lcd4linux.git - lcd4linux Debian packaging

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/* $Id: cfg.c,v 1.12 2001/03/09 12:14:24 reinelt Exp $ * * config file stuff * * Copyright 1999, 2000 by Michael Reinelt (reinelt@eunet.at) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * * $Log: cfg.c,v $ * Revision 1.12 2001/03/09 12:14:24 reinelt * * minor cleanups * * Revision 1.11 2001/03/08 15:25:38 ltoetsch * improved exec * * Revision 1.10 2001/03/07 18:10:21 ltoetsch * added e(x)ec commands * * Revision 1.9 2000/08/10 09:44:09 reinelt * * new debugging scheme: error(), info(), debug() * uses syslog if in daemon mode * * Revision 1.8 2000/07/31 06:46:35 reinelt * * eliminated some compiler warnings with glibc * * Revision 1.7 2000/04/15 11:13:54 reinelt * * added '-d' (debugging) switch * added several debugging messages * removed config entry 'Delay' for HD44780 driver * delay loop for HD44780 will be calibrated automatically * * Revision 1.6 2000/04/03 04:46:38 reinelt * * added '-c key=val' option * * Revision 1.5 2000/03/28 07:22:15 reinelt * * version 0.95 released * X11 driver up and running * minor bugs fixed * * Revision 1.4 2000/03/26 20:00:44 reinelt * * README.Raster added * * Revision 1.3 2000/03/26 19:03:52 reinelt * * more Pixmap renaming * quoting of '#' in config file * * Revision 1.2 2000/03/10 17:36:02 reinelt * * first unstable but running release * * Revision 1.1 2000/03/10 11:40:47 reinelt * *** empty log message *** * * Revision 1.3 2000/03/07 11:01:34 reinelt * * system.c cleanup * * Revision 1.2 2000/03/06 06:04:06 reinelt * * minor cleanups * */ /* * exported functions: * * cfg_cmd (arg) * allows us to overwrite entries in the * config-file from the command line. * arg is 'key=value' * cfg_cmd can be called _before_ cfg_read() * returns 0 if ok, -1 if arg cannot be parsed * * cfg_set (key, value) * pre-set key's value * should be called before cfg_read() * so we can specify 'default values' * * cfg_get (key) * return the a value for a given key * or NULL if key does not exist * * cfg_read (file) * read configuration from file * returns 0 if successful * returns -1 in case of an error * * cfg_file (void) * returns the file the configuration was read from * */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <ctype.h> #include <errno.h> #include <unistd.h> #include <sys/stat.h> #include "debug.h" #include "cfg.h" typedef struct { char *key; char *val; int lock; } ENTRY; static char *Config_File=NULL; static ENTRY *Config=NULL; static int nConfig=0; static char *strip (char *s, int strip_comments) { char *p; while (isblank(*s)) s++; for (p=s; *p; p++) { if (*p=='"') do p++; while (*p && *p!='\n' && *p!='"'); if (*p=='\'') do p++; while (*p && *p!='\n' && *p!='\''); if (*p=='\n' || (strip_comments && *p=='#' && (p==s || *(p-1)!='\\'))) { *p='\0'; break; } } for (p--; p>s && isblank(*p); p--) *p='\0'; return s; } static char *dequote (char *string) { char *s=string; char *p=string; do { if (*s=='\\' && *(s+1)=='#') { *p++=*++s; } else { *p++=*s; } } while (*s++); return string; } static void cfg_add (char *key, char *val, int lock) { int i; for (i=0; i<nConfig; i++) { if (strcasecmp(Config[i].key, key)==0) { if (Config[i].lock>lock) return; if (Config[i].val) free (Config[i].val); Config[i].val=dequote(strdup(val)); return; } } nConfig++; Config=realloc(Config, nConfig*sizeof(ENTRY)); Config[i].key=strdup(key); Config[i].val=dequote(strdup(val)); Config[i].lock=lock; } int cfg_cmd (char *arg) { char *key, *val; char buffer[256]; strncpy (buffer, arg, sizeof(buffer)); key=strip(buffer, 0); for (val=key; *val; val++) { if (*val=='=') { *val++='\0'; break; } } if (*key=='\0' || *val=='\0') return -1; cfg_add (key, val, 1); return 0; } void cfg_set (char *key, char *val) { cfg_add (key, val, 0); } char *cfg_get (char *key) { int i; for (i=0; i<nConfig; i++) { if (strcasecmp(Config[i].key, key)==0) { return Config[i].val; } } return NULL; } static int check_cfg_file(char *file) { /* as passwords and commands are stored in the config file, * we will check that: * - file is a normal file (or /dev/null) * - file owner is owner of program * - file is not accessible by group * - file is not accessible by other */ struct stat stbuf; uid_t uid, gid; int error; uid = geteuid(); gid = getegid(); if (stat(file, &stbuf) == -1) { error ("stat(%s) failed: %s", file, strerror(errno)); return -1; } if (S_ISCHR(stbuf.st_mode) && strcmp(file, "/dev/null") == 0) return 0; error=0; if (!S_ISREG(stbuf.st_mode)) { error ("security error: '%s' is not a regular file", file); error=-1; } if (stbuf.st_uid != uid || stbuf.st_gid != gid) { error ("security error: owner and/or group of '%s' don't match", file); error=-1; } if (stbuf.st_mode & S_IRWXG || stbuf.st_mode & S_IRWXO) { error ("security error: group or other have access to '%s'", file); error=-1; } return error; } int cfg_read (char *file) { FILE *stream; char buffer[256]; char *line, *p, *s; if (check_cfg_file(file) == -1) { error("config file '%s' is insecure, aborting", file); exit(2); } stream=fopen (file, "r"); if (stream==NULL) { error ("open(%s) failed: %s", file, strerror(errno)); return-1; } if (Config_File) free (Config_File); Config_File=strdup(file); while ((line=fgets(buffer,256,stream))!=NULL) { if (*(line=strip(line, 1))=='\0') continue; for (p=line; *p; p++) { if (isblank(*p)) { *p++='\0'; break; } } p=strip(p, 1); if (*p) for (s=p; *(s+1); s++); else s=p; if (*p=='"' && *s=='"') { *s='\0'; p++; } else if (*p=='\'' && *s=='\'') { *s='\0'; p++; } cfg_set (line, p); } fclose (stream); return 0; } char *cfg_file (void) { if (Config_File) return Config_File; else return ""; }


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