dev->close)
{
(*dev->close) (dev);
FLUSHK();
}
active_dev = NULL;
#ifdef USE_32BIT_DRIVERS
if (rx_pool)
{
k_free (rx_pool);
rx_pool = NULL;
}
if (dev)
pcibios_exit();
#endif
}
#ifdef __DJGPP__
static void setup_signals (void (*handler)(int))
{
signal (SIGSEGV,handler);
signal (SIGILL, handler);
signal (SIGFPE, handler);
}
static void exc_handler (int sig)
{
#ifdef USE_32BIT_DRIVERS
if (active_dev->irq > 0) /* excludes IRQ 0 */
{
disable_irq (active_dev->irq);
irq_eoi_cmd (active_dev->irq);
_printk_safe = 1;
}
#endif
switch (sig)
{
case SIGSEGV:
fputs ("Catching SIGSEGV.\n", stderr);
break;
case SIGILL:
fputs ("Catching SIGILL.\n", stderr);
break;
case SIGFPE:
_fpreset();
fputs ("Catching SIGFPE.\n", stderr);
break;
default:
fprintf (stderr, "Catching signal %d.\n", sig);
}
exc_occured = 1;
close_driver();
}
#endif /* __DJGPP__ */
/*
* Open the pcap device for the first client calling pcap_activate()
*/
static int first_init (const char *name, char *ebuf, int promisc)
{
struct device *dev;
#ifdef USE_32BIT_DRIVERS
rx_pool = k_calloc (RECEIVE_BUF_SIZE, RECEIVE_QUEUE_SIZE);
if (!rx_pool)
{
strcpy (ebuf, "Not enough memory (Rx pool)");
return (0);
}
#endif
#ifdef __DJGPP__
setup_signals (exc_handler);
#endif
#ifdef USE_32BIT_DRIVERS
init_32bit();
#endif
dev = open_driver (name, ebuf, promisc);
if (!dev)
{
#ifdef USE_32BIT_DRIVERS
k_free (rx_pool);
rx_pool = NULL;
#endif
#ifdef __DJGPP__
setup_signals (SIG_DFL);
#endif
return (0);
}
#ifdef USE_32BIT_DRIVERS
/*
* If driver is NOT a 16-bit "pkt/ndis" driver (having a 'copy_rx_buf'
* set in it's probe handler), initialise near-memory ring-buffer for
* the 32-bit device.
*/
if (dev->copy_rx_buf == NULL)
{
dev->get_rx_buf = get_rxbuf;
dev->peek_rx_buf = peek_rxbuf;
dev->release_rx_buf = release_rxbuf;
pktq_init (&dev->queue, RECEIVE_BUF_SIZE, RECEIVE_QUEUE_SIZE, rx_pool);
}
#endif
return (1);
}
#ifdef USE_32BIT_DRIVERS
static void init_32bit (void)
{
static int init_pci = 0;
if (!_printk_file)
_printk_init (64*1024, NULL); /* calls atexit(printk_exit) */
if (!init_pci)
(void)pci_init(); /* init BIOS32+PCI interface */
init_pci = 1;
}
#endif
/*
* Hook functions for using Watt-32 together with pcap
*/
static char rxbuf [ETH_MAX+100]; /* rx-buffer with some margin */
static WORD etype;
static pcap_t pcap_save;
static void watt32_recv_hook (u_char *dummy, const struct pcap_pkthdr *pcap,
const u_char *buf)
{
/* Fix me: assumes Ethernet II only */
struct ether_header *ep = (struct ether_header*) buf;
memcpy (rxbuf, buf, pcap->caplen);
etype = ep->ether_type;
ARGSUSED (dummy);
}
#if (WATTCP_VER >= 0x0224)
/*
* This function is used by Watt-32 to poll for a packet.
* i.e. it's set to bypass _eth_arrived()
*/
static void *pcap_recv_hook (WORD *type)
{
int len = pcap_read_dos (&pcap_save, 1, watt32_recv_hook, NULL);
if (len < 0)
return (NULL);
*type = etype;
return (void*) &rxbuf;
}
/*
* This function is called by Watt-32 (via _eth_xmit_hook).
* If dbug_init() was called, we should trace packets sent.
*/
static int pcap_xmit_hook (const void *buf, unsigned len)
{
int rc = 0;
if (pcap_pkt_debug > 0)
dbug_write ("pcap_xmit_hook: ");
if (active_dev && active_dev->xmit)
if ((*active_dev->xmit) (active_dev, buf, len) > 0)
rc = len;
if (pcap_pkt_debug > 0)
dbug_write (rc ? "ok\n" : "fail\n");
return (rc);
}
#endif
static int pcap_sendpacket_dos (pcap_t *p, const void *buf, size_t len)
{
struct device *dev = p ? get_device(p->fd) : NULL;
if (!dev || !dev->xmit)
return (-1);
return (*dev->xmit) (dev, buf, len);
}
/*
* This function is called by Watt-32 in tcp_post_init().
* We should prevent Watt-32 from using BOOTP/DHCP/RARP etc.
*/
static void (*prev_post_hook) (void);
static void pcap_init_hook (void)
{
_w32__bootp_on = _w32__dhcp_on = _w32__rarp_on = 0;
_w32__do_mask_req = 0;
_w32_dynamic_host = 0;
if (prev_post_hook)
(*prev_post_hook)();
}
/*
* Suppress PRINT message from Watt-32's sock_init()
*/
static void null_print (void) {}
/*
* To use features of Watt-32 (netdb functions and socket etc.)
* we must call sock_init(). But we set various hooks to prevent
* using normal PKTDRVR functions in pcpkt.c. This should hopefully
* make Watt-32 and pcap co-operate.
*/
static int init_watt32 (struct pcap *pcap, const char *dev_name, char *err_buf)
{
char *env;
int rc, MTU, has_ip_addr;
int using_pktdrv = 1;
/* If user called sock_init() first, we need to reinit in
* order to open debug/trace-file properly
*/
if (_watt_is_init)
sock_exit();
env = getenv ("PCAP_TRACE");
if (env && atoi(env) > 0 &&
pcap_pkt_debug < 0) /* if not already set */
{
dbug_init();
pcap_pkt_debug = atoi (env);
}
_watt_do_exit = 0; /* prevent sock_init() calling exit() */
prev_post_hook = _w32_usr_post_init;
_w32_usr_post_init = pcap_init_hook;
_w32_print_hook = null_print;
if (dev_name && strncmp(dev_name,"pkt",3))
using_pktdrv = FALSE;
rc = sock_init();