diff options
Diffstat (limited to 'libblkid/src/config.c')
| -rw-r--r-- | libblkid/src/config.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/libblkid/src/config.c b/libblkid/src/config.c new file mode 100644 index 0000000..f229b3e --- /dev/null +++ b/libblkid/src/config.c @@ -0,0 +1,201 @@ +/* + * config.c - blkid.conf routines + * + * Copyright (C) 2009 Karel Zak <kzak@redhat.com> + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + */ + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <ctype.h> +#include <sys/types.h> +#ifdef HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif +#include <stdint.h> +#include <stdarg.h> + +#include "blkidP.h" +#include "env.h" + +static int parse_evaluate(struct blkid_config *conf, char *s) +{ + while(s && *s) { + char *sep; + + if (conf->nevals >= __BLKID_EVAL_LAST) + goto err; + sep = strchr(s, ','); + if (sep) + *sep = '\0'; + if (strcmp(s, "udev") == 0) + conf->eval[conf->nevals] = BLKID_EVAL_UDEV; + else if (strcmp(s, "scan") == 0) + conf->eval[conf->nevals] = BLKID_EVAL_SCAN; + else + goto err; + conf->nevals++; + if (sep) + s = sep + 1; + else + break; + } + return 0; +err: + DBG(CONFIG, ul_debug( + "config file: unknown evaluation method '%s'.", s)); + return -1; +} + +static int parse_next(FILE *fd, struct blkid_config *conf) +{ + char buf[BUFSIZ]; + char *s; + + /* read the next non-blank non-comment line */ + do { + if (fgets (buf, sizeof(buf), fd) == NULL) + return feof(fd) ? 0 : -1; + s = strchr (buf, '\n'); + if (!s) { + /* Missing final newline? Otherwise extremely */ + /* long line - assume file was corrupted */ + if (feof(fd)) + s = strchr (buf, '\0'); + else { + DBG(CONFIG, ul_debug( + "config file: missing newline at line '%s'.", + buf)); + return -1; + } + } + *s = '\0'; + if (--s >= buf && *s == '\r') + *s = '\0'; + + s = buf; + while (*s == ' ' || *s == '\t') /* skip space */ + s++; + + } while (*s == '\0' || *s == '#'); + + if (!strncmp(s, "SEND_UEVENT=", 12)) { + s += 12; + if (*s && !strcasecmp(s, "yes")) + conf->uevent = TRUE; + else if (*s) + conf->uevent = FALSE; + } else if (!strncmp(s, "CACHE_FILE=", 11)) { + s += 11; + free(conf->cachefile); + if (*s) + conf->cachefile = strdup(s); + else + conf->cachefile = NULL; + } else if (!strncmp(s, "EVALUATE=", 9)) { + s += 9; + if (*s && parse_evaluate(conf, s) == -1) + return -1; + } else { + DBG(CONFIG, ul_debug( + "config file: unknown option '%s'.", s)); + return -1; + } + return 0; +} + +/* return real config data or built-in default */ +struct blkid_config *blkid_read_config(const char *filename) +{ + struct blkid_config *conf; + FILE *f; + + if (!filename) + filename = safe_getenv("BLKID_CONF"); + if (!filename) + filename = BLKID_CONFIG_FILE; + + conf = calloc(1, sizeof(*conf)); + if (!conf) + return NULL; + conf->uevent = -1; + + DBG(CONFIG, ul_debug("reading config file: %s.", filename)); + + f = fopen(filename, "r" UL_CLOEXECSTR); + if (!f) { + DBG(CONFIG, ul_debug("%s: does not exist, using built-in default", filename)); + goto dflt; + } + while (!feof(f)) { + if (parse_next(f, conf)) { + DBG(CONFIG, ul_debug("%s: parse error", filename)); + goto err; + } + } +dflt: + if (!conf->nevals) { + conf->eval[0] = BLKID_EVAL_UDEV; + conf->eval[1] = BLKID_EVAL_SCAN; + conf->nevals = 2; + } + if (!conf->cachefile) + conf->cachefile = strdup(BLKID_CACHE_FILE); + if (conf->uevent == -1) + conf->uevent = TRUE; + if (f) + fclose(f); + return conf; +err: + free(conf); + fclose(f); + return NULL; +} + +void blkid_free_config(struct blkid_config *conf) +{ + if (!conf) + return; + free(conf->cachefile); + free(conf); +} + +#ifdef TEST_PROGRAM +/* + * usage: tst_config [<filename>] + */ +int main(int argc, char *argv[]) +{ + int i; + struct blkid_config *conf; + char *filename = NULL; + + blkid_init_debug(BLKID_DEBUG_ALL); + + if (argc == 2) + filename = argv[1]; + + conf = blkid_read_config(filename); + if (!conf) + return EXIT_FAILURE; + + printf("EVALUATE: "); + for (i = 0; i < conf->nevals; i++) + printf("%s ", conf->eval[i] == BLKID_EVAL_UDEV ? "udev" : "scan"); + printf("\n"); + + printf("SEND UEVENT: %s\n", conf->uevent ? "TRUE" : "FALSE"); + printf("CACHE_FILE: %s\n", conf->cachefile); + + blkid_free_config(conf); + return EXIT_SUCCESS; +} +#endif |