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[dragonfly.git] / libexec / rbootd / utils.c

/*
 * Copyright (c) 1988, 1992 The University of Utah and the Center
 *      for Software Science (CSS).
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Center for Software Science of the University of Utah Computer
 * Science Department.  CSS requests users of this software to return
 * to css-dist@cs.utah.edu any improvements that they make and grant
 * CSS redistribution rights.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from: @(#)utils.c       8.1 (Berkeley) 6/4/93
 *
 * From: Utah Hdr: utils.c 3.1 92/07/06
 * Author: Jeff Forys, University of Utah CSS
 *
 * @(#)utils.c  8.1 (Berkeley) 6/4/93
 * $FreeBSD: src/libexec/rbootd/utils.c,v 1.5 1999/08/28 00:09:46 peter Exp $
 * $DragonFly: src/libexec/rbootd/utils.c,v 1.2 2003/06/17 04:27:07 dillon Exp $
 */

#include <sys/param.h>
#include <sys/time.h>

#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include "defs.h"

/*
**  DispPkt -- Display the contents of an RMPCONN packet.
**
**      Parameters:
**              rconn - packet to be displayed.
**              direct - direction packet is going (DIR_*).
**
**      Returns:
**              Nothing.
**
**      Side Effects:
**              None.
*/
void
DispPkt(rconn, direct)
        RMPCONN *rconn;
        int direct;
{
        static char BootFmt[] = "\t\tRetCode:%u SeqNo:%lx SessID:%x Vers:%u";
        static char ReadFmt[] = "\t\tRetCode:%u Offset:%lx SessID:%x\n";

        struct tm *tmp;
        struct rmp_packet *rmp;
        int i, omask;
        u_int32_t t;

        /*
         *  Since we will be working with RmpConns as well as DbgFp, we
         *  must block signals that can affect either.
         */
        omask = sigblock(sigmask(SIGHUP)|sigmask(SIGUSR1)|sigmask(SIGUSR2));

        if (DbgFp == NULL) {                    /* sanity */
                (void) sigsetmask(omask);
                return;
        }

        /* display direction packet is going using '>>>' or '<<<' */
        fputs((direct==DIR_RCVD)?"<<< ":(direct==DIR_SENT)?">>> ":"", DbgFp);

        /* display packet timestamp */
        tmp = localtime((time_t *)&rconn->tstamp.tv_sec);
        fprintf(DbgFp, "%02d:%02d:%02d.%06ld   ", tmp->tm_hour, tmp->tm_min,
                tmp->tm_sec, rconn->tstamp.tv_usec);

        /* display src or dst addr and information about network interface */
        fprintf(DbgFp, "Addr: %s   Intf: %s\n", EnetStr(rconn), IntfName);

        rmp = &rconn->rmp;

        /* display IEEE 802.2 Logical Link Control header */
        (void) fprintf(DbgFp, "\t802.2 LLC: DSAP:%x SSAP:%x CTRL:%x\n",
               rmp->hp_llc.dsap, rmp->hp_llc.ssap, ntohs(rmp->hp_llc.cntrl));

        /* display HP extensions to 802.2 Logical Link Control header */
        (void) fprintf(DbgFp, "\tHP Ext:    DXSAP:%x SXSAP:%x\n",
                       ntohs(rmp->hp_llc.dxsap), ntohs(rmp->hp_llc.sxsap));

        /*
         *  Display information about RMP packet using type field to
         *  determine what kind of packet this is.
         */
        switch(rmp->r_type) {
                case RMP_BOOT_REQ:              /* boot request */
                        (void) fprintf(DbgFp, "\tBoot Request:");
                        GETWORD(rmp->r_brq.rmp_seqno, t);
                        if (ntohs(rmp->r_brq.rmp_session) == RMP_PROBESID) {
                                if (WORDZE(rmp->r_brq.rmp_seqno))
                                        fputs(" (Send Server ID)", DbgFp);
                                else
                                        fprintf(DbgFp," (Send Filename #%u)",t);
                        }
                        (void) fputc('\n', DbgFp);
                        (void) fprintf(DbgFp, BootFmt, rmp->r_brq.rmp_retcode,
                                t, ntohs(rmp->r_brq.rmp_session),
                                ntohs(rmp->r_brq.rmp_version));
                        (void) fprintf(DbgFp, "\n\t\tMachine Type: ");
                        for (i = 0; i < RMP_MACHLEN; i++)
                                (void) fputc(rmp->r_brq.rmp_machtype[i], DbgFp);
                        DspFlnm(rmp->r_brq.rmp_flnmsize, &rmp->r_brq.rmp_flnm);
                        break;
                case RMP_BOOT_REPL:             /* boot reply */
                        fprintf(DbgFp, "\tBoot Reply:\n");
                        GETWORD(rmp->r_brpl.rmp_seqno, t);
                        (void) fprintf(DbgFp, BootFmt, rmp->r_brpl.rmp_retcode,
                                t, ntohs(rmp->r_brpl.rmp_session),
                                ntohs(rmp->r_brpl.rmp_version));
                        DspFlnm(rmp->r_brpl.rmp_flnmsize,&rmp->r_brpl.rmp_flnm);
                        break;
                case RMP_READ_REQ:              /* read request */
                        (void) fprintf(DbgFp, "\tRead Request:\n");
                        GETWORD(rmp->r_rrq.rmp_offset, t);
                        (void) fprintf(DbgFp, ReadFmt, rmp->r_rrq.rmp_retcode,
                                t, ntohs(rmp->r_rrq.rmp_session));
                        (void) fprintf(DbgFp, "\t\tNoOfBytes: %u\n",
                                ntohs(rmp->r_rrq.rmp_size));
                        break;
                case RMP_READ_REPL:             /* read reply */
                        (void) fprintf(DbgFp, "\tRead Reply:\n");
                        GETWORD(rmp->r_rrpl.rmp_offset, t);
                        (void) fprintf(DbgFp, ReadFmt, rmp->r_rrpl.rmp_retcode,
                                t, ntohs(rmp->r_rrpl.rmp_session));
                        (void) fprintf(DbgFp, "\t\tNoOfBytesSent: %d\n",
                                rconn->rmplen - RMPREADSIZE(0));
                        break;
                case RMP_BOOT_DONE:             /* boot complete */
                        (void) fprintf(DbgFp, "\tBoot Complete:\n");
                        (void) fprintf(DbgFp, "\t\tRetCode:%u SessID:%x\n",
                                rmp->r_done.rmp_retcode,
                                ntohs(rmp->r_done.rmp_session));
                        break;
                default:                        /* ??? */
                        (void) fprintf(DbgFp, "\tUnknown Type:(%d)\n",
                                rmp->r_type);
        }
        (void) fputc('\n', DbgFp);
        (void) fflush(DbgFp);

        (void) sigsetmask(omask);               /* reset old signal mask */
}


/*
**  GetEtherAddr -- convert an RMP (Ethernet) address into a string.
**
**      An RMP BOOT packet has been received.  Look at the type field
**      and process Boot Requests, Read Requests, and Boot Complete
**      packets.  Any other type will be dropped with a warning msg.
**
**      Parameters:
**              addr - array of RMP_ADDRLEN bytes.
**
**      Returns:
**              Pointer to static string representation of `addr'.
**
**      Side Effects:
**              None.
**
**      Warnings:
**              - The return value points to a static buffer; it must
**                be copied if it's to be saved.
*/
char *
GetEtherAddr(addr)
        u_int8_t *addr;
{
        static char Hex[] = "0123456789abcdef";
        static char etherstr[RMP_ADDRLEN*3];
        int i;
        char *cp;

        /*
         *  For each byte in `addr', convert it to "<hexchar><hexchar>:".
         *  The last byte does not get a trailing `:' appended.
         */
        i = 0;
        cp = etherstr;
        for(;;) {
                *cp++ = Hex[*addr >> 4 & 0xf];
                *cp++ = Hex[*addr++ & 0xf];
                if (++i == RMP_ADDRLEN)
                        break;
                *cp++ = ':';
        }
        *cp = '\0';

        return(etherstr);
}


/*
**  DispFlnm -- Print a string of bytes to DbgFp (often, a file name).
**
**      Parameters:
**              size - number of bytes to print.
**              flnm - address of first byte.
**
**      Returns:
**              Nothing.
**
**      Side Effects:
**              - Characters are sent to `DbgFp'.
*/
void
DspFlnm(size, flnm)
        u_int size;
        char *flnm;
{
        int i;

        (void) fprintf(DbgFp, "\n\t\tFile Name (%u): <", size);
        for (i = 0; i < size; i++)
                (void) fputc(*flnm++, DbgFp);
        (void) fputs(">\n", DbgFp);
}


/*
**  NewClient -- allocate memory for a new CLIENT.
**
**      Parameters:
**              addr - RMP (Ethernet) address of new client.
**
**      Returns:
**              Ptr to new CLIENT or NULL if we ran out of memory.
**
**      Side Effects:
**              - Memory will be malloc'd for the new CLIENT.
**              - If malloc() fails, a log message will be generated.
*/
CLIENT *
NewClient(addr)
        u_int8_t *addr;
{
        CLIENT *ctmp;

        if ((ctmp = (CLIENT *) malloc(sizeof(CLIENT))) == NULL) {
                syslog(LOG_ERR, "NewClient: out of memory (%s)",
                       GetEtherAddr(addr));
                return(NULL);
        }

        memset(ctmp, 0, sizeof(CLIENT));
        memmove(&ctmp->addr[0], addr, RMP_ADDRLEN);
        return(ctmp);
}

/*
**  FreeClient -- free linked list of Clients.
**
**      Parameters:
**              None.
**
**      Returns:
**              Nothing.
**
**      Side Effects:
**              - All malloc'd memory associated with the linked list of
**                CLIENTS will be free'd; `Clients' will be set to NULL.
**
**      Warnings:
**              - This routine must be called with SIGHUP blocked.
*/
void
FreeClients()
{
        CLIENT *ctmp;

        while (Clients != NULL) {
                ctmp = Clients;
                Clients = Clients->next;
                FreeClient(ctmp);
        }
}

/*
**  NewStr -- allocate memory for a character array.
**
**      Parameters:
**              str - null terminated character array.
**
**      Returns:
**              Ptr to new character array or NULL if we ran out of memory.
**
**      Side Effects:
**              - Memory will be malloc'd for the new character array.
**              - If malloc() fails, a log message will be generated.
*/
char *
NewStr(str)
        char *str;
{
        char *stmp;

        if ((stmp = (char *)malloc((unsigned) (strlen(str)+1))) == NULL) {
                syslog(LOG_ERR, "NewStr: out of memory (%s)", str);
                return(NULL);
        }

        (void) strcpy(stmp, str);
        return(stmp);
}

/*
**  To save time, NewConn and FreeConn maintain a cache of one RMPCONN
**  in `LastFree' (defined below).
*/

static RMPCONN *LastFree = NULL;

/*
**  NewConn -- allocate memory for a new RMPCONN connection.
**
**      Parameters:
**              rconn - initialization template for new connection.
**
**      Returns:
**              Ptr to new RMPCONN or NULL if we ran out of memory.
**
**      Side Effects:
**              - Memory may be malloc'd for the new RMPCONN (if not cached).
**              - If malloc() fails, a log message will be generated.
*/
RMPCONN *
NewConn(rconn)
        RMPCONN *rconn;
{
        RMPCONN *rtmp;

        if (LastFree == NULL) {         /* nothing cached; make a new one */
                if ((rtmp = (RMPCONN *) malloc(sizeof(RMPCONN))) == NULL) {
                        syslog(LOG_ERR, "NewConn: out of memory (%s)",
                               EnetStr(rconn));
                        return(NULL);
                }
        } else {                        /* use the cached RMPCONN */
                rtmp = LastFree;
                LastFree = NULL;
        }

        /*
         *  Copy template into `rtmp', init file descriptor to `-1' and
         *  set ptr to next elem NULL.
         */
        memmove((char *)rtmp, (char *)rconn, sizeof(RMPCONN));
        rtmp->bootfd = -1;
        rtmp->next = NULL;

        return(rtmp);
}

/*
**  FreeConn -- Free memory associated with an RMPCONN connection.
**
**      Parameters:
**              rtmp - ptr to RMPCONN to be free'd.
**
**      Returns:
**              Nothing.
**
**      Side Effects:
**              - Memory associated with `rtmp' may be free'd (or cached).
**              - File desc associated with `rtmp->bootfd' will be closed.
*/
void
FreeConn(rtmp)
        RMPCONN *rtmp;
{
        /*
         *  If the file descriptor is in use, close the file.
         */
        if (rtmp->bootfd >= 0) {
                (void) close(rtmp->bootfd);
                rtmp->bootfd = -1;
        }

        if (LastFree == NULL)           /* cache for next time */
                rtmp = LastFree;
        else                            /* already one cached; free this one */
                free((char *)rtmp);
}

/*
**  FreeConns -- free linked list of RMPCONN connections.
**
**      Parameters:
**              None.
**
**      Returns:
**              Nothing.
**
**      Side Effects:
**              - All malloc'd memory associated with the linked list of
**                connections will be free'd; `RmpConns' will be set to NULL.
**              - If LastFree is != NULL, it too will be free'd & NULL'd.
**
**      Warnings:
**              - This routine must be called with SIGHUP blocked.
*/
void
FreeConns()
{
        RMPCONN *rtmp;

        while (RmpConns != NULL) {
                rtmp = RmpConns;
                RmpConns = RmpConns->next;
                FreeConn(rtmp);
        }

        if (LastFree != NULL) {
                free((char *)LastFree);
                LastFree = NULL;
        }
}

/*
**  AddConn -- Add a connection to the linked list of connections.
**
**      Parameters:
**              rconn - connection to be added.
**
**      Returns:
**              Nothing.
**
**      Side Effects:
**              - RmpConn will point to new connection.
**
**      Warnings:
**              - This routine must be called with SIGHUP blocked.
*/
void
AddConn(rconn)
        RMPCONN *rconn;
{
        if (RmpConns != NULL)
                rconn->next = RmpConns;
        RmpConns = rconn;
}

/*
**  FindConn -- Find a connection in the linked list of connections.
**
**      We use the RMP (Ethernet) address as the basis for determining
**      if this is the same connection.  According to the Remote Maint
**      Protocol, we can only have one connection with any machine.
**
**      Parameters:
**              rconn - connection to be found.
**
**      Returns:
**              Matching connection from linked list or NULL if not found.
**
**      Side Effects:
**              None.
**
**      Warnings:
**              - This routine must be called with SIGHUP blocked.
*/
RMPCONN *
FindConn(rconn)
        RMPCONN *rconn;
{
        RMPCONN *rtmp;

        for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next)
                if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0],
                         (char *)&rtmp->rmp.hp_hdr.saddr[0], RMP_ADDRLEN) == 0)
                        break;

        return(rtmp);
}

/*
**  RemoveConn -- Remove a connection from the linked list of connections.
**
**      Parameters:
**              rconn - connection to be removed.
**
**      Returns:
**              Nothing.
**
**      Side Effects:
**              - If found, an RMPCONN will cease to exist and it will
**                be removed from the linked list.
**
**      Warnings:
**              - This routine must be called with SIGHUP blocked.
*/
void
RemoveConn(rconn)
        RMPCONN *rconn;
{
        RMPCONN *thisrconn, *lastrconn;

        if (RmpConns == rconn) {                /* easy case */
                RmpConns = RmpConns->next;
                FreeConn(rconn);
        } else {                                /* must traverse linked list */
                lastrconn = RmpConns;                   /* set back ptr */
                thisrconn = lastrconn->next;            /* set current ptr */
                while (thisrconn != NULL) {
                        if (rconn == thisrconn) {               /* found it */
                                lastrconn->next = thisrconn->next;
                                FreeConn(thisrconn);
                                break;
                        }
                        lastrconn = thisrconn;
                        thisrconn = thisrconn->next;
                }
        }
}