libexec/rbootd/parseconf.c

   1 /*
   2  * Copyright (c) 1988, 1992 The University of Utah and the Center
   3  *      for Software Science (CSS).
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * the Center for Software Science of the University of Utah Computer
   9  * Science Department.  CSS requests users of this software to return
  10  * to css-dist@cs.utah.edu any improvements that they make and grant
  11  * CSS redistribution rights.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      from: @(#)parseconf.c   8.1 (Berkeley) 6/4/93
  38  *
  39  * From: Utah Hdr: parseconf.c 3.1 92/07/06
  40  * Author: Jeff Forys, University of Utah CSS
  41  *
  42  * @(#)parseconf.c      8.1 (Berkeley) 6/4/93
  43  * $FreeBSD: src/libexec/rbootd/parseconf.c,v 1.9.2.1 2001/03/05 11:17:52 kris Exp $
  44  */
  45
  46 #include <sys/param.h>
  47 #include <sys/stat.h>
  48 #include <sys/time.h>
  49
  50 #include <ctype.h>
  51 #include <dirent.h>
  52 #include <fcntl.h>
  53 #include <signal.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <syslog.h>
  58 #include "defs.h"
  59
  60 /*
  61 **  ParseConfig -- parse the config file into linked list of clients.
  62 **
  63 **      Parameters:
  64 **              None.
  65 **
  66 **      Returns:
  67 **              1 on success, 0 otherwise.
  68 **
  69 **      Side Effects:
  70 **              - Linked list of clients will be (re)allocated.
  71 **
  72 **      Warnings:
  73 **              - GetBootFiles() must be called before this routine
  74 **                to create a linked list of default boot files.
  75 */
  76 int
  77 ParseConfig(void)
  78 {
  79         FILE *fp;
  80         CLIENT *client;
  81         u_int8_t *addr;
  82         char line[C_LINELEN];
  83         char *cp, *bcp;
  84         int i, j;
  85         int omask, linecnt = 0;
  86
  87         if (BootAny)                            /* ignore config file */
  88                 return(1);
  89
  90         FreeClients();                          /* delete old list of clients */
  91
  92         if ((fp = fopen(ConfigFile, "r")) == NULL) {
  93                 syslog(LOG_ERR, "ParseConfig: can't open config file (%s)",
  94                        ConfigFile);
  95                 return(0);
  96         }
  97
  98         /*
  99          *  We've got to block SIGHUP to prevent reconfiguration while
 100          *  dealing with the linked list of Clients.  This can be done
 101          *  when actually linking the new client into the list, but
 102          *  this could have unexpected results if the server was HUP'd
 103          *  whilst reconfiguring.  Hence, it is done here.
 104          */
 105         omask = sigblock(sigmask(SIGHUP));
 106
 107         /*
 108          *  GETSTR positions `bcp' at the start of the current token,
 109          *  and null terminates it.  `cp' is positioned at the start
 110          *  of the next token.  spaces & commas are separators.
 111          */
 112 #define GETSTR  while (isspace(*cp) || *cp == ',') cp++;        \
 113                 bcp = cp;                                       \
 114                 while (*cp && *cp!=',' && !isspace(*cp)) cp++;  \
 115                 if (*cp) *cp++ = '\0'
 116
 117         /*
 118          *  For each line, parse it into a new CLIENT struct.
 119          */
 120         while (fgets(line, C_LINELEN, fp) != NULL) {
 121                 linecnt++;                              /* line counter */
 122
 123                 if (*line == '\0' || *line == '#')      /* ignore comment */
 124                         continue;
 125
 126                 if ((cp = strchr(line,'#')) != NULL)    /* trash comments */
 127                         *cp = '\0';
 128
 129                 cp = line;                              /* init `cp' */
 130                 GETSTR;                                 /* get RMP addr */
 131                 if (bcp == cp)                          /* all delimiters */
 132                         continue;
 133
 134                 /*
 135                  *  Get an RMP address from a string.  Abort on failure.
 136                  */
 137                 if ((addr = ParseAddr(bcp)) == NULL) {
 138                         syslog(LOG_ERR,
 139                                "ParseConfig: line %d: can't parse <%s>",
 140                                linecnt, bcp);
 141                         continue;
 142                 }
 143
 144                 if ((client = NewClient(addr)) == NULL) /* alloc new client */
 145                         continue;
 146
 147                 GETSTR;                                 /* get first file */
 148
 149                 /*
 150                  *  If no boot files are spec'd, use the default list.
 151                  *  Otherwise, validate each file (`bcp') against the
 152                  *  list of boot-able files.
 153                  */
 154                 i = 0;
 155                 if (bcp == cp)                          /* no files spec'd */
 156                         for (; i < C_MAXFILE && BootFiles[i] != NULL; i++)
 157                                 client->files[i] = BootFiles[i];
 158                 else {
 159                         do {
 160                                 /*
 161                                  *  For each boot file spec'd, make sure it's
 162                                  *  in our list.  If so, include a pointer to
 163                                  *  it in the CLIENT's list of boot files.
 164                                  */
 165                                 for (j = 0; ; j++) {
 166                                         if (j==C_MAXFILE||BootFiles[j]==NULL) {
 167                                                 syslog(LOG_ERR, "ParseConfig: line %d: no boot file (%s)",
 168                                                        linecnt, bcp);
 169                                                 break;
 170                                         }
 171                                         if (STREQN(BootFiles[j], bcp)) {
 172                                                 if (i < C_MAXFILE)
 173                                                         client->files[i++] =
 174                                                             BootFiles[j];
 175                                                 else
 176                                                         syslog(LOG_ERR, "ParseConfig: line %d: too many boot files (%s)",
 177                                                                linecnt, bcp);
 178                                                 break;
 179                                         }
 180                                 }
 181                                 GETSTR;                 /* get next file */
 182                         } while (bcp != cp);
 183
 184                         /*
 185                          *  Restricted list of boot files were spec'd,
 186                          *  however, none of them were found.  Since we
 187                          *  apparently cant let them boot "just anything",
 188                          *  the entire record is invalidated.
 189                          */
 190                         if (i == 0) {
 191                                 FreeClient(client);
 192                                 continue;
 193                         }
 194                 }
 195
 196                 /*
 197                  *  Link this client into the linked list of clients.
 198                  *  SIGHUP has already been blocked.
 199                  */
 200                 if (Clients)
 201                         client->next = Clients;
 202                 Clients = client;
 203         }
 204
 205         (void) fclose(fp);                              /* close config file */
 206
 207         (void) sigsetmask(omask);                       /* reset signal mask */
 208
 209         return(1);                                      /* return success */
 210 }
 211
 212 /*
 213 **  ParseAddr -- Parse a string containing an RMP address.
 214 **
 215 **      This routine is fairly liberal at parsing an RMP address.  The
 216 **      address must contain 6 octets consisting of between 0 and 2 hex
 217 **      chars (upper/lower case) separated by colons.  If two colons are
 218 **      together (e.g. "::", the octet between them is recorded as being
 219 **      zero.  Hence, the following addrs are all valid and parse to the
 220 **      same thing:
 221 **
 222 **              08:00:09:00:66:ad       8::9:0:66:AD    8::9::66:aD
 223 **
 224 **      For clarity, an RMP address is really an Ethernet address, but
 225 **      since the HP boot code uses IEEE 802.3, it's really an IEEE
 226 **      802.3 address.  Of course, all of these are identical.
 227 **
 228 **      Parameters:
 229 **              str - string representation of an RMP address.
 230 **
 231 **      Returns:
 232 **              pointer to a static array of RMP_ADDRLEN bytes.
 233 **
 234 **      Side Effects:
 235 **              None.
 236 **
 237 **      Warnings:
 238 **              - The return value points to a static buffer; it must
 239 **                be copied if it's to be saved.
 240 */
 241 u_int8_t *
 242 ParseAddr(char *str)
 243 {
 244         static u_int8_t addr[RMP_ADDRLEN];
 245         char *cp;
 246         unsigned i;
 247         int part, subpart;
 248
 249         memset((char *)&addr[0], 0, RMP_ADDRLEN);       /* zero static buffer */
 250
 251         part = subpart = 0;
 252         for (cp = str; *cp; cp++) {
 253                 /*
 254                  *  A colon (`:') must be used to delimit each octet.
 255                  */
 256                 if (*cp == ':') {
 257                         if (++part == RMP_ADDRLEN)      /* too many parts */
 258                                 return(NULL);
 259                         subpart = 0;
 260                         continue;
 261                 }
 262
 263                 /*
 264                  *  Convert hex character to an integer.
 265                  */
 266                 if (isdigit(*cp))
 267                         i = *cp - '0';
 268                 else {
 269                         i = (isupper(*cp)? tolower(*cp): *cp) - 'a' + 10;
 270                         if (i < 10 || i > 15)           /* not a hex char */
 271                                 return(NULL);
 272                 }
 273
 274                 if (subpart++) {
 275                         if (subpart > 2)                /* too many hex chars */
 276                                 return(NULL);
 277                         addr[part] <<= 4;
 278                 }
 279                 addr[part] |= i;
 280         }
 281
 282         if (part != (RMP_ADDRLEN-1))                    /* too few parts */
 283                 return(NULL);
 284
 285         return(&addr[0]);
 286 }
 287
 288 /*
 289 **  GetBootFiles -- record list of files in current (boot) directory.
 290 **
 291 **      Parameters:
 292 **              None.
 293 **
 294 **      Returns:
 295 **              Number of boot files on success, 0 on failure.
 296 **
 297 **      Side Effects:
 298 **              Strings in `BootFiles' are freed/allocated.
 299 **
 300 **      Warnings:
 301 **              - After this routine is called, ParseConfig() must be
 302 **                called to re-order it's list of boot file pointers.
 303 */
 304 int
 305 GetBootFiles(void)
 306 {
 307         DIR *dfd;
 308         struct stat statb;
 309         struct dirent *dp;
 310         int i;
 311
 312         /*
 313          *  Free the current list of boot files.
 314          */
 315         for (i = 0; i < C_MAXFILE && BootFiles[i] != NULL; i++) {
 316                 FreeStr(BootFiles[i]);
 317                 BootFiles[i] = NULL;
 318         }
 319
 320         /*
 321          *  Open current directory to read boot file names.
 322          */
 323         if ((dfd = opendir(".")) == NULL) {     /* open BootDir */
 324                 syslog(LOG_ERR, "GetBootFiles: can't open directory (%s)\n",
 325                        BootDir);
 326                 return(0);
 327         }
 328
 329         /*
 330          *  Read each boot file name and allocate space for it in the
 331          *  list of boot files (BootFiles).  All boot files read after
 332          *  C_MAXFILE will be ignored.
 333          */
 334         i = 0;
 335         for (dp = readdir(dfd); dp != NULL; dp = readdir(dfd)) {
 336                 if (stat(dp->d_name, &statb) < 0 ||
 337                     (statb.st_mode & S_IFMT) != S_IFREG)
 338                         continue;
 339                 if (i == C_MAXFILE)
 340                         syslog(LOG_ERR,
 341                                "GetBootFiles: too many boot files (%s ignored)",
 342                                dp->d_name);
 343                 else if ((BootFiles[i] = NewStr(dp->d_name)) != NULL)
 344                         i++;
 345         }
 346
 347         (void) closedir(dfd);                   /* close BootDir */
 348
 349         if (i == 0)                             /* cant find any boot files */
 350                 syslog(LOG_ERR, "GetBootFiles: no boot files (%s)\n", BootDir);
 351
 352         return(i);
 353 }