lib/libncp/ncpl_rcfile.c

   1 /*
   2  * Copyright (c) 1999, Boris Popov
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/types.h>
  34 #include <sys/queue.h>
  35 #include <ctype.h>
  36 #include <errno.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <stdlib.h>
  40 #include <pwd.h>
  41 #include <unistd.h>
  42
  43 #include <netncp/ncp_lib.h>
  44 #include <netncp/ncp_rcfile.h>
  45 #include <netncp/ncp_cfg.h>
  46
  47 #define NWFS_CFG_FILE   NCP_PREFIX"/etc/nwfs.conf"
  48
  49 struct rcfile *ncp_rc = NULL;
  50
  51 SLIST_HEAD(rcfile_head, rcfile);
  52 static struct rcfile_head pf_head = {NULL};
  53
  54 int rc_merge(char *filename,struct rcfile **rcfile);
  55 static struct rcfile* rc_find(char *filename);
  56 static struct rcsection *rc_findsect(struct rcfile *rcp, char *sectname);
  57 static struct rcsection *rc_addsect(struct rcfile *rcp, char *sectname);
  58 static int rc_sect_free(struct rcsection *rsp);
  59 static struct rckey *rc_sect_findkey(struct rcsection *rsp, char *keyname);
  60 static struct rckey *rc_sect_addkey(struct rcsection *rsp, char *name, char *value);
  61 static void rc_key_free(struct rckey *p);
  62 static void rc_parse(struct rcfile *rcp);
  63
  64
  65 /*
  66  * open rcfile and load its content, if already open - return previous handle
  67  */
  68 int
  69 rc_open(char *filename,char *mode,struct rcfile **rcfile) {
  70         struct rcfile *rcp;
  71         FILE *f;
  72
  73         rcp = rc_find(filename);
  74         if( rcp ) {
  75                 *rcfile = rcp;
  76                 return 0;
  77         }
  78         f = fopen (filename, mode);
  79         if (f==NULL)
  80                 return errno;
  81         rcp = malloc(sizeof(struct rcfile));
  82         if (rcp==NULL) {
  83                 fclose(f);
  84                 return ENOMEM;
  85         }
  86         bzero(rcp, sizeof(struct rcfile));
  87         rcp->rf_name = strdup (filename);
  88         rcp->rf_f = f;
  89         SLIST_INSERT_HEAD(&pf_head, rcp, rf_next);
  90         rc_parse(rcp);
  91         *rcfile = rcp;
  92         return 0;
  93 }
  94
  95 int
  96 rc_merge(char *filename,struct rcfile **rcfile) {
  97         struct rcfile *rcp = *rcfile;
  98         FILE *f, *t;
  99
 100         if (rcp == NULL) {
 101                 return rc_open(filename,"r",rcfile);
 102         }
 103         f = fopen (filename, "r");
 104         if (f==NULL)
 105                 return errno;
 106         t = rcp->rf_f;
 107         rcp->rf_f = f;
 108         rc_parse(rcp);
 109         rcp->rf_f = t;
 110         fclose(f);
 111         return 0;
 112 }
 113
 114 int
 115 rc_close(struct rcfile *rcp) {
 116         struct rcsection *p,*n;
 117
 118         fclose(rcp->rf_f);
 119         for(p = SLIST_FIRST(&rcp->rf_sect);p;) {
 120                 n = p;
 121                 p = SLIST_NEXT(p,rs_next);
 122                 rc_sect_free(n);
 123         }
 124         free(rcp->rf_name);
 125         SLIST_REMOVE(&pf_head, rcp, rcfile, rf_next);
 126         free(rcp);
 127         return 0;
 128 }
 129
 130 static struct rcfile*
 131 rc_find(char *filename) {
 132         struct rcfile *p;
 133
 134         SLIST_FOREACH(p, &pf_head, rf_next)
 135                 if (strcmp (filename, p->rf_name)==0)
 136                         return p;
 137         return 0;
 138 }
 139
 140 static struct rcsection *
 141 rc_findsect(struct rcfile *rcp, char *sectname) {
 142         struct rcsection *p;
 143
 144         SLIST_FOREACH(p, &rcp->rf_sect, rs_next)
 145                 if (strcmp(p->rs_name, sectname)==0)
 146                         return p;
 147         return NULL;
 148 }
 149
 150 static struct rcsection *
 151 rc_addsect(struct rcfile *rcp, char *sectname) {
 152         struct rcsection *p;
 153
 154         p = rc_findsect(rcp, sectname);
 155         if (p) return p;
 156         p = malloc(sizeof(*p));
 157         if (!p) return NULL;
 158         p->rs_name = strdup(sectname);
 159         SLIST_INIT(&p->rs_keys);
 160         SLIST_INSERT_HEAD(&rcp->rf_sect, p, rs_next);
 161         return p;
 162 }
 163
 164 static int
 165 rc_sect_free(struct rcsection *rsp) {
 166         struct rckey *p,*n;
 167
 168         for(p = SLIST_FIRST(&rsp->rs_keys);p;) {
 169                 n = p;
 170                 p = SLIST_NEXT(p,rk_next);
 171                 rc_key_free(n);
 172         }
 173         free(rsp->rs_name);
 174         free(rsp);
 175         return 0;
 176 }
 177
 178 static struct rckey *
 179 rc_sect_findkey(struct rcsection *rsp, char *keyname) {
 180         struct rckey *p;
 181
 182         SLIST_FOREACH(p, &rsp->rs_keys, rk_next)
 183                 if (strcmp(p->rk_name, keyname)==0)
 184                         return p;
 185         return NULL;
 186 }
 187
 188 static struct rckey *
 189 rc_sect_addkey(struct rcsection *rsp, char *name, char *value) {
 190         struct rckey *p;
 191
 192         p = rc_sect_findkey(rsp, name);
 193         if (p) {
 194                 free(p->rk_value);
 195         } else {
 196                 p = malloc(sizeof(*p));
 197                 if (!p) return NULL;
 198                 SLIST_INSERT_HEAD(&rsp->rs_keys, p, rk_next);
 199                 p->rk_name = strdup(name);
 200         }
 201         p->rk_value = value ? strdup(value) : strdup("");
 202         return p;
 203 }
 204
 205 void
 206 rc_sect_delkey(struct rcsection *rsp, struct rckey *p) {
 207
 208         SLIST_REMOVE(&rsp->rs_keys,p,rckey,rk_next);
 209         rc_key_free(p);
 210         return;
 211 }
 212
 213 static void
 214 rc_key_free(struct rckey *p){
 215         free(p->rk_value);
 216         free(p->rk_name);
 217         free(p);
 218 }
 219
 220 enum { stNewLine, stHeader, stSkipToEOL, stGetKey, stGetValue};
 221
 222 static void
 223 rc_parse(struct rcfile *rcp) {
 224         FILE *f = rcp->rf_f;
 225         int state = stNewLine, c;
 226         struct rcsection *rsp = NULL;
 227         struct rckey *rkp = NULL;
 228         char buf[2048];
 229         char *next = buf, *last = &buf[sizeof(buf)-1];
 230
 231         while ((c = getc (f)) != EOF) {
 232                 if (c == '\r')
 233                         continue;
 234                 if (state == stNewLine) {
 235                         next = buf;
 236                         if (isspace(c))
 237                                 continue;       /* skip leading junk */
 238                         if (c == '[') {
 239                                 state = stHeader;
 240                                 rsp = NULL;
 241                                 continue;
 242                         }
 243                         if (c == '#' || c == ';') {
 244                                 state = stSkipToEOL;
 245                         } else {                /* something meaningfull */
 246                                 state = stGetKey;
 247                         }
 248                 }
 249                 if (state == stSkipToEOL || next == last) {/* ignore long lines */
 250                         if (c == '\n'){
 251                                 state = stNewLine;
 252                                 next = buf;
 253                         }
 254                         continue;
 255                 }
 256                 if (state == stHeader) {
 257                         if (c == ']') {
 258                                 *next = 0;
 259                                 next = buf;
 260                                 rsp = rc_addsect(rcp, buf);
 261                                 state = stSkipToEOL;
 262                         } else
 263                                 *next++ = c;
 264                         continue;
 265                 }
 266                 if (state == stGetKey) {
 267                         if (c == ' ' || c == '\t')/* side effect: 'key name='*/
 268                                 continue;         /* become 'keyname='       */
 269                         if (c == '\n') {                /* silently ignore ... */
 270                                 state = stNewLine;
 271                                 continue;
 272                         }
 273                         if (c != '=') {
 274                                 *next++ = c;
 275                                 continue;
 276                         }
 277                         *next = 0;
 278                         if (rsp == NULL) {
 279                                 fprintf(stderr, "Key '%s' defined before section\n", buf);
 280                                 state = stSkipToEOL;
 281                                 continue;
 282                         }
 283                         rkp = rc_sect_addkey(rsp, buf, NULL);
 284                         next = buf;
 285                         state = stGetValue;
 286                         continue;
 287                 }
 288                 /* only stGetValue left */
 289                 if (state != stGetValue) {
 290                         fprintf(stderr, "Well, I can't parse file '%s'\n",rcp->rf_name);
 291                         state = stSkipToEOL;
 292                 }
 293                 if (c != '\n') {
 294                         *next++ = c;
 295                         continue;
 296                 }
 297                 *next = 0;
 298                 rkp->rk_value = strdup(buf);
 299                 state = stNewLine;
 300                 rkp = NULL;
 301         }       /* while */
 302         if (c == EOF && state == stGetValue) {
 303                 *next = 0;
 304                 rkp->rk_value = strdup(buf);
 305         }
 306         return;
 307 }
 308
 309 int
 310 rc_getstringptr(struct rcfile *rcp,char *section, char *key,char **dest) {
 311         struct rcsection *rsp;
 312         struct rckey *rkp;
 313
 314         *dest = NULL;
 315         rsp = rc_findsect(rcp, section);
 316         if (!rsp) return ENOENT;
 317         rkp = rc_sect_findkey(rsp,key);
 318         if (!rkp) return ENOENT;
 319         *dest = rkp->rk_value;
 320         return 0;
 321 }
 322
 323 int
 324 rc_getstring(struct rcfile *rcp,char *section, char *key,int maxlen,char *dest) {
 325         char *value;
 326         int error;
 327
 328         error = rc_getstringptr(rcp, section, key, &value);
 329         if (error) return error;
 330         if (strlen(value) >= maxlen) {
 331                 fprintf(stderr, "line too long for key '%s' in section '%s', max = %d\n",key, section, maxlen);
 332                 return EINVAL;
 333         }
 334         strcpy(dest,value);
 335         return 0;
 336 }
 337
 338 int
 339 rc_getint(struct rcfile *rcp,char *section, char *key,int *value) {
 340         struct rcsection *rsp;
 341         struct rckey *rkp;
 342
 343         rsp = rc_findsect(rcp, section);
 344         if (!rsp) return ENOENT;
 345         rkp = rc_sect_findkey(rsp,key);
 346         if (!rkp) return ENOENT;
 347         errno = 0;
 348         *value = strtol(rkp->rk_value,NULL,0);
 349         if (errno) {
 350                 fprintf(stderr, "invalid int value '%s' for key '%s' in section '%s'\n",rkp->rk_value,key,section);
 351                 return errno;
 352         }
 353         return 0;
 354 }
 355
 356 /*
 357  * 1,yes,true
 358  * 0,no,false
 359  */
 360 int
 361 rc_getbool(struct rcfile *rcp,char *section, char *key,int *value) {
 362         struct rcsection *rsp;
 363         struct rckey *rkp;
 364         char *p;
 365
 366         rsp = rc_findsect(rcp, section);
 367         if (!rsp) return ENOENT;
 368         rkp = rc_sect_findkey(rsp,key);
 369         if (!rkp) return ENOENT;
 370         p = rkp->rk_value;
 371         while (*p && isspace(*p)) p++;
 372         if (*p == '0' || strcasecmp(p,"no") == 0 || strcasecmp(p,"false") == 0) {
 373                 *value = 0;
 374                 return 0;
 375         }
 376         if (*p == '1' || strcasecmp(p,"yes") == 0 || strcasecmp(p,"true") == 0) {
 377                 *value = 1;
 378                 return 0;
 379         }
 380         fprintf(stderr, "invalid boolean value '%s' for key '%s' in section '%s' \n",p, key, section);
 381         return EINVAL;
 382 }
 383
 384 /*
 385  * first read ~/.nwfsrc, next try to merge NWFS_CFG_FILE
 386  */
 387 int
 388 ncp_open_rcfile(void) {
 389         char *home, *fn;
 390         int error;
 391
 392         home = getenv("HOME");
 393         if (home) {
 394                 fn = malloc(strlen(home) + 20);
 395                 sprintf(fn, "%s/.nwfsrc", home);
 396                 error = rc_open(fn,"r",&ncp_rc);
 397                 free (fn);
 398         }
 399         error = rc_merge(NWFS_CFG_FILE, &ncp_rc);
 400         if( ncp_rc == NULL ) {
 401                 printf("Warning: no cfg files found.\n");
 402                 return 1;
 403         }
 404         return 0;
 405 }
 406