usr/src/cmd/fm/eversholt/common/eftread.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  *
  25  * eftread.c -- routines for reading .eft files
  26  *
  27  */
  28
  29 #pragma ident   "%Z%%M% %I%     %E% SMI"
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <strings.h>
  34 #include <time.h>
  35 #include <unistd.h>
  36 #include <errno.h>
  37 #include <stdlib.h>
  38 #include <alloca.h>
  39 #include "out.h"
  40 #include "stable.h"
  41 #include "lut.h"
  42 #include "tree.h"
  43 #include "eft.h"
  44 #include "eftread.h"
  45 #include "esclex.h"
  46 #include "version.h"
  47 #include "ptree.h"
  48
  49 /* for uintX_t, htonl(), etc */
  50 #include <sys/types.h>
  51 #include <netinet/in.h>
  52 #include <inttypes.h>
  53
  54 #ifndef MIN
  55 #define MIN(x, y) ((x) <= (y) ? (x) : (y))
  56 #endif
  57
  58 static int Showheader;
  59
  60 /*
  61  * eftread_showheader -- set showheader flag
  62  *
  63  */
  64 void
  65 eftread_showheader(int newval)
  66 {
  67         Showheader = newval;
  68 }
  69
  70 /*
  71  * eftread_fopen -- fopen an EFT file for reading
  72  *
  73  */
  74
  75 FILE *
  76 eftread_fopen(const char *fname, char *idbuf, size_t idbufsz)
  77 {
  78         FILE *fp;
  79         FILE *tfp;
  80         struct eftheader hdr;
  81 #define BUFLEN  8192
  82         char buf[BUFLEN];
  83         int cc;
  84         uint32_t csum = 0;
  85         char *ptr;
  86
  87         if ((ptr = strrchr(fname, '.')) == NULL || strcmp(ptr, ".eft") != 0) {
  88                 out(O_ERR, "%s: not a valid EFT (bad extension)", fname);
  89                 return (NULL);
  90         }
  91
  92         if ((fp = fopen(fname, "r")) == NULL) {
  93                 out(O_ERR|O_SYS, "%s", fname);
  94                 return (NULL);
  95         }
  96
  97         if (fread(&hdr, 1, sizeof (hdr), fp) < sizeof (hdr)) {
  98                 (void) fclose(fp);
  99                 out(O_ERR, "%s: not a valid EFT (too short)", fname);
 100                 return (NULL);
 101         }
 102         hdr.magic = ntohl(hdr.magic);
 103         hdr.major = ntohs(hdr.major);
 104         hdr.minor = ntohs(hdr.minor);
 105         hdr.cmajor = ntohs(hdr.cmajor);
 106         hdr.cminor = ntohs(hdr.cminor);
 107         hdr.identlen = ntohl(hdr.identlen);
 108         hdr.dictlen = ntohl(hdr.dictlen);
 109         hdr.csum = ntohl(hdr.csum);
 110
 111         if (Showheader)
 112                 out(O_VERB, "%s: magic %x EFT version %d.%d esc version %d.%d",
 113                     fname, hdr.magic, hdr.major, hdr.minor,
 114                     hdr.cmajor, hdr.cminor);
 115
 116         if (hdr.magic != EFT_HDR_MAGIC) {
 117                 (void) fclose(fp);
 118                 out(O_ERR, "%s: not a valid EFT (bad magic)", fname);
 119                 return (NULL);
 120         }
 121
 122         if (hdr.major != EFT_HDR_MAJOR || hdr.minor > EFT_HDR_MINOR) {
 123                 (void) fclose(fp);
 124                 out(O_ERR, "%s is version %d.%d, "
 125                     "this program supports up to %d.%d", fname,
 126                     hdr.major, hdr.minor, EFT_HDR_MAJOR, EFT_HDR_MINOR);
 127                 return (NULL);
 128         }
 129
 130         bzero(idbuf, idbufsz);
 131         if (hdr.identlen != 0) {
 132                 long npos = ftell(fp) + (long)hdr.identlen; /* after ident */
 133                 size_t rsz = MIN(hdr.identlen, idbufsz - 1);
 134
 135                 if (fread(idbuf, 1, rsz, fp) != rsz)
 136                         out(O_DIE|O_SYS, "%s: fread", fname);
 137                 if (fseek(fp, npos, SEEK_SET) == -1)
 138                         out(O_DIE|O_SYS, "%s: fseek", fname);
 139         }
 140
 141         if (hdr.dictlen && (hdr.dictlen < 2 || hdr.dictlen > 1000)) {
 142                 (void) fclose(fp);
 143                 out(O_ERR, "%s: bad dictlen: %d", fname, hdr.dictlen);
 144                 return (NULL);
 145         }
 146
 147         /* read in dict strings */
 148         if (hdr.dictlen) {
 149                 char *dbuf = alloca(hdr.dictlen);
 150                 char *dptr;
 151
 152                 if ((cc = fread(dbuf, 1, hdr.dictlen, fp)) != hdr.dictlen)
 153                         out(O_DIE|O_SYS, "short fread on %s (dictlen %d)",
 154                             fname, hdr.dictlen);
 155
 156                 /* work from end of string array backwards, finding names */
 157                 for (dptr = &dbuf[hdr.dictlen - 2]; dptr > dbuf; dptr--)
 158                         if (*dptr == '\0') {
 159                                 /* found separator, record string */
 160                                 Dicts = lut_add(Dicts,
 161                                     (void *)stable(dptr + 1), NULL, NULL);
 162                         }
 163                 /* record the first string */
 164                 Dicts = lut_add(Dicts,
 165                     (void *)stable(dptr), NULL, NULL);
 166         }
 167
 168         if ((tfp = tmpfile()) == NULL)
 169                 out(O_DIE|O_SYS, "cannot create temporary file");
 170
 171         while ((cc = fread(buf, 1, BUFLEN, fp)) > 0) {
 172                 char *ptr;
 173
 174                 for (ptr = buf; ptr < &buf[cc]; ptr++) {
 175                         *ptr = ~((unsigned char)*ptr);
 176                         csum += (uint32_t)*ptr;
 177                 }
 178                 if (cc != fwrite(buf, 1, cc, tfp) || ferror(tfp))
 179                         out(O_DIE|O_SYS, "fwrite on tmpfile");
 180         }
 181         if (ferror(fp))
 182                 out(O_DIE|O_SYS, "fread on %s", fname);
 183         (void) fclose(fp);
 184
 185         if (hdr.csum != csum) {
 186                 out(O_ERR, "%s: bad checksum (%x != %x)", fname,
 187                     hdr.csum, csum);
 188                 (void) fclose(tfp);
 189                 return (NULL);
 190         }
 191
 192         if (Showheader) {
 193                 int len = strlen(hdr.comment);
 194                 if (len > 0 && hdr.comment[len - 1] == '\n')
 195                         hdr.comment[len - 1] = '\0';
 196                 out(O_OK, "%s:\n\t%s", fname, hdr.comment);
 197         }
 198
 199         rewind(tfp);
 200
 201         return (tfp);
 202 }