minix/minix/net/inet/inet.c

/*	this file contains the interface of the network software with rest of
	minix. Furthermore it contains the main loop of the network task.

Copyright 1995 Philip Homburg
*/

#include "inet.h"

#include <fcntl.h>
#include <unistd.h>
#include <minix/ds.h>
#include <minix/endpoint.h>
#include <minix/chardriver.h>
#include <minix/rs.h>
#include <sys/types.h>
#include <pwd.h>

#include "mq.h"
#include "qp.h"
#include "proto.h"
#include "generic/type.h"

#include "generic/arp.h"
#include "generic/assert.h"
#include "generic/buf.h"
#include "generic/clock.h"
#include "generic/eth.h"
#include "generic/event.h"
#include "generic/ip.h"
#include "generic/psip.h"
#include "generic/rand256.h"
#include "generic/sr.h"
#include "generic/tcp.h"
#include "generic/udp.h"

THIS_FILE

#define RANDOM_DEV_NAME	"/dev/random"

endpoint_t this_proc;		/* Process number of this server. */

/* Killing Solaris */
int killer_inet= 0;

#ifdef BUF_CONSISTENCY_CHECK
extern int inet_buf_debug;
#endif

#if HZ_DYNAMIC
u32_t system_hz;
#endif

static void nw_conf(void);
static void nw_init(void);
static void ds_event(void);

/* SEF functions and variables. */
static void sef_local_startup(void);
static int sef_cb_init_fresh(int type, sef_init_info_t *info);

int main(int argc, char *argv[])
{
	message mess;
	int ipc_status;
	int r;

	/* SEF local startup. */
	sef_local_startup();

	while (TRUE)
	{
#ifdef BUF_CONSISTENCY_CHECK
		if (inet_buf_debug)
		{
			static int buf_debug_count= 0;

			if (++buf_debug_count >= inet_buf_debug)
			{
				buf_debug_count= 0;
				if (!bf_consistency_check())
					break;
			}
		}
#endif
		if (ev_head)
		{
			ev_process();
			continue;
		}
		if (clck_call_expire)
		{
			clck_expire_timers();
			continue;
		}

		r= sef_receive_status(ANY, &mess, &ipc_status);
		if (r<0)
		{
			ip_panic(("unable to receive: %d", r));
		}
		reset_time();
		if (mess.m_source == VFS_PROC_NR)
		{
			sr_rec(&mess, ipc_status);
		}
		else if (is_ipc_notify(ipc_status))
		{
			if (mess.m_source == CLOCK)
			{
				clck_tick(&mess);
			} 
			else if (mess.m_source == DS_PROC_NR)
			{
				/* DS notifies us of an event. */
				ds_event();
			}
			else
			{
				printf("inet: got unexpected notify from %d\n",
					mess.m_source);
			}
		}
		else if (mess.m_type == DL_CONF_REPLY ||
			mess.m_type == DL_TASK_REPLY ||
			mess.m_type == DL_STAT_REPLY)
		{
			eth_rec(&mess);
		}
		else
		{
			printf("inet: got bad message type 0x%x from %d\n",
				mess.m_type, mess.m_source);
		}
	}
	ip_panic(("task is not allowed to terminate"));
	return 1;
}

/*===========================================================================*
 *			       sef_local_startup			     *
 *===========================================================================*/
static void sef_local_startup()
{
  /* Register init callbacks. */
  sef_setcb_init_fresh(sef_cb_init_fresh);
  sef_setcb_init_restart(sef_cb_init_fresh);

  /* No live update support for now. */

  /* Let SEF perform startup. */
  sef_startup();
}

/*===========================================================================*
 *		            sef_cb_init_fresh                                *
 *===========================================================================*/
static int sef_cb_init_fresh(int type, sef_init_info_t *info)
{
/* Initialize the inet server. */
	int r;
	int timerand, fd;
	u8_t randbits[32];
	struct timeval tv;

#if DEBUG
	printf("Starting inet...\n");
	printf("%s\n", version);
#endif

#if HZ_DYNAMIC
	system_hz = sys_hz();
#endif

	/* Read configuration. */
	nw_conf();

	/* Get a random number */
	timerand= 1;
	fd= open(RANDOM_DEV_NAME, O_RDONLY | O_NONBLOCK);
	if (fd != -1)
	{
		r= read(fd, randbits, sizeof(randbits));
		if (r == sizeof(randbits))
			timerand= 0;
		else
		{
			printf("inet: unable to read random data from %s: %s\n",
				RANDOM_DEV_NAME, r == -1 ? strerror(errno) :
				r == 0 ? "EOF" : "not enough data");
		}
		close(fd);
	}
	else
	{
		printf("inet: unable to open random device %s: %s\n",
			RANDOM_DEV_NAME, strerror(errno));
	}
	if (timerand)
	{
		printf("inet: using current time for random-number seed\n");
		r= gettimeofday(&tv, NULL);
		if (r == -1)
		{
			printf("sysutime failed: %s\n", strerror(errno));
			exit(1);
		}
		memcpy(randbits, &tv, sizeof(tv));
	}
	init_rand256(randbits);

	/* Our new identity as a server. */
	this_proc= info->endpoint;

#ifdef BUF_CONSISTENCY_CHECK
	inet_buf_debug= (getenv("inetbufdebug") && 
		(strcmp(getenv("inetbufdebug"), "on") == 0));
	inet_buf_debug= 100;
	if (inet_buf_debug)
	{
		ip_warning(( "buffer consistency check enabled" ));
	}
#endif

	if (getenv("killerinet"))
	{
		ip_warning(( "killer inet active" ));
		killer_inet= 1;
	}

	nw_init();

	/* Subscribe to driver events for network drivers. */
	r = ds_subscribe("drv\\.net\\..*", DSF_INITIAL | DSF_OVERWRITE);
	if(r != OK) {
		ip_panic(("inet: can't subscribe to driver events"));
	}

	/* Drop privileges. */
	if (setuid(SERVICE_UID) != 0)
		printf("inet: warning, unable to drop privileges\n");

	/* Announce we are up. INET announces its presence to VFS just like
	 * any other character driver.
	 */
	chardriver_announce();

	return(OK);
}

static void nw_conf()
{
	read_conf();
	eth_prep();
	arp_prep();
	psip_prep();
	ip_prep();
	tcp_prep();
	udp_prep();
}

static void nw_init()
{
	mq_init();
	bf_init();
	clck_init();
	sr_init();
	qp_init();
	eth_init();
	arp_init();
	psip_init();
	ip_init();
	tcp_init();
	udp_init();
}

/*===========================================================================*
 *				 ds_event				     *
 *===========================================================================*/
static void ds_event()
{
	char key[DS_MAX_KEYLEN];
	char *driver_prefix = (char *) "drv.net.";
	char *label;
	u32_t value;
	int type;
	endpoint_t owner_endpoint;
	int r;
	int prefix_len;

	prefix_len = strlen(driver_prefix);

	/* We may get one notification for multiple updates from DS. Get events
	 * and owners from DS, until DS tells us that there are no more.
	 */
	while ((r = ds_check(key, &type, &owner_endpoint)) == OK) {
		r = ds_retrieve_u32(key, &value);
		if(r != OK) {
			printf("inet: ds_event: ds_retrieve_u32 failed\n");
			return;
		}

		/* Only check for network driver up events. */
		if(strncmp(key, driver_prefix, prefix_len)
		   || value != DS_DRIVER_UP) {
			return;
		}

		/* The driver label comes after the prefix. */
		label = key + prefix_len;

		/* A driver is (re)started. */
		eth_check_driver(label, owner_endpoint);
	}

	if(r != ENOENT)
		printf("inet: ds_event: ds_check failed: %d\n", r);
}

void panic0(file, line)
char *file;
int line;
{
	printf("panic at %s, %d: ", file, line);
}

__dead
void inet_panic(void)
{
	printf("\ninet stacktrace: ");
	util_stacktrace();
	(panic)("aborted due to a panic");
	for(;;);
}

#if !NDEBUG
__dead
void bad_assertion(file, line, what)
char *file;
int line;
char *what;
{
	panic0(file, line);
	printf("assertion \"%s\" failed", what);
	panic("help");
}


__dead
void bad_compare(file, line, lhs, what, rhs)
char *file;
int line;
int lhs;
char *what;
int rhs;
{
	panic0(file, line);
	printf("compare (%d) %s (%d) failed", lhs, what, rhs);
	panic("help");
}
#endif /* !NDEBUG */

/*
 * $PchId: inet.c,v 1.23 2005/06/28 14:27:22 philip Exp $
 */