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. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *      from: @(#)parseconf.c   8.1 (Berkeley) 6/4/93
  42  *
  43  * From: Utah Hdr: parseconf.c 3.1 92/07/06
  44  * Author: Jeff Forys, University of Utah CSS
  45  *
  46  * @(#)parseconf.c      8.1 (Berkeley) 6/4/93
  47  * $FreeBSD: src/libexec/rbootd/parseconf.c,v 1.9.2.1 2001/03/05 11:17:52 kris Exp $
  48  * $DragonFly: src/libexec/rbootd/parseconf.c,v 1.3 2008/04/20 13:44:24 swildner Exp $
  49  */
  50
  51 #include <sys/param.h>
  52 #include <sys/stat.h>
  53 #include <sys/time.h>
  54
  55 #include <ctype.h>
  56 #include <dirent.h>
  57 #include <fcntl.h>
  58 #include <signal.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <syslog.h>
  63 #include "defs.h"
  64
  65 /*
  66 **  ParseConfig -- parse the config file into linked list of clients.
  67 **
  68 **      Parameters:
  69 **              None.
  70 **
  71 **      Returns:
  72 **              1 on success, 0 otherwise.
  73 **
  74 **      Side Effects:
  75 **              - Linked list of clients will be (re)allocated.
  76 **
  77 **      Warnings:
  78 **              - GetBootFiles() must be called before this routine
  79 **                to create a linked list of default boot files.
  80 */
  81 int
  82 ParseConfig()
  83 {
  84         FILE *fp;
  85         CLIENT *client;
  86         u_int8_t *addr;
  87         char line[C_LINELEN];
  88         char *cp, *bcp;
  89         int i, j;
  90         int omask, linecnt = 0;
  91
  92         if (BootAny)                            /* ignore config file */
  93                 return(1);
  94
  95         FreeClients();                          /* delete old list of clients */
  96
  97         if ((fp = fopen(ConfigFile, "r")) == NULL) {
  98                 syslog(LOG_ERR, "ParseConfig: can't open config file (%s)",
  99                        ConfigFile);
 100                 return(0);
 101         }
 102
 103         /*
 104          *  We've got to block SIGHUP to prevent reconfiguration while
 105          *  dealing with the linked list of Clients.  This can be done
 106          *  when actually linking the new client into the list, but
 107          *  this could have unexpected results if the server was HUP'd
 108          *  whilst reconfiguring.  Hence, it is done here.
 109          */
 110         omask = sigblock(sigmask(SIGHUP));
 111
 112         /*
 113          *  GETSTR positions `bcp' at the start of the current token,
 114          *  and null terminates it.  `cp' is positioned at the start
 115          *  of the next token.  spaces & commas are separators.
 116          */
 117 #define GETSTR  while (isspace(*cp) || *cp == ',') cp++;        \
 118                 bcp = cp;                                       \
 119                 while (*cp && *cp!=',' && !isspace(*cp)) cp++;  \
 120                 if (*cp) *cp++ = '\0'
 121
 122         /*
 123          *  For each line, parse it into a new CLIENT struct.
 124          */
 125         while (fgets(line, C_LINELEN, fp) != NULL) {
 126                 linecnt++;                              /* line counter */
 127
 128                 if (*line == '\0' || *line == '#')      /* ignore comment */
 129                         continue;
 130
 131                 if ((cp = strchr(line,'#')) != NULL)    /* trash comments */
 132                         *cp = '\0';
 133
 134                 cp = line;                              /* init `cp' */
 135                 GETSTR;                                 /* get RMP addr */
 136                 if (bcp == cp)                          /* all delimiters */
 137                         continue;
 138
 139                 /*
 140                  *  Get an RMP address from a string.  Abort on failure.
 141                  */
 142                 if ((addr = ParseAddr(bcp)) == NULL) {
 143                         syslog(LOG_ERR,
 144                                "ParseConfig: line %d: can't parse <%s>",
 145                                linecnt, bcp);
 146                         continue;
 147                 }
 148
 149                 if ((client = NewClient(addr)) == NULL) /* alloc new client */
 150                         continue;
 151
 152                 GETSTR;                                 /* get first file */
 153
 154                 /*
 155                  *  If no boot files are spec'd, use the default list.
 156                  *  Otherwise, validate each file (`bcp') against the
 157                  *  list of boot-able files.
 158                  */
 159                 i = 0;
 160                 if (bcp == cp)                          /* no files spec'd */
 161                         for (; i < C_MAXFILE && BootFiles[i] != NULL; i++)
 162                                 client->files[i] = BootFiles[i];
 163                 else {
 164                         do {
 165                                 /*
 166                                  *  For each boot file spec'd, make sure it's
 167                                  *  in our list.  If so, include a pointer to
 168                                  *  it in the CLIENT's list of boot files.
 169                                  */
 170                                 for (j = 0; ; j++) {
 171                                         if (j==C_MAXFILE||BootFiles[j]==NULL) {
 172                                                 syslog(LOG_ERR, "ParseConfig: line %d: no boot file (%s)",
 173                                                        linecnt, bcp);
 174                                                 break;
 175                                         }
 176                                         if (STREQN(BootFiles[j], bcp)) {
 177                                                 if (i < C_MAXFILE)
 178                                                         client->files[i++] =
 179                                                             BootFiles[j];
 180                                                 else
 181                                                         syslog(LOG_ERR, "ParseConfig: line %d: too many boot files (%s)",
 182                                                                linecnt, bcp);
 183                                                 break;
 184                                         }
 185                                 }
 186                                 GETSTR;                 /* get next file */
 187                         } while (bcp != cp);
 188
 189                         /*
 190                          *  Restricted list of boot files were spec'd,
 191                          *  however, none of them were found.  Since we
 192                          *  apparently cant let them boot "just anything",
 193                          *  the entire record is invalidated.
 194                          */
 195                         if (i == 0) {
 196                                 FreeClient(client);
 197                                 continue;
 198                         }
 199                 }
 200
 201                 /*
 202                  *  Link this client into the linked list of clients.
 203                  *  SIGHUP has already been blocked.
 204                  */
 205                 if (Clients)
 206                         client->next = Clients;
 207                 Clients = client;
 208         }
 209
 210         (void) fclose(fp);                              /* close config file */
 211
 212         (void) sigsetmask(omask);                       /* reset signal mask */
 213
 214         return(1);                                      /* return success */
 215 }
 216
 217 /*
 218 **  ParseAddr -- Parse a string containing an RMP address.
 219 **
 220 **      This routine is fairly liberal at parsing an RMP address.  The
 221 **      address must contain 6 octets consisting of between 0 and 2 hex
 222 **      chars (upper/lower case) separated by colons.  If two colons are
 223 **      together (e.g. "::", the octet between them is recorded as being
 224 **      zero.  Hence, the following addrs are all valid and parse to the
 225 **      same thing:
 226 **
 227 **              08:00:09:00:66:ad       8::9:0:66:AD    8::9::66:aD
 228 **
 229 **      For clarity, an RMP address is really an Ethernet address, but
 230 **      since the HP boot code uses IEEE 802.3, it's really an IEEE
 231 **      802.3 address.  Of course, all of these are identical.
 232 **
 233 **      Parameters:
 234 **              str - string representation of an RMP address.
 235 **
 236 **      Returns:
 237 **              pointer to a static array of RMP_ADDRLEN bytes.
 238 **
 239 **      Side Effects:
 240 **              None.
 241 **
 242 **      Warnings:
 243 **              - The return value points to a static buffer; it must
 244 **                be copied if it's to be saved.
 245 */
 246 u_int8_t *
 247 ParseAddr(str)
 248         char *str;
 249 {
 250         static u_int8_t addr[RMP_ADDRLEN];
 251         char *cp;
 252         unsigned i;
 253         int part, subpart;
 254
 255         memset((char *)&addr[0], 0, RMP_ADDRLEN);       /* zero static buffer */
 256
 257         part = subpart = 0;
 258         for (cp = str; *cp; cp++) {
 259                 /*
 260                  *  A colon (`:') must be used to delimit each octet.
 261                  */
 262                 if (*cp == ':') {
 263                         if (++part == RMP_ADDRLEN)      /* too many parts */
 264                                 return(NULL);
 265                         subpart = 0;
 266                         continue;
 267                 }
 268
 269                 /*
 270                  *  Convert hex character to an integer.
 271                  */
 272                 if (isdigit(*cp))
 273                         i = *cp - '0';
 274                 else {
 275                         i = (isupper(*cp)? tolower(*cp): *cp) - 'a' + 10;
 276                         if (i < 10 || i > 15)           /* not a hex char */
 277                                 return(NULL);
 278                 }
 279
 280                 if (subpart++) {
 281                         if (subpart > 2)                /* too many hex chars */
 282                                 return(NULL);
 283                         addr[part] <<= 4;
 284                 }
 285                 addr[part] |= i;
 286         }
 287
 288         if (part != (RMP_ADDRLEN-1))                    /* too few parts */
 289                 return(NULL);
 290
 291         return(&addr[0]);
 292 }
 293
 294 /*
 295 **  GetBootFiles -- record list of files in current (boot) directory.
 296 **
 297 **      Parameters:
 298 **              None.
 299 **
 300 **      Returns:
 301 **              Number of boot files on success, 0 on failure.
 302 **
 303 **      Side Effects:
 304 **              Strings in `BootFiles' are freed/allocated.
 305 **
 306 **      Warnings:
 307 **              - After this routine is called, ParseConfig() must be
 308 **                called to re-order it's list of boot file pointers.
 309 */
 310 int
 311 GetBootFiles()
 312 {
 313         DIR *dfd;
 314         struct stat statb;
 315         struct dirent *dp;
 316         int i;
 317
 318         /*
 319          *  Free the current list of boot files.
 320          */
 321         for (i = 0; i < C_MAXFILE && BootFiles[i] != NULL; i++) {
 322                 FreeStr(BootFiles[i]);
 323                 BootFiles[i] = NULL;
 324         }
 325
 326         /*
 327          *  Open current directory to read boot file names.
 328          */
 329         if ((dfd = opendir(".")) == NULL) {     /* open BootDir */
 330                 syslog(LOG_ERR, "GetBootFiles: can't open directory (%s)\n",
 331                        BootDir);
 332                 return(0);
 333         }
 334
 335         /*
 336          *  Read each boot file name and allocate space for it in the
 337          *  list of boot files (BootFiles).  All boot files read after
 338          *  C_MAXFILE will be ignored.
 339          */
 340         i = 0;
 341         for (dp = readdir(dfd); dp != NULL; dp = readdir(dfd)) {
 342                 if (stat(dp->d_name, &statb) < 0 ||
 343                     (statb.st_mode & S_IFMT) != S_IFREG)
 344                         continue;
 345                 if (i == C_MAXFILE)
 346                         syslog(LOG_ERR,
 347                                "GetBootFiles: too many boot files (%s ignored)",
 348                                dp->d_name);
 349                 else if ((BootFiles[i] = NewStr(dp->d_name)) != NULL)
 350                         i++;
 351         }
 352
 353         (void) closedir(dfd);                   /* close BootDir */
 354
 355         if (i == 0)                             /* cant find any boot files */
 356                 syslog(LOG_ERR, "GetBootFiles: no boot files (%s)\n", BootDir);
 357
 358         return(i);
 359 }