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spec.c

/**   $MirOS: src/usr.sbin/mtree/spec.c,v 1.2 2005/04/13 20:30:16 tg Exp $ */
/*    $NetBSD: spec.c,v 1.6 1995/03/07 21:12:12 cgd Exp $   */
/*    $OpenBSD: spec.c,v 1.22 2004/08/01 18:32:20 deraadt Exp $   */

/*-
 * Copyright (c) 1989, 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.
 */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)spec.c  8.1 (Berkeley) 6/6/93";
#else
static const char rcsid[] = "$OpenBSD: spec.c,v 1.22 2004/08/01 18:32:20 deraadt Exp $";
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <vis.h>
#include "mtree.h"
#include "extern.h"

int lineno;                   /* Current spec line number. */

static void  set(char *, NODE *);
static void  unset(char *, NODE *);

NODE *
spec(void)
{
      NODE *centry, *last;
      char *p;
      NODE ginfo, *root;
      int c_cur, c_next;
      char buf[2048];
      size_t len;

      centry = last = root = NULL;
      bzero(&ginfo, sizeof(ginfo));
      c_cur = c_next = 0;
      for (lineno = 1; fgets(buf, sizeof(buf), stdin);
          ++lineno, c_cur = c_next, c_next = 0) {
            /* Skip empty lines. */
            if (buf[0] == '\n')
                  continue;

            /* Find end of line. */
            if ((p = strchr(buf, '\n')) == NULL)
                  error("line %d too long", lineno);

            /* See if next line is continuation line. */
            if (p[-1] == '\\') {
                  --p;
                  c_next = 1;
            }

            /* Null-terminate the line. */
            *p = '\0';

            /* Skip leading whitespace. */
            for (p = buf; *p && isspace(*p); ++p);

            /* If nothing but whitespace or comment char, continue. */
            if (!*p || *p == '#')
                  continue;

#ifdef DEBUG
            (void)fprintf(stderr, "line %d: {%s}\n", lineno, p);
#endif
            if (c_cur) {
                  set(p, centry);
                  continue;
            }

            /* Grab file name, "$", "set", or "unset". */
            if ((p = strtok(p, "\n\t ")) == NULL)
                  error("missing field");

            if (p[0] == '/')
                  switch(p[1]) {
                  case 's':
                        if (strcmp(p + 1, "set"))
                              break;
                        set(NULL, &ginfo);
                        continue;
                  case 'u':
                        if (strcmp(p + 1, "unset"))
                              break;
                        unset(NULL, &ginfo);
                        continue;
                  }

            if (strchr(p, '/'))
                  error("slash character in file name");

            if (!strcmp(p, "..")) {
                  /* Don't go up, if haven't gone down. */
                  if (!root)
                        goto noparent;
                  if (last->type != F_DIR || last->flags & F_DONE) {
                        if (last == root)
                              goto noparent;
                        last = last->parent;
                  }
                  last->flags |= F_DONE;
                  continue;

noparent:         error("no parent node");
            }

            len = strlen(p) + 1;    /* NUL in struct _node */
            if ((centry = calloc(1, sizeof(NODE) + len - 1)) == NULL)
                  error("%s", strerror(errno));
            *centry = ginfo;
#define     MAGIC "?*["
            if (strpbrk(p, MAGIC))
                  centry->flags |= F_MAGIC;
            if (strunvis(centry->name, p) == -1) {
                  fprintf(stderr,
                      "mtree: filename (%s) encoded incorrectly\n", p);
                  strlcpy(centry->name, p, len);
            }
            set(NULL, centry);

            if (!root) {
                  last = root = centry;
                  root->parent = root;
            } else if (last->type == F_DIR && !(last->flags & F_DONE)) {
                  centry->parent = last;
                  last = last->child = centry;
            } else {
                  centry->parent = last->parent;
                  centry->prev = last;
                  last = last->next = centry;
            }
      }
      return (root);
}

static void
set(char *t, NODE *ip)
{
      int type;
      char *kw, *val = NULL;
      struct group *gr;
      struct passwd *pw;
      void *m;
      int value;
      u_int32_t fset, fclr;
      char *ep;
      size_t len;

      for (; (kw = strtok(t, "= \t\n")); t = NULL) {
            ip->flags |= type = parsekey(kw, &value);
            if (value && (val = strtok(NULL, " \t\n")) == NULL)
                  error("missing value");
            switch(type) {
            case F_CKSUM:
                  ip->cksum = strtoul(val, &ep, 10);
                  if (*ep)
                        error("invalid checksum %s", val);
                  break;
            case F_MD5:
                  ip->md5digest = strdup(val);
                  if (!ip->md5digest)
                        error("%s", strerror(errno));
                  break;
#ifndef __INTERIX
            case F_FLAGS:
                  if (!strcmp(val, "none")) {
                        ip->file_flags = 0;
                        break;
                  }
                  if (strtofflags(&val, &fset, &fclr))
                        error("%s", strerror(errno));
                  ip->file_flags = fset;
                  break;
#endif
            case F_GID:
                  ip->st_gid = strtoul(val, &ep, 10);
                  if (*ep)
                        error("invalid gid %s", val);
                  break;
            case F_GNAME:
                  if ((gr = getgrnam(val)) == NULL)
                      error("unknown group %s", val);
                  ip->st_gid = gr->gr_gid;
                  break;
            case F_IGN:
                  /* just set flag bit */
                  break;
            case F_MODE:
                  if ((m = setmode(val)) == NULL)
                        error("invalid file mode %s", val);
                  ip->st_mode = getmode(m, 0);
                  free(m);
                  break;
            case F_NLINK:
                  ip->st_nlink = strtoul(val, &ep, 10);
                  if (*ep)
                        error("invalid link count %s", val);
                  break;
            case F_RMD160:
                  ip->rmd160digest = strdup(val);
                  if (!ip->rmd160digest)
                        error("%s", strerror(errno));
                  break;
            case F_SHA1:
                  ip->sha1digest = strdup(val);
                  if (!ip->sha1digest)
                        error("%s", strerror(errno));
                  break;
            case F_SIZE:
                  ip->st_size = strtouq(val, &ep, 10);
                  if (*ep)
                        error("invalid size %s", val);
                  break;
            case F_SLINK:
                  len = strlen(val) + 1;
                  if ((ip->slink = malloc(len)) == NULL)
                        error("%s", strerror(errno));
                  if (strunvis(ip->slink, val) == -1) {
                        fprintf(stderr,
                            "mtree: filename (%s) encoded incorrectly\n", val);
                        strlcpy(ip->slink, val, len);
                  }
                  break;
            case F_TIME:
                  ip->st_mtimespec.tv_sec = strtoul(val, &ep, 10);
                  if (*ep != '.')
                        error("invalid time %s", val);
                  val = ep + 1;
                  ip->st_mtimespec.tv_nsec = strtoul(val, &ep, 10);
                  if (*ep)
                        error("invalid time %s", val);
                  break;
            case F_TYPE:
                  switch(*val) {
                  case 'b':
                        if (!strcmp(val, "block"))
                              ip->type = F_BLOCK;
                        break;
                  case 'c':
                        if (!strcmp(val, "char"))
                              ip->type = F_CHAR;
                        break;
                  case 'd':
                        if (!strcmp(val, "dir"))
                              ip->type = F_DIR;
                        break;
                  case 'f':
                        if (!strcmp(val, "file"))
                              ip->type = F_FILE;
                        if (!strcmp(val, "fifo"))
                              ip->type = F_FIFO;
                        break;
                  case 'l':
                        if (!strcmp(val, "link"))
                              ip->type = F_LINK;
                        break;
                  case 's':
                        if (!strcmp(val, "socket"))
                              ip->type = F_SOCK;
                        break;
                  default:
                        error("unknown file type %s", val);
                  }
                  break;
            case F_UID:
                  ip->st_uid = strtoul(val, &ep, 10);
                  if (*ep)
                        error("invalid uid %s", val);
                  break;
            case F_UNAME:
                  if ((pw = getpwnam(val)) == NULL)
                      error("unknown user %s", val);
                  ip->st_uid = pw->pw_uid;
                  break;
            }
      }
}

static void
unset(char *t, NODE *ip)
{
      char *p;

      while ((p = strtok(t, "\n\t ")))
            ip->flags &= ~parsekey(p, NULL);
}

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