/*-
 * Copyright (c) 1988, 1993
 *      The Regents of the University of California.  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. 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.
 *
 * @(#) Copyright (c) 1988, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)fstat.c  8.3 (Berkeley) 5/2/95
 * $FreeBSD: src/usr.bin/fstat/fstat.c,v 1.21.2.7 2001/11/21 10:49:37 dwmalone Exp $
 */

#include <sys/user.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/un.h>
#include <sys/unpcb.h>
#include <sys/sysctl.h>
#include <sys/filedesc.h>
#include <sys/queue.h>
#include <sys/pipe.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/ktrace.h>
#include <vfs/ufs/quota.h>
#include <vfs/ufs/inode.h>
#include <sys/mount.h>
#include <sys/namecache.h>
#include <vfs/nfs/nfsproto.h>
#include <vfs/nfs/rpcv2.h>
#include <vfs/nfs/nfs.h>
#include <vfs/nfs/nfsnode.h>
#include <sys/devfs.h>

#include <vm/vm.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>

#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>

#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <nlist.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>

#include "fstat.h"

#define TEXT    -1
#define CDIR    -2
#define RDIR    -3
#define TRACE   -4
#define MMAP    -5

DEVS *devs;

static void make_printable(char *buf, int len);

#ifdef notdef
struct nlist nl[] = {
        { "" },
};
#endif

int     fsflg,  /* show files on same filesystem as file(s) argument */
        pflg,   /* show files open by a particular pid */
        uflg;   /* show files open by a particular (effective) user */
int     checkfile; /* true if restricting to particular files or filesystems */
int     nflg;   /* (numerical) display f.s. and rdev as dev_t */
int     vflg;   /* display errors in locating kernel data objects etc... */
int     mflg;   /* include memory-mapped files */
int     wflg_mnt = 16;
int     wflg_cmd = 10;
int     pid_width = 5;
int     ino_width = 9;

const char *Uname;
char    *Comm;
int     Pid;

struct fdnode *ofiles;  /* buffer of pointers to file structures */
int maxfiles;

#define ALLOC_OFILES(d) \
        if ((d) > maxfiles) { \
                free(ofiles); \
                ofiles = malloc((d) * sizeof(struct fdnode)); \
                if (ofiles == NULL) { \
                        err(1, NULL); \
                } \
                maxfiles = (d); \
        }

kvm_t *kd;

static void dofiles(struct kinfo_proc *, struct proc *);
static void dommap(struct proc *);
static void vtrans_reset(void);
static void vtrans(struct vnode *, struct nchandle *, int, int, off_t);
static int  ufs_filestat(struct vnode *, struct filestat *);
static int  nfs_filestat(struct vnode *, struct filestat *);
static int  devfs_filestat(struct vnode *, struct filestat *);
static char *getmnton(struct mount *, struct namecache_list *, struct nchandle *);
static void pipetrans(struct pipe *, int, int);
static void socktrans(struct socket *, int);
static void getinetproto(int);
static int  getfname(const char *);
static void usage(void) __dead2;


int
main(int argc, char **argv)
{
        struct passwd *passwd;
        struct kinfo_proc *p, *plast;
        struct proc proc;
        int arg, ch, what;
        char *memf, *nlistf;
        char buf[_POSIX2_LINE_MAX];
        int cnt;

        arg = 0;
        what = KERN_PROC_ALL;
        nlistf = memf = NULL;
        while ((ch = getopt(argc, argv, "fmnp:u:vwN:M:")) != -1)
                switch((char)ch) {
                case 'f':
                        fsflg = 1;
                        break;
                case 'M':
                        memf = optarg;
                        break;
                case 'N':
                        nlistf = optarg;
                        break;
                case 'm':
                        mflg = 1;
                        break;
                case 'n':
                        nflg = 1;
                        break;
                case 'p':
                        if (pflg++)
                                usage();
                        if (!isdigit(*optarg)) {
                                warnx("-p requires a process id");
                                usage();
                        }
                        what = KERN_PROC_PID;
                        arg = atoi(optarg);
                        break;
                case 'u':
                        if (uflg++)
                                usage();
                        if (!(passwd = getpwnam(optarg)))
                                errx(1, "%s: unknown uid", optarg);
                        what = KERN_PROC_UID;
                        arg = passwd->pw_uid;
                        break;
                case 'v':
                        vflg = 1;
                        break;
                case 'w':
                        wflg_mnt = 40;
                        wflg_cmd = 16;
                        break;
                case '?':
                default:
                        usage();
                }

        if (*(argv += optind)) {
                for (; *argv; ++argv) {
                        if (getfname(*argv))
                                checkfile = 1;
                }
                if (!checkfile) /* file(s) specified, but none accessable */
                        exit(1);
        }

        ALLOC_OFILES(256);      /* reserve space for file pointers */

        if (fsflg && !checkfile) {
                /* -f with no files means use wd */
                if (getfname(".") == 0)
                        exit(1);
                checkfile = 1;
        }

        /*
         * Discard setgid privileges if not the running kernel so that bad
         * guys can't print interesting stuff from kernel memory.
         */
        if (nlistf != NULL || memf != NULL)
                setgid(getgid());

        if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf)) == NULL)
                errx(1, "%s", buf);
#ifdef notdef
        if (kvm_nlist(kd, nl) != 0)
                errx(1, "no namelist: %s", kvm_geterr(kd));
#endif
        if ((p = kvm_getprocs(kd, what, arg, &cnt)) == NULL)
                errx(1, "%s", kvm_geterr(kd));
        if (nflg)
                printf("USER     %-*.*s %*.*s   FD DEV              %*.*s MODE   SZ|DV R/W", 
                        wflg_cmd, wflg_cmd, "CMD",
                        pid_width, pid_width, "PID",
                        ino_width, ino_width, "INUM");
        else
                printf("USER     %-*.*s %*.*s   FD %-*.*s %*.*s MODE           SZ|DV R/W", 
                        wflg_cmd, wflg_cmd, "CMD", 
                        pid_width, pid_width, "PID",
                        wflg_mnt, wflg_mnt, "PATH",
                        ino_width, ino_width, "INUM");
        if (checkfile && fsflg == 0)
                printf(" NAME\n");
        else
                putchar('\n');

        for (plast = &p[cnt]; p < plast; ++p) {
                if (p->kp_stat == SZOMB)
                        continue;
                if (!kread((void *)p->kp_paddr, &proc, sizeof(proc))) {
                        dprintf(stderr, "can't read proc at %p for pid %d\n",
                            (void *)p->kp_paddr, Pid);
                        continue;
                }
                dofiles(p, &proc);
                if (mflg)
                        dommap(&proc);
        }
        exit(0);
}

#define PREFIX(i) \
        printf("%-8.8s %-*s %*d", Uname, wflg_cmd, Comm, pid_width, Pid); \
        switch(i) { \
        case TEXT: \
                printf(" text"); \
                break; \
        case CDIR: \
                printf("   wd"); \
                break; \
        case RDIR: \
                printf(" root"); \
                break; \
        case TRACE: \
                printf("   tr"); \
                break; \
        case MMAP: \
                printf(" mmap"); \
                break; \
        default: \
                printf(" %4d", i); \
                break; \
        }

/*
 * print open files attributed to this process
 */
static void
dofiles(struct kinfo_proc *kp, struct proc *p)
{
        int i;
        struct file file;
        struct filedesc filed;
        struct ktrace_node ktrace_node;

        Uname = user_from_uid(kp->kp_uid, 0);
        Pid = kp->kp_pid;
        Comm = kp->kp_comm;
        make_printable(Comm, strlen(Comm));

        if (p->p_fd == NULL)
                return;
        if (!kread(p->p_fd, &filed, sizeof (filed))) {
                dprintf(stderr, "can't read filedesc at %p for pid %d\n",
                    (void *)p->p_fd, Pid);
                return;
        }

        vtrans_reset();

        /*
         * root directory vnode, if one
         */
        if (filed.fd_rdir)
                vtrans(filed.fd_rdir, &filed.fd_nrdir, RDIR, FREAD, 0);
        /*
         * current working directory vnode
         */
        vtrans(filed.fd_cdir, &filed.fd_ncdir, CDIR, FREAD, 0);
        /*
         * ktrace vnode, if one
         */
        if (p->p_tracenode) {
                if (kread(p->p_tracenode, &ktrace_node, sizeof (ktrace_node)))
                        vtrans(ktrace_node.kn_vp, NULL, TRACE, FREAD|FWRITE, 0);
        }
        /*
         * text vnode, if one
         */
        if (p->p_textvp)
                vtrans(p->p_textvp, NULL, TEXT, FREAD, 0);
        /*
         * open files
         */
        ALLOC_OFILES(filed.fd_lastfile+1);
        if (!kread(filed.fd_files, ofiles,
            (filed.fd_lastfile+1) * sizeof(struct fdnode))) {
                dprintf(stderr,
                    "can't read file structures at %p for pid %d\n",
                    (void *)filed.fd_files, Pid);
                return;
        }
        for (i = 0; i <= filed.fd_lastfile; i++) {
                if (ofiles[i].fp == NULL)
                        continue;
                if (!kread(ofiles[i].fp, &file, sizeof (struct file))) {
                        dprintf(stderr, "can't read file %d at %p for pid %d\n",
                            i, (void *)ofiles[i].fp, Pid);
                        continue;
                }
                if (file.f_type == DTYPE_VNODE) {
                        vtrans((struct vnode *)file.f_data, &file.f_nchandle,
                                i, file.f_flag, file.f_offset);
                } else if (file.f_type == DTYPE_SOCKET) {
                        if (checkfile == 0)
                                socktrans((struct socket *)file.f_data, i);
                }
#ifdef DTYPE_PIPE
                else if (file.f_type == DTYPE_PIPE) {
                        if (checkfile == 0)
                                pipetrans((struct pipe *)file.f_data, i,
                                    file.f_flag);
                }
#endif
#ifdef DTYPE_FIFO
                else if (file.f_type == DTYPE_FIFO) {
                        if (checkfile == 0)
                                vtrans((struct vnode *)file.f_data,
                                        &file.f_nchandle,
                                        i, file.f_flag, file.f_offset);
                }
#endif
                else {
                        dprintf(stderr,
                            "unknown file type %d for file %d of pid %d\n",
                            file.f_type, i, Pid);
                }
        }
}

static void
dommap(struct proc *p)
{
        struct vmspace vmspace;
        vm_map_t map;
        struct vm_map_entry entry;
        vm_map_entry_t ken;
        struct vm_object object;
        struct vm_map_backing ba;
        vm_object_t objp;
        int prot, fflags;

        if (!kread(p->p_vmspace, &vmspace, sizeof(vmspace))) {
                dprintf(stderr, "can't read vmspace at %p for pid %d\n",
                    (void *)p->p_vmspace, Pid);
                return;
        }

        map = &vmspace.vm_map;
        for (ken = kvm_vm_map_entry_first(kd, map, &entry);
             ken; ken = kvm_vm_map_entry_next(kd, ken, &entry)) {
                if (entry.maptype == VM_MAPTYPE_SUBMAP)
                        continue;

                if (entry.ba.object == NULL)
                        continue;
                ba = entry.ba;
                for (;;) {
                        if ((objp = entry.ba.object) != NULL) {
                                if (!kread(objp, &object, sizeof(object))) {
                                        dprintf(stderr,
                                            "can't read vm_object at %p "
                                            "for pid %d\n",
                                            (void *)objp, Pid);
                                        return;
                                }
                        }
                        if (ba.backing_ba == NULL)
                                break;
                        if (!kread(ba.backing_ba, &ba, sizeof(ba))) {
                                dprintf(stderr,
                                    "can't read map_backing at %p "
                                    "for pid %d\n",
                                    (void *)ba.backing_ba, Pid);
                                return;
                        }
                }

                prot = entry.protection;
                fflags = (prot & VM_PROT_READ ? FREAD : 0) |
                         (prot & VM_PROT_WRITE ? FWRITE : 0);

                switch (object.type) {
                case OBJT_VNODE:
                        vtrans((struct vnode *)object.handle, NULL, 
                                MMAP, fflags, 0);
                        break;
                default:
                        break;
                }
        }
}

static int last_name_width;

static void
vtrans_reset(void)
{
        last_name_width = 0;
}

static void
vtrans(struct vnode *vp, struct nchandle *ncr, int i, int flag, off_t off)
{
        struct vnode vn;
        struct filestat fst;
        char rw[3], mode[15];
        const char *badtype = NULL, *filename;
        char *name;
        int len;
        int extra_space;

        fst.offset = off;
        filename = badtype = NULL;
        if (!kread(vp, &vn, sizeof (struct vnode))) {
                dprintf(stderr, "can't read vnode at %p for pid %d\n",
                    (void *)vp, Pid);
                return;
        }
        if (vn.v_type == VNON || vn.v_tag == VT_NON) {
                badtype = "none";
        } else if (vn.v_type == VBAD) {
                badtype = "bad";
        } else {
                switch (vn.v_tag) {
                case VT_HAMMER:
                        if (!hammer_filestat(&vn, &fst))
                                badtype = "error";
                        break;
                case VT_HAMMER2:
                        if (!hammer2_filestat(&vn, &fst))
                                badtype = "error";
                        break;
                case VT_TMPFS:
                        if (!tmpfs_filestat(&vn, &fst))
                                badtype = "error";
                        break;
                case VT_UFS:
                        if (!ufs_filestat(&vn, &fst))
                                badtype = "error";
                        break;
                case VT_MFS:
                        if (!ufs_filestat(&vn, &fst))
                                badtype = "error";
                        break;
                case VT_NFS:
                        if (!nfs_filestat(&vn, &fst))
                                badtype = "error";
                        break;
                case VT_NTFS:
                        if (!ntfs_filestat(&vn, &fst))
                                badtype = "error";
                        break;
                case VT_EXT2FS:
                        if (!ext2fs_filestat(&vn, &fst))
                                badtype = "error";
                        break;

                case VT_MSDOSFS:
                        if (!msdosfs_filestat(&vn, &fst))
                                badtype = "error";
                        break;

                case VT_ISOFS:
                        if (!isofs_filestat(&vn, &fst))
                                badtype = "error";
                        break;

                case VT_DEVFS:
                        if (!devfs_filestat(&vn, &fst))
                                badtype = "error";
                        break;

                default:
                        {
                                static char unknown[10];

                                sprintf(unknown, "?(%x)", vn.v_tag);
                                badtype = unknown;
                                break;
                        }
                }
        }
        if (checkfile) {
                int fsmatch = 0;
                DEVS *d;

                if (badtype)
                        return;
                for (d = devs; d != NULL; d = d->next)
                        if (d->fsid == fst.fsid) {
                                fsmatch = 1;
                                if (d->ino == (ino_t)fst.fileid) {
                                        filename = d->name;
                                        break;
                                }
                        }
                if (fsmatch == 0 || (filename == NULL && fsflg == 0))
                        return;
        }
        PREFIX(i);

        /*
         * Retrieve variable-length file path and try to make
         * indentation human-readable.
         */
        if (badtype) {
                asprintf(&name, "%s",
                         getmnton(vn.v_mount, &vn.v_namecache, ncr));
        } else if (nflg) {
                asprintf(&name, "%3u,%-9u",
                         major(fst.fsid), minor(fst.fsid));
        } else {
                asprintf(&name, "%s",
                         getmnton(vn.v_mount, &vn.v_namecache, ncr));
        }
        len = (int)strlen(name);

        /*
         * Nominal extra-space indented in multiples of 4
         */
        extra_space = wflg_mnt - len;
        if (extra_space < 0)
                extra_space = 4 - -extra_space % 4;

        if (len + extra_space < last_name_width)
                extra_space = last_name_width - len;
        last_name_width = len + extra_space;

        printf(" %s%*.*s ", name, extra_space, extra_space, "");
        free(name);
        name = NULL;

        /*
         * Remaining sections
         */
        if (badtype) {
                printf("%10s    %8s:%jd\n",
                       badtype, "offset", (intmax_t)off);
                return;
        }

        if (nflg) {
                sprintf(mode, "%06o", fst.mode);
                printf("%*ld %s", ino_width, fst.fileid, mode);
        } else {
                strmode(fst.mode, mode);
                printf("%*ld %10s", ino_width, fst.fileid, mode);
        }

        switch (vn.v_type) {
        case VBLK:
        case VCHR:
                if (nflg ||
                    ((name = devname(fst.rdev, vn.v_type == VCHR ?
                                      S_IFCHR : S_IFBLK)) == NULL)) {
                        printf(" %3u,%-4u", major(fst.rdev), minor(fst.rdev));
                } else {
                        printf(" %8s", name);
                }
                printf(":%jd", (intmax_t)fst.offset);
                break;
        case VREG:
                printf(" %8s:%ju", "offset", (intmax_t)fst.offset);
                break;
        default:
                printf(" %8s:%ju", "offset", (uintmax_t)fst.size);
        }
        rw[0] = '\0';
        if (flag & FREAD)
                strcat(rw, "r");
        if (flag & FWRITE)
                strcat(rw, "w");
        printf(" %2s", rw);
        if (filename && !fsflg)
                printf("  %s", filename);
        putchar('\n');
}

static int
ufs_filestat(struct vnode *vp, struct filestat *fsp)
{
        struct inode inode;

        if (!kread(VTOI(vp), &inode, sizeof (inode))) {
                dprintf(stderr, "can't read inode at %p for pid %d\n",
                    (void *)VTOI(vp), Pid);
                return 0;
        }
        /*
         * The st_dev from stat(2) is a dev_t. These kernel structures
         * contain cdev_t structures. We need to convert to udev to make
         * comparisons
         */
        fsp->fsid = fstat_dev2udev(inode.i_dev);
        fsp->fileid = (long)inode.i_number;
        fsp->mode = (mode_t)inode.i_mode;
        fsp->size = inode.i_size;
        fsp->rdev = inode.i_rdev;

        return 1;
}

static int
nfs_filestat(struct vnode *vp, struct filestat *fsp)
{
        struct nfsnode nfsnode;

        if (!kread(VTONFS(vp), &nfsnode, sizeof (nfsnode))) {
                dprintf(stderr, "can't read nfsnode at %p for pid %d\n",
                    (void *)VTONFS(vp), Pid);
                return 0;
        }
        fsp->fsid = nfsnode.n_vattr.va_fsid;
        fsp->fileid = nfsnode.n_vattr.va_fileid;
        fsp->size = nfsnode.n_size;
        fsp->rdev = makeudev(nfsnode.n_vattr.va_rmajor,
                             nfsnode.n_vattr.va_rminor);
        fsp->mode = nfsnode.n_vattr.va_mode | mtrans(vp->v_type);

        return 1;
}

static int
devfs_filestat(struct vnode *vp, struct filestat *fsp)
{
        struct devfs_node devfs_node;

        if (!kread(vp->v_data, &devfs_node, sizeof (devfs_node))) {
                dprintf(stderr, "can't read devfs_node at %p for pid %d\n",
                    (void *)vp->v_data, Pid);
                return 0;
        }
        fsp->fsid = fsp->rdev = fstat_dev2udev(vp->v_rdev);
        fsp->fileid = devfs_node.d_dir.d_ino;
        fsp->mode = (devfs_node.mode & ~S_IFMT) | S_IFCHR;
        fsp->size = 0;

        return 1;
}

static char *
getmnton(struct mount *m, struct namecache_list *ncplist, struct nchandle *ncr)
{
        static struct mount mount_l;
        static struct mtab {
                struct mtab *next;
                struct mount *m;
                char mntonname[MNAMELEN];
        } *mhead = NULL;
        struct mtab *mt;
        struct namecache *ncp;
        struct namecache ncp_copy;
        static char path[1024];
        int i;

        /*
         * If no ncp is passed try to find one via ncplist.  Make sure
         * we are using the correct mount pointer or the matching code
         * will not know how to transition mount points properly.
         */
        if (ncr == NULL || ncr->ncp == NULL) {
                ncp = ncplist->tqh_first;
        } else {
                ncp = ncr->ncp;
                if (ncr->mount)
                        m = ncr->mount;
        }

        /*
         * If we have an ncp, traceback the path.  This is a kvm pointer.
         */
        if (ncp) {
                if (!kread(m, &mount_l, sizeof(struct mount))) {
                        warnx("can't read mount table at %p", (void *)m);
                        return (NULL);
                }
                i = sizeof(path) - 1;
                path[i] = 0;
                while (ncp) {
                        /*
                         * If this is the root of the mount then traverse
                         * to the parent mount.
                         */
                        if (ncp == mount_l.mnt_ncmountpt.ncp) {
                                ncp = mount_l.mnt_ncmounton.ncp;
                                if (ncp == NULL)
                                        break;
                                m = mount_l.mnt_ncmounton.mount;
                                if (!kread(m, &mount_l, sizeof(struct mount))) {
                                        warnx("can't read mount table at %p", (void *)m);
                                        return (NULL);
                                }
                        }

                        /*
                         * Ok, pull out the ncp and extract the name
                         */
                        if (!kread(ncp, &ncp_copy, sizeof(ncp_copy))) {
                                warnx("can't read ncp at %p", ncp);
                                return (NULL);
                        }
                        if (i <= ncp_copy.nc_nlen)
                                break;
                        i -= ncp_copy.nc_nlen;
                        if (!kread(ncp_copy.nc_name, path + i, ncp_copy.nc_nlen)) {
                                warnx("can't read ncp %p path component at %p", ncp, ncp_copy.nc_name);
                                return (NULL);
                        }
                        make_printable(path + i, ncp_copy.nc_nlen);
                        path[--i] = '/';
                        ncp = ncp_copy.nc_parent;
                }
                if (i == sizeof(path) - 1)
                        path[--i] = '/';
                return(path + i);
        }

        /*
         * If all else fails print out the mount point path
         */
        for (mt = mhead; mt != NULL; mt = mt->next) {
                if (m == mt->m)
                        return (mt->mntonname);
        }
        if (!kread(m, &mount_l, sizeof(struct mount))) {
                warnx("can't read mount table at %p", (void *)m);
                return (NULL);
        }
        if ((mt = malloc(sizeof (struct mtab))) == NULL)
                err(1, NULL);
        mt->m = m;
        bcopy(&mount_l.mnt_stat.f_mntonname[0], &mt->mntonname[0], MNAMELEN);
        mt->next = mhead;
        mhead = mt;
        return (mt->mntonname);
}

static void
pipetrans(struct pipe *pi, int i, int flag)
{
        struct pipe pip;
        struct pipebuf *b1;
        struct pipebuf *b2;
        char rw[3];
        char side1;
        char side2;

        PREFIX(i);
        if ((intptr_t)pi & 1) {
                side1 = 'B';
                side2 = 'A';
                b1 = &pip.bufferB;
                b2 = &pip.bufferA;
        } else {
                side1 = 'A';
                side2 = 'B';
                b1 = &pip.bufferA;
                b2 = &pip.bufferB;
        }
        pi = (void *)((intptr_t)pi & ~(intptr_t)1);

        /* fill in socket */
        if (!kread(pi, &pip, sizeof(struct pipe))) {
                dprintf(stderr, "can't read pipe at %p\n", (void *)pi);
                goto bad;
        }

        printf("* pipe %8lx (%c<->%c)", (u_long)pi, side1, side2);
        printf(" ravail %-zu wavail %-zu",
               b1->windex - b1->rindex,
               b2->windex - b2->rindex);
        rw[0] = '\0';
        if (flag & FREAD)
                strcat(rw, "r");
        if (flag & FWRITE)
                strcat(rw, "w");
        printf(" %2s", rw);
        putchar('\n');
        return;

bad:
        printf("* error\n");
}

static void
socktrans(struct socket *sock, int i)
{
        static const char *stypename[] = {
                "unused",       /* 0 */
                "stream",       /* 1 */
                "dgram ",       /* 2 */
                "raw   ",       /* 3 */
                "rdm   ",       /* 4 */
                "seqpak"        /* 5 */
        };
#define STYPEMAX 5
        struct socket   so;
        struct protosw  proto;
        struct domain   dom;
        struct inpcb    inpcb;
        struct unpcb    unpcb;
        int len;
        char dname[32];

        PREFIX(i);

        /* fill in socket */
        if (!kread(sock, &so, sizeof(struct socket))) {
                dprintf(stderr, "can't read sock at %p\n", (void *)sock);
                goto bad;
        }

        /* fill in protosw entry */
        if (!kread(so.so_proto, &proto, sizeof(struct protosw))) {
                dprintf(stderr, "can't read protosw at %p",
                    (void *)so.so_proto);
                goto bad;
        }

        /* fill in domain */
        if (!kread(proto.pr_domain, &dom, sizeof(struct domain))) {
                dprintf(stderr, "can't read domain at %p\n",
                    (const void *)proto.pr_domain);
                goto bad;
        }

        if ((len = kvm_read(kd, (u_long)dom.dom_name, dname,
            sizeof(dname) - 1)) < 0) {
                dprintf(stderr, "can't read domain name at %p\n",
                    (void *)dom.dom_name);
                dname[0] = '\0';
        }
        else
                dname[len] = '\0';

        if ((u_short)so.so_type > STYPEMAX)
                printf("* %-9s ?%d", dname, so.so_type);
        else
                printf("* %-9s %s", dname, stypename[so.so_type]);

        /*
         * protocol specific formatting
         *
         * Try to find interesting things to print.  For tcp, the interesting
         * thing is the address of the tcpcb, for udp and others, just the
         * inpcb (socket pcb).  For unix domain, its the address of the socket
         * pcb and the address of the connected pcb (if connected).  Otherwise
         * just print the protocol number and address of the socket itself.
         * The idea is not to duplicate netstat, but to make available enough
         * information for further analysis.
         */
        switch(dom.dom_family) {
        case AF_INET:
        case AF_INET6:
                getinetproto(proto.pr_protocol);
                if (proto.pr_protocol == IPPROTO_TCP ) {
                        if (so.so_pcb) {
                                if (kvm_read(kd, (u_long)so.so_pcb,
                                    (char *)&inpcb, sizeof(struct inpcb))
                                    != sizeof(struct inpcb)) {
                                        dprintf(stderr,
                                            "can't read inpcb at %p\n",
                                            (void *)so.so_pcb);
                                        goto bad;
                                }
                                printf(" %lx", (u_long)inpcb.inp_ppcb);
                        }
                }
                else if (so.so_pcb)
                        printf(" %lx", (u_long)so.so_pcb);
                break;
        case AF_UNIX:
                /* print address of pcb and connected pcb */
                if (so.so_pcb) {
                        printf(" %lx", (u_long)so.so_pcb);
                        if (kvm_read(kd, (u_long)so.so_pcb, (char *)&unpcb,
                            sizeof(struct unpcb)) != sizeof(struct unpcb)){
                                dprintf(stderr, "can't read unpcb at %p\n",
                                    (void *)so.so_pcb);
                                goto bad;
                        }
                        if (unpcb.unp_conn) {
                                char shoconn[4], *cp;

                                cp = shoconn;
                                if (!(so.so_state & SS_CANTRCVMORE))
                                        *cp++ = '<';
                                *cp++ = '-';
                                if (!(so.so_state & SS_CANTSENDMORE))
                                        *cp++ = '>';
                                *cp = '\0';
                                printf(" %s %lx", shoconn,
                                    (u_long)unpcb.unp_conn);
                        }
                }
                break;
        default:
                /* print protocol number and socket address */
                printf(" %d %lx", proto.pr_protocol, (u_long)sock);
        }
        printf("\n");
        return;
bad:
        printf("* error\n");
}


/*
 * Read the cdev structure in the kernel (as pointed to by a cdev_t)
 * in order to work out the associated dev_t
 */
dev_t
fstat_dev2udev(cdev_t dev)
{
        struct cdev si;

        if (kread(dev, &si, sizeof si)) {
                if ((si.si_umajor & 0xffffff00) ||
                    (si.si_uminor & 0x0000ff00)) {
                        return NOUDEV;
                }
                return((si.si_umajor << 8) | si.si_uminor);
        } else {
                dprintf(stderr, "can't convert cdev_t %p to a dev_t\n", dev);
                return NOUDEV;
        }
}

dev_t
makeudev(int x, int y)
{
        if ((x & 0xffffff00) || (y & 0x0000ff00))
                return NOUDEV;
        return ((x << 8) | y);
}

/*
 * getinetproto --
 *      print name of protocol number
 */
static void
getinetproto(int number)
{
        static int isopen;
        struct protoent *pe;

        if (!isopen)
                setprotoent(++isopen);
        if ((pe = getprotobynumber(number)) != NULL)
                printf(" %s", pe->p_name);
        else
                printf(" %d", number);
}

static int
getfname(const char *filename)
{
        struct stat statbuf;
        DEVS *cur;

        if (stat(filename, &statbuf)) {
                warn("%s", filename);
                return(0);
        }
        if ((cur = malloc(sizeof(DEVS))) == NULL)
                err(1, NULL);
        cur->next = devs;
        devs = cur;

        cur->ino = statbuf.st_ino;
        cur->fsid = statbuf.st_dev;
        cur->name = filename;
        return(1);
}

static void
usage(void)
{
        (void)fprintf(stderr,
 "usage: fstat [-fmnv] [-p pid] [-u user] [-N system] [-M core] [file ...]\n");
        exit(1);
}

static 
void
make_printable(char *buf, int len)
{
    while (len > 0) {
        if (!isprint(*buf)) 
                *buf = '?';
        ++buf;
        --len;
    }
}

ssize_t
kread(const void *kaddr, void *uaddr, size_t nbytes)
{
    if (nbytes > 0x10000000)
        return(0);

    if (kvm_read(kd, (u_long)kaddr, (char *)uaddr, nbytes) == (ssize_t)nbytes)
        return(1);
    else
        return(0);
}