dtv-scan-tables.git - dtv-scan-tables Debian packaging

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/* $Id$ * $URL$ * $URL$ * * config file stuff * * Copyright (C) 1999, 2000 Michael Reinelt <michael@reinelt.co.at> * Copyright (C) 2004, 2009 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> * * This file is part of LCD4Linux. * * LCD4Linux 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. * * LCD4Linux 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. * */ /* * exported functions: * * cfg_init (source) * read configuration from source * returns 0 if successful * returns -1 in case of an error * * cfg_source (void) * returns the file the configuration was read from * * 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_list (section) * returns a list of all keys in the specified section * This list was allocated be cfg_list() and must be * freed by the caller! * * cfg_rename (section, old, new) * changes the key of a existing entry * * cfg_get_raw (section, key, defval) * return the a value for a given key in a given section * or <defval> if key does not exist. Does NOT evaluate * the expression. Therefore used to get the expression * itself! * * cfg_get (section, key, defval) * return the a value for a given key in a given section * or <defval> if key does not exist. The specified * value in the config is treated as a expression and * is evaluated! * * cfg_number (section, key, defval, min, int max, *value) * return the a value for a given key in a given section * convert it into a number with syntax checking * check if its in a given range. As it uses cfg_get() * internally, the evaluator is used here, too. * */ #include "config.h" #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 "evaluator.h" #include "cfg.h" #ifdef WITH_DMALLOC #include <dmalloc.h> #endif typedef struct { char *key; char *val; int lock; } ENTRY; static char *Config_File = NULL; static ENTRY *Config = NULL; static int nConfig = 0; /* bsearch compare function for config entries */ static int c_lookup(const void *a, const void *b) { char *key = (char *) a; ENTRY *entry = (ENTRY *) b; return strcasecmp(key, entry->key); } /* qsort compare function for variables */ static int c_sort(const void *a, const void *b) { ENTRY *ea = (ENTRY *) a; ENTRY *eb = (ENTRY *) b; return strcasecmp(ea->key, eb->key); } /* remove leading and trailing whitespace */ static char *strip(char *s, const int strip_comments) { char *p; while (isblank(*s)) s++; for (p = s; *p; p++) { if (*p == '"') do p++; while (*p && *p != '\n' && *p != '\r' && *p != '"'); if (*p == '\'') do p++; while (*p && *p != '\n' && *p != '\r' && *p != '\''); if (*p == '\n' || (strip_comments && *p == '#' && (p == s || *(p - 1) != '\\'))) { *p = '\0'; break; } if (*p == '\r' && *(p + 1) == '\n') { /* replace <CR> from DOS <CR><LF> with blank */ *p = ' '; } } for (p--; p > s && isblank(*p); p--) *p = '\0'; return s; } /* which if a string contains only valid chars */ /* i.e. start with a char and contains chars and nums */ static int validchars(const char *string, const int numstart) { const char *c; for (c = string; *c; c++) { /* first and following chars */ if ((*c >= 'A' && *c <= 'Z') || (*c >= 'a' && *c <= 'z') || (*c == '_')) continue; /* number as first or following char */ if ((numstart || c > string) && *c >= '0' && *c <= '9') continue; /* only following chars */ if ((c > string) && ((*c == '.') || (*c == '-'))) continue; return 0; } return 1; } static void cfg_add(const char *section, const char *key, const char *val, const int lock) { char *buffer; ENTRY *entry; /* allocate buffer */ buffer = malloc(strlen(section) + strlen(key) + 2); *buffer = '\0'; /* prepare section.key */ if (section != NULL && *section != '\0') { strcpy(buffer, section); strcat(buffer, "."); } strcat(buffer, key); /* does the key already exist? */ entry = bsearch(buffer, Config, nConfig, sizeof(ENTRY), c_lookup); if (entry != NULL) { if (entry->lock > lock) return; debug("Warning: key <%s>: value <%s> overwritten with <%s>", buffer, entry->val, val); free(buffer); if (entry->val) free(entry->val); entry->val = strdup(val); return; } nConfig++; Config = realloc(Config, nConfig * sizeof(ENTRY)); Config[nConfig - 1].key = buffer; Config[nConfig - 1].val = strdup(val); Config[nConfig - 1].lock = lock; qsort(Config, nConfig, sizeof(ENTRY), c_sort); } int cfg_cmd(const char *arg) { char *key, *val; char *buffer; buffer = strdup(arg); key = strip(buffer, 0); for (val = key; *val; val++) { if (*val == '=') { *val++ = '\0'; break; } } if (*key == '\0' || *val == '\0') { free(buffer); return -1; } if (!validchars(key, 0)) { free(buffer); return -1; } cfg_add("", key, val, 1); free(buffer); return 0; } char *cfg_list(const char *section) { int i, len; char *key, *list; /* calculate key length */ len = strlen(section) + 1; /* prepare search key */ key = malloc(len + 1); strcpy(key, section); strcat(key, "."); /* start with empty string */ list = malloc(1); *list = '\0'; /* search matching entries */ for (i = 0; i < nConfig; i++) { if (strncasecmp(Config[i].key, key, len) == 0) { list = realloc(list, strlen(list) + strlen(Config[i].key) - len + 2); if (*list != '\0') strcat(list, "|"); strcat(list, Config[i].key + len); } } free(key); return list; } int cfg_rename(const char *section, const char *old, const char *new) { char *buffer; ENTRY *old_entry, *new_entry; /* prepare old section.key */ buffer = malloc(strlen(section) + strlen(old) + 2); *buffer = '\0'; if (section != NULL && *section != '\0') { strcpy(buffer, section); strcat(buffer, "."); } strcat(buffer, old); /* lookup old entry */ old_entry = bsearch(buffer, Config, nConfig, sizeof(ENTRY), c_lookup); free(buffer); if (old_entry == NULL) { error("internal error: cfg_rename(%s, %s, %s) failed: entry not found!", section, old, new); return -1; } /* prepare new section.key */ buffer = malloc(strlen(section) + strlen(new) + 2); *buffer = '\0'; if (section != NULL && *section != '\0') { strcpy(buffer, section); strcat(buffer, "."); } strcat(buffer, new); /* lookup new entry */ new_entry = bsearch(buffer, Config, nConfig, sizeof(ENTRY), c_lookup); if (new_entry != NULL) { info("cfg_rename(%s, %s, %s) failed: entry already exists!", section, old, new); free(buffer); return -1; } /* replace key */ free(old_entry->key); old_entry->key = buffer; /* sort table again */ qsort(Config, nConfig, sizeof(ENTRY), c_sort); return 0; } static char *cfg_lookup(const char *section, const char *key) { int len; char *buffer; ENTRY *entry; /* calculate key length */ len = strlen(key) + 1; if (section != NULL) len += strlen(section) + 1; /* allocate buffer */ buffer = malloc(len); *buffer = '\0'; /* prepare section:key */ if (section != NULL && *section != '\0') { strcpy(buffer, section); strcat(buffer, "."); } strcat(buffer, key); /* search entry */ entry = bsearch(buffer, Config, nConfig, sizeof(ENTRY), c_lookup); /* free buffer again */ free(buffer); if (entry != NULL) return entry->val; return NULL; } char *cfg_get_raw(const char *section, const char *key, const char *defval) { char *val = cfg_lookup(section, key); if (val != NULL) return val; return (char *) defval; } char *cfg_get(const char *section, const char *key, const char *defval) { char *expression; char *retval; void *tree = NULL; RESULT result = { 0, 0, 0, NULL }; expression = cfg_lookup(section, key); if (expression != NULL) { if (*expression == '\0') return ""; if (Compile(expression, &tree) == 0 && Eval(tree, &result) == 0) { retval = strdup(R2S(&result)); DelTree(tree); DelResult(&result); return (retval); } DelTree(tree); DelResult(&result); } if (defval) return strdup(defval); return NULL; } int cfg_number(const char *section, const char *key, const int defval, const int min, const int max, int *value) { char *expression; void *tree = NULL; RESULT result = { 0, 0, 0, NULL }; /* start with default value */ /* in case of an (uncatched) error, you have the */ /* default value set, which may be handy... */ *value = defval; expression = cfg_get_raw(section, key, NULL); if (expression == NULL || *expression == '\0') { return 0; } if (Compile(expression, &tree) != 0) { DelTree(tree); return -1; } if (Eval(tree, &result) != 0) { DelTree(tree); DelResult(&result); return -1; } *value = R2N(&result); DelTree(tree); DelResult(&result); if (*value < min) { error("bad '%s.%s' value '%d' in %s, minimum is %d", section, key, *value, cfg_source(), min); *value = min; return -1; } if (max > min && max != -1 && *value > max) { error("bad '%s.%s' value '%d' in %s, maximum is %d", section, key, *value, cfg_source(), max); *value = max; return -1; } return 1; } static int cfg_check_source(const 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 ! defined(__CYGWIN__) if (stbuf.st_mode & S_IRWXG || stbuf.st_mode & S_IRWXO) { error("security error: group or other have access to '%s'", file); error = -1; } #endif return error; } static int cfg_read(const char *file) { FILE *stream; char buffer[256]; char section[256]; char *line, *key, *val, *end; int section_open, section_close; int error, lineno; stream = fopen(file, "r"); if (stream == NULL) { error("open(%s) failed: %s", file, strerror(errno)); return -1; } /* start with empty section */ strcpy(section, ""); error = 0; lineno = 0; while ((line = fgets(buffer, 256, stream)) != NULL) { /* increment line number */ lineno++; /* skip empty lines */ if (*(line = strip(line, 1)) == '\0') continue; /* reset section flags */ section_open = 0; section_close = 0; /* key is first word */ key = line; /* search first blank between key and value */ for (val = line; *val; val++) { if (isblank(*val)) { *val++ = '\0'; break; } } /* strip value */ val = strip(val, 1); /* search end of value */ if (*val) for (end = val; *(end + 1); end++); else end = val; /* if last char is '{', a section has been opened */ if (*end == '{') { section_open = 1; *end = '\0'; val = strip(val, 0); } /* provess "value" in double-quotes */ if (*val == '"' && *end == '"') { *end = '\0'; val++; } /* if key is '}', a section has been closed */ if (strcmp(key, "}") == 0) { section_close = 1; *key = '\0'; } /* sanity check: '}' should be the only char in a line */ if (section_close && (section_open || *val != '\0')) { error("error in config file '%s' line %d: garbage after '}'", file, lineno); error = 1; break; } /* check key for valid chars */ if (!validchars(key, 0)) { error("error in config file '%s' line %d: key '%s' is invalid", file, lineno, key); error = 1; break; } /* on section-open, check value for valid chars */ if (section_open && !validchars(val, 1)) { error("error in config file '%s' line %d: section '%s' is invalid", file, lineno, val); error = 1; break; } /* on section-open, append new section name */ if (section_open) { /* is the section[] array big enough? */ if (strlen(section) + strlen(key) + 3 > sizeof(section)) { error("error in config file '%s' line %d: section buffer overflow", file, lineno); error = 1; break; } if (*section != '\0') strcat(section, "."); strcat(section, key); if (*val != '\0') { strcat(section, ":"); strcat(section, val); } continue; } /* on section-close, remove last section name */ if (section_close) { /* sanity check: section already empty? */ if (*section == '\0') { error("error in config file '%s' line %d: unmatched closing brace", file, lineno); error = 1; break; } end = strrchr(section, '.'); if (end == NULL) *section = '\0'; else *end = '\0'; continue; } /* finally: add key */ cfg_add(section, key, val, 0); } /* sanity check: are the braces balanced? */ if (!error && *section != '\0') { error("error in config file '%s' line %d: unbalanced braces", file, lineno); error = 1; } fclose(stream); return -error; } static void cfg_dump(void) { int i, len; /* find longest key for pretty output */ len = 1; for (i = 0; i < nConfig; i++) { int l = strlen(Config[i].key); if (l > len) len = l; } info("Dump of %s:", Config_File); for (i = 0; i < nConfig; i++) { info(" %-*s %s", len, Config[i].key, Config[i].val); } info(" "); } int cfg_init(const char *file) { if (cfg_check_source(file) == -1) { return -1; } if (cfg_read(file) < 0) return -1; if (Config_File) free(Config_File); Config_File = strdup(file); if (verbose_level > 1) cfg_dump(); return 0; } char *cfg_source(void) { if (Config_File) return Config_File; else return ""; } int cfg_exit(void) { int i; for (i = 0; i < nConfig; i++) { if (Config[i].key) free(Config[i].key); if (Config[i].val) free(Config[i].val); } if (Config) { free(Config); Config = NULL; } if (Config_File) { free(Config_File); Config_File = NULL; } return 0; }


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