vi/port/expreserve.c

	expreserve.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2000-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


/* Copyright (c) 1981 Regents of the University of California */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <errno.h>
#include <dirent.h>
#include <pwd.h>
#include <locale.h>
#include <limits.h>

#define BUFSIZE (LINE_MAX*2)    /* This should agree with what's in ex.h */

#include "ex_tune.h"

#define FTYPE(A)    (A.st_mode)
#define FMODE(A)    (A.st_mode)
#define IDENTICAL(A, B) (A.st_dev == B.st_dev && A.st_ino == B.st_ino)
#define ISBLK(A)    ((A.st_mode & S_IFMT) == S_IFBLK)
#define ISCHR(A)    ((A.st_mode & S_IFMT) == S_IFCHR)
#define ISDIR(A)    ((A.st_mode & S_IFMT) == S_IFDIR)
#define ISFIFO(A)   ((A.st_mode & S_IFMT) == S_IFIFO)
#define ISREG(A)    ((A.st_mode & S_IFMT) == S_IFREG)

/*
 * Expreserve - preserve a file in usrpath(preserve)
 *
 * This routine is very naive - it doesn't remove anything from
 * usrpath(preserve)... this may mean that we  * stuff there...
 * the danger in doing anything with usrpath(preserve)
 * is that the clock may be messed up and we may get confused.
 *
 * We are called in two ways - first from the editor with no arguments
 * and the standard input open on the temp file. Second with an argument
 * to preserve the entire contents of /var/tmp (root only).
 *
 * BUG: should do something about preserving Rx... (register contents)
 *      temporaries.
 */

struct  header {
    time_t  Time;           /* Time temp file last updated */
    int Uid;            /* This user's identity */
#ifndef VMUNIX
    short   Flines;         /* Number of lines in file */
#else
    int Flines;
#endif
    unsigned char   Savedfile[FNSIZE];  /* The current file name */
    short   Blocks[LBLKS];      /* Blocks where line pointers stashed */
    short   encrypted;      /* Encrypted temp file flag */
} H;

struct  passwd *getpwuid();
off_t   lseek();
FILE    *popen();
void exit(), perror();
#define eq(a, b) strcmp(a, b) == 0

main(argc)
    int argc;
{
    register DIR *tf;
    struct dirent64 *direntry;
    unsigned char *filname;
    struct stat64 stbuf;

    (void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
    (void) textdomain(TEXT_DOMAIN);
    /*
     * If only one argument, then preserve the standard input.
     */
    if (argc == 1) {
        if (copyout((char *) 0))
            exit(1);
        exit(0);
    }

    /*
     * If not super user, then can only preserve standard input.
     */
    if (getuid()) {
        fprintf(stderr, gettext("NOT super user\n"));
        exit(1);
    }

    /*
     * ... else preserve all the stuff in /var/tmp, removing
     * it as we go.
     */
    if (chdir(TMPDIR) < 0) {
        perror(TMPDIR);
        exit(1);
    }

    if ((tf = opendir(".")) == NULL)
    {
        perror(TMPDIR);
        exit(1);
    }
    while ((direntry = readdir64(tf)) != NULL)
    {
        filname = (unsigned char *)direntry->d_name;
        /*
         * Ex temporaries must begin with Ex;
         * we check that the 12th character of the name is null
         * so we won't have to worry about non-null terminated names
         * later on.
         */
        if (filname[0] != 'E' || filname[1] != 'x' || filname[12])
            continue;
        if (stat64((char *)filname, &stbuf))
            continue;
        if (!ISREG(stbuf))
            continue;
        /*
         * Save the file.
         */
        (void) copyout(filname);
    }
    closedir(tf);
    exit(0);
}

unsigned char   mydir[] =   USRPRESERVE;
unsigned char   pattern[] = "/Exaa`XXXXXXXXXX";

/*
 * Copy file name into usrpath(preserve)/...
 * If name is (char *) 0, then do the standard input.
 * We make some checks on the input to make sure it is
 * really an editor temporary, generate a name for the
 * file (this is the slowest thing since we must stat
 * to find a unique name), and finally copy the file.
 */
copyout(name)
    unsigned char *name;
{
    int i;
    static int reenter;
    unsigned char buf[BUFSIZE];
    unsigned char   savdir[PATH_MAX+1];
    unsigned char   savfil[PATH_MAX+1];
    struct passwd *pp;
    struct stat64   stbuf;
    int savfild;

    /*
     * The first time we put in the digits of our
     * process number at the end of the pattern.
     */
    if (reenter == 0) {
        mkdigits(pattern);
        reenter++;
    }

    /*
     * If a file name was given, make it the standard
     * input if possible.
     */
    if (name != 0) {
        (void) close(0);
        /*
         * Need read/write access for arcane reasons
         * (see below).
         */
        if (open(name, O_RDWR) < 0)
            return (-1);
    }

    /*
     * Get the header block.
     */
    (void) lseek(0, 0l, 0);
    if (read(0, (char *)&H, sizeof (H)) != sizeof (H)) {
format:
        if (name == 0)
            fprintf(stderr, gettext("Buffer format error\t"));
        else {
            /*
             * avoid having a bunch of NULL Ex* files
             * hanging around
             */
            struct stat64 stbuf;

            if (stat64((char *)name, &stbuf) == 0)
            if (stbuf.st_size == 0)
                (void) unlink(name);
        }
        return (-1);
    }

    /*
     * Consistency checks so we don't copy out garbage.
     */
    if (H.Flines < 0) {
#ifdef DEBUG
        fprintf(stderr, "Negative number of lines\n");
#endif
        goto format;
    }
    if (H.Blocks[0] != HBLKS || H.Blocks[1] != HBLKS+1) {
#ifdef DEBUG
        fprintf(stderr, "Blocks %d %d\n", H.Blocks[0], H.Blocks[1]);
#endif
        goto format;
    }
    if (name == 0 && H.Uid != getuid()) {
#ifdef DEBUG
        fprintf(stderr, "Wrong user-id\n");
#endif
        goto format;
    }
    if (lseek(0, 0l, 0)) {
#ifdef DEBUG
        fprintf(stderr, gettext("Negative number of lines\n"));
#endif
        goto format;
    }

    /*
     * If no name was assigned to the file, then give it the name
     * LOST, by putting this in the header.
     */
    if (H.Savedfile[0] == 0) {
        (void) strcpy(H.Savedfile, "LOST");
        (void) write(0, (char *) &H, sizeof (H));
        H.Savedfile[0] = 0;
        (void) lseek(0, 0l, 0);
    }

    /*
     * See if preservation directory for user exists.
     */

    strcpy(savdir, mydir);
    pp = getpwuid(H.Uid);
    if (pp)
        strcat(savdir, pp->pw_name);
    else {
        fprintf(stderr, gettext("Unable to get uid for user.\n"));
        return (-1);
    }
    if (lstat64((char *)savdir, &stbuf) < 0 || !S_ISDIR(stbuf.st_mode)) {
        /* It doesn't exist or it isn't a directory, safe to unlink */
        (void) unlink(savdir);
        if (mkdir((char *)savdir, 0700) < 0) {
            fprintf(stderr,
                gettext("Unable to create directory \"%s\"\n"),
                savdir);
            perror("");
            return (-1);
        }
        (void) chmod((char *)savdir, 0700);
        (void) chown(savdir, H.Uid, 2);
    }

    /*
     * File is good.  Get a name and create a file for the copy.
     */
    (void) close(1);
    if ((savfild = mknext(savdir, pattern)) < 0) {
        if (name == 0)
            perror((char *)savfil);
        return  (1);
    }
    strcpy(savfil, savdir);
    strcat(savfil, pattern);
    /*
     * Make target owned by user.
     */

    (void) fchown(savfild, H.Uid, 2);

    /*
     * Copy the file.
     */
    for (;;) {
        i = read(0, buf, BUFSIZE);
        if (i < 0) {
            if (name)
                perror(gettext("Buffer read error"));
            (void) unlink(savfil);
            return (-1);
        }
        if (i == 0) {
            if (name)
                (void) unlink(name);
            notify(H.Uid, H.Savedfile, (int) name, H.encrypted);
            return (0);
        }
        if (write(savfild, buf, i) != i) {
            if (name == 0)
                perror((char *)savfil);
            (void) unlink(savfil);
            return (-1);
        }
    }
}

/*
 * Blast the last 5 characters of cp to be the process number.
 */
mkdigits(cp)
    unsigned char *cp;
{
    register pid_t i;
    register int j;

    for (i = getpid(), j = 10, cp += strlen(cp); j > 0; i /= 10, j--)
        *--cp = i % 10 | '0';
}

/*
 * Make the name in cp be unique by clobbering up to
 * three alphabetic characters into a sequence of the form 'aab', 'aac', etc.
 * Mktemp gets weird names too quickly to be useful here.
 */
mknext(dir, cp)
    unsigned char *dir;
    unsigned char *cp;
{
    unsigned char *dcp;
    struct stat stb;
    unsigned char path[PATH_MAX+1];
    int fd;

    strcpy(path, dir);
    strcat(path, cp);
    dcp = path + strlen(path) - 1;

    while (isdigit(*dcp))
        dcp--;

    do {
        if (dcp[0] == 'z') {
            dcp[0] = 'a';
            if (dcp[-1] == 'z') {
                dcp[-1] = 'a';
                if (dcp[-2] == 'z') {
                    fprintf(stderr,
                        gettext("Can't find a name\t"));
                        return (-1);
                }
                dcp[-2]++;
            } else
                dcp[-1]++;
        } else
            dcp[0]++;

    } while (((fd = open(path, O_CREAT|O_EXCL|O_WRONLY, 0600)) < 0) &&
        errno == EEXIST);
    /* copy out patern */
    strcpy(cp, path + strlen(dir));
    return (fd);
}

/*
 * Notify user uid that his file fname has been saved.
 */
notify(uid, fname, flag, cryflag)
    int uid;
    unsigned char *fname;
{

#define MAXHOSTNAMELEN 256

    struct passwd *pp = getpwuid(uid);
    register FILE *mf;
    unsigned char cmd[BUFSIZE];

    char hostname[MAXHOSTNAMELEN];
    int namelen = MAXHOSTNAMELEN ;

    if (gethostname((char *)hostname, namelen) == -1)
      return;

    if (pp == NULL)
        return;
    sprintf((char *)cmd, "/usr/bin/mail %s", pp->pw_name);
    mf = popen((char *)cmd, "w");
    if (mf == NULL)
        return;
    setbuf(mf, (char *)cmd);
    if (fname[0] == 0) {
        fprintf(mf, flag ?
"A copy of an editor buffer of yours was saved on %s when the system went down.\n" :
"A copy of an editor buffer of yours was saved on %s when the editor was killed\nor was unable to save your changes.\n", hostname);
        fprintf(mf,
"No name was associated with this buffer so it has been named \"LOST\".\n");
    } else
        fprintf(mf, flag ?
"A copy of an editor buffer of your file \"%s\"%s was saved on %s\nwhen the system \
went down.\n" :
"A copy of an editor buffer of your file \"%s\"%s was saved on %s\nwhen the editor \
was killed or was unable to save your changes.\n", fname, (cryflag) ? "[ENCRYPTED]" : "", hostname);
        /*
         * "the editor was killed" is perhaps still not an ideal
         * error message.  Usually, either it was forceably terminated
         * or the phone was hung up, but we don't know which.
         */
    fprintf(mf,
"This buffer can be retrieved using the \"recover\" command of the editor.\n");
    fprintf(mf,
"An easy way to do this is to give the command \"vi -r %s\".\n",
        (fname[0] == 0) ? "LOST" : (char *) fname);
    fprintf(mf, "This works for \"edit\" and \"ex\" also.\n");
    (void) pclose(mf);
}