/*
 * Copyright (c) 2000-2001 Boris Popov
 * All rights reserved.
 *
 * 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 Boris Popov.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: src/sys/netsmb/smb_subr.c,v 1.1.2.2 2001/09/03 08:55:11 bp Exp $
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/resourcevar.h>
#include <sys/sysctl.h>
#include <sys/socket.h>
#include <sys/signalvar.h>
#include <sys/wait.h>
#include <sys/unistd.h>

#include <sys/signal2.h>

#include <machine/stdarg.h>

#include <sys/iconv.h>

#include "smb.h"
#include "smb_conn.h"
#include "smb_rq.h"
#include "smb_subr.h"

MALLOC_DEFINE(M_SMBSTR, "SMBSTR", "netsmb string data");
MALLOC_DEFINE(M_SMBTEMP, "SMBTEMP", "Temp netsmb data");

smb_unichar smb_unieol = 0;

void
smb_makescred(struct smb_cred *scred, struct thread *td, struct ucred *cred)
{
        scred->scr_td = td;
        if (td && td->td_proc) {
                scred->scr_cred = cred ? cred : td->td_proc->p_ucred;
        } else {
                scred->scr_cred = cred ? cred : NULL;
        }
}

int
smb_proc_intr(struct thread *td)
{
        sigset_t tmpset;
        struct proc *p;
        struct lwp *lp;

        if (td == NULL || (p = td->td_proc) == NULL)
                return 0;
        lp = td->td_lwp;
        tmpset = lwp_sigpend(lp);
        SIGSETNAND(tmpset, lp->lwp_sigmask);
        SIGSETNAND(tmpset, p->p_sigignore);
        if (SIGNOTEMPTY(tmpset) && SMB_SIGMASK(tmpset))
                return EINTR;
        return 0;
}

char *
smb_strdup(const char *s)
{
        char *p;
        int len;

        len = s ? strlen(s) + 1 : 1;
        p = kmalloc(len, M_SMBSTR, M_WAITOK);
        if (s)
                bcopy(s, p, len);
        else
                *p = 0;
        return p;
}

/*
 * duplicate string from a user space.
 */
char *
smb_strdupin(char *s, int maxlen)
{
        char *p, bt;
        int len = 0;

        for (p = s; ;p++) {
                if (copyin(p, &bt, 1))
                        return NULL;
                len++;
                if (maxlen && len > maxlen)
                        return NULL;
                if (bt == 0)
                        break;
        }
        p = kmalloc(len, M_SMBSTR, M_WAITOK);
        copyin(s, p, len);
        return p;
}

/*
 * duplicate memory block from a user space.
 */
void *
smb_memdupin(void *umem, int len)
{
        char *p;

        if (len > 8 * 1024)
                return NULL;
        p = kmalloc(len, M_SMBSTR, M_WAITOK);
        if (copyin(umem, p, len) == 0)
                return p;
        kfree(p, M_SMBSTR);
        return NULL;
}

/*
 * duplicate memory block in the kernel space.
 */
void *
smb_memdup(const void *umem, int len)
{
        char *p;

        if (len > 8 * 1024)
                return NULL;
        p = kmalloc(len, M_SMBSTR, M_WAITOK);
        bcopy(umem, p, len);
        return p;
}

void
smb_strfree(char *s)
{
        kfree(s, M_SMBSTR);
}

void
smb_memfree(void *s)
{
        kfree(s, M_SMBSTR);
}

void *
smb_zmalloc(unsigned long size, struct malloc_type *type, int flags)
{

        return kmalloc(size, type, flags | M_ZERO);
}

void
smb_strtouni(u_int16_t *dst, const char *src)
{
        while (*src) {
                *dst++ = htole16(*src++);
        }
        *dst = 0;
}

#ifdef SMB_SOCKETDATA_DEBUG
void
m_dumpm(struct mbuf *m) {
        char *p;
        int len;
        kprintf("d=");
        while(m) {
                p=mtod(m,char *);
                len=m->m_len;
                kprintf("(%d)",len);
                while(len--){
                        kprintf("%02x ",((int)*(p++)) & 0xff);
                }
                m=m->m_next;
        }
        kprintf("\n");
}
#endif

int
smb_maperror(int eclass, int eno)
{
        if (eclass == 0 && eno == 0)
                return 0;
        switch (eclass) {
            case ERRDOS:
                switch (eno) {
                    case ERRbadfunc:
                    case ERRbadmcb:
                    case ERRbadenv:
                    case ERRbadformat:
                    case ERRrmuns:
                        return EINVAL;
                    case ERRbadfile:
                    case ERRbadpath:
                    case ERRremcd:
                    case 66:            /* nt returns it when share not available */
                    case 67:            /* observed from nt4sp6 when sharename wrong */
                        return ENOENT;
                    case ERRnofids:
                        return EMFILE;
                    case ERRnoaccess:
                    case ERRbadshare:
                        return EACCES;
                    case ERRbadfid:
                        return EBADF;
                    case ERRnomem:
                        return ENOMEM;  /* actually remote no mem... */
                    case ERRbadmem:
                        return EFAULT;
                    case ERRbadaccess:
                        return EACCES;
                    case ERRbaddata:
                        return E2BIG;
                    case ERRbaddrive:
                    case ERRnotready:   /* nt */
                        return ENXIO;
                    case ERRdiffdevice:
                        return EXDEV;
                    case ERRnofiles:
                        return 0;       /* eeof ? */
                        return ETXTBSY;
                    case ERRlock:
                        return EDEADLK;
                    case ERRfilexists:
                        return EEXIST;
                    case 123:           /* dunno what is it, but samba maps as noent */
                        return ENOENT;
                    case 145:           /* samba */
                        return ENOTEMPTY;
                    case 183:
                        return EEXIST;
                }
                break;
            case ERRSRV:
                switch (eno) {
                    case ERRerror:
                        return EINVAL;
                    case ERRbadpw:
                        return EAUTH;
                    case ERRaccess:
                        return EACCES;
                    case ERRinvnid:
                        return ENETRESET;
                    case ERRinvnetname:
                        SMBERROR("NetBIOS name is invalid\n");
                        return EAUTH;
                    case 3:             /* reserved and returned */
                        return EIO;
                    case 2239:          /* NT: account exists but disabled */
                        return EPERM;
                }
                break;
            case ERRHRD:
                switch (eno) {
                    case ERRnowrite:
                        return EROFS;
                    case ERRbadunit:
                        return ENODEV;
                    case ERRnotready:
                    case ERRbadcmd:
                    case ERRdata:
                        return EIO;
                    case ERRbadreq:
                        return EBADRPC;
                    case ERRbadshare:
                        return ETXTBSY;
                    case ERRlock:
                        return EDEADLK;
                }
                break;
        }
        SMBERROR("Unmapped error %d:%d\n", eclass, eno);
        return EBADRPC;
}

static int
smb_copy_iconv(struct mbchain *mbp, c_caddr_t src, caddr_t dst,
    size_t *srclen, size_t *dstlen)
{
        int error;
        size_t inlen = *srclen, outlen = *dstlen;

        error = iconv_conv((struct iconv_drv*)mbp->mb_udata, &src, &inlen,
            &dst, &outlen);
        if (inlen != *srclen || outlen != *dstlen) {
                *srclen -= inlen;
                *dstlen -= outlen;
                return 0;
        } else {
                return error;
        }
}

int
smb_put_dmem(struct mbchain *mbp, struct smb_vc *vcp, const char *src,
        int size, int caseopt)
{
        struct iconv_drv *dp = vcp->vc_toserver;

        if (size == 0)
                return 0;
        if (dp == NULL) {
                return mb_put_mem(mbp, src, size, MB_MSYSTEM);
        }
        mbp->mb_copy = smb_copy_iconv;
        mbp->mb_udata = dp;
        return mb_put_mem(mbp, src, size, MB_MCUSTOM);
}

int
smb_put_dstring(struct mbchain *mbp, struct smb_vc *vcp, const char *src,
        int caseopt)
{
        int error;

        error = smb_put_dmem(mbp, vcp, src, strlen(src), caseopt);
        if (error)
                return error;
        return mb_put_uint8(mbp, 0);
}

int
smb_put_asunistring(struct smb_rq *rqp, const char *src)
{
        struct mbchain *mbp = &rqp->sr_rq;
        struct iconv_drv *dp = rqp->sr_vc->vc_toserver;
        u_char c;
        int error;

        while (*src) {
                iconv_convmem(dp, &c, src++, 1);
                error = mb_put_uint16le(mbp, c);
                if (error)
                        return error;
        }
        return mb_put_uint16le(mbp, 0);
}

/*
 * Create a kernel process/thread/whatever.  It shares it's address space
 * with proc0 - ie: kernel only.
 *
 * XXX only the SMB protocol uses this, we should convert this mess to a
 * pure thread when possible.
 */
int
smb_kthread_create(void (*func)(void *), void *arg,
                   struct proc **newpp, int flags, const char *fmt, ...)
{
        int error;
        __va_list ap;
        struct proc *p2;
        struct lwp *lp2;

        error = fork1(&lwp0, RFMEM | RFFDG | RFPROC | flags, &p2);
        if (error)
                return error;

        /* save a global descriptor, if desired */
        if (newpp != NULL)
                *newpp = p2;

        /* this is a non-swapped system process */
        p2->p_flags |= P_SYSTEM;
        p2->p_sigacts->ps_flag |= PS_NOCLDWAIT;

        lp2 = ONLY_LWP_IN_PROC(p2);

        /* set up arg0 for 'ps', et al */
        __va_start(ap, fmt);
        kvsnprintf(p2->p_comm, sizeof(p2->p_comm), fmt, ap);
        __va_end(ap);

        lp2->lwp_thread->td_ucred = crhold(proc0.p_ucred);

        /* call the processes' main()... */
        cpu_set_fork_handler(lp2,
                             (void (*)(void *, struct trapframe *))func, arg);
        start_forked_proc(&lwp0, p2);

        return 0;
}

void
smb_kthread_exit(void)
{
        exit1(0);
}

/*
 * smb_sleep() icky compat routine.  Leave the token held through the tsleep
 * to interlock against the sleep.  Remember that the token could be lost
 * since we blocked, so reget or release as appropriate.
 */
int
smb_sleep(void *chan, struct smb_slock *sl, int slpflags, const char *wmesg, int timo)
{
        int error;

        if (sl) {
                tsleep_interlock(chan, slpflags);
                smb_sl_unlock(sl);
                error = tsleep(chan, slpflags | PINTERLOCKED, wmesg, timo);
                if ((slpflags & PDROP) == 0)
                        smb_sl_lock(sl);
        } else {
                error = tsleep(chan, slpflags, wmesg, timo);
        }
        return error;
}