diff options
Diffstat (limited to 'usr.sbin/autofs/defined.c')
-rw-r--r-- | usr.sbin/autofs/defined.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/usr.sbin/autofs/defined.c b/usr.sbin/autofs/defined.c new file mode 100644 index 0000000..7f1fb4b --- /dev/null +++ b/usr.sbin/autofs/defined.c @@ -0,0 +1,270 @@ +/*- + * Copyright (c) 2014 The FreeBSD Foundation + * All rights reserved. + * + * This software was developed by Edward Tomasz Napierala under sponsorship + * from the FreeBSD Foundation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * All the "defined" stuff is for handling variables, + * such as ${OSNAME}, in maps. + */ + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/ioctl.h> +#include <sys/param.h> +#include <sys/linker.h> +#include <sys/mount.h> +#include <sys/socket.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <sys/utsname.h> +#include <assert.h> +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <libgen.h> +#include <netdb.h> +#include <signal.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <libutil.h> + +#include "common.h" + +static TAILQ_HEAD(, defined_value) defined_values; + +static const char * +defined_find(const char *name) +{ + struct defined_value *d; + + TAILQ_FOREACH(d, &defined_values, d_next) { + if (strcmp(d->d_name, name) == 0) + return (d->d_value); + } + + return (NULL); +} + +char * +defined_expand(const char *string) +{ + const char *value; + char c, *expanded, *name; + int i, ret, before_len = 0, name_off = 0, name_len = 0, after_off = 0; + bool backslashed = false, bracketed = false; + + expanded = checked_strdup(string); + + for (i = 0; string[i] != '\0'; i++) { + c = string[i]; + if (c == '\\' && backslashed == false) { + backslashed = true; + continue; + } + if (backslashed) { + backslashed = false; + continue; + } + backslashed = false; + if (c != '$') + continue; + + /* + * The 'before_len' variable contains the number + * of characters before the '$'. + */ + before_len = i; + assert(i + 1 < (int)strlen(string)); + if (string[i + 1] == '{') + bracketed = true; + + if (string[i + 1] == '\0') { + log_warnx("truncated variable"); + return (NULL); + } + + /* + * Skip '$'. + */ + i++; + + if (bracketed) { + if (string[i + 1] == '\0') { + log_warnx("truncated variable"); + return (NULL); + } + + /* + * Skip '{'. + */ + i++; + } + + /* + * The 'name_off' variable contains the number + * of characters before the variable name, + * including the "$" or "${". + */ + name_off = i; + + for (; string[i] != '\0'; i++) { + c = string[i]; + /* + * XXX: Decide on the set of characters that can be + * used in a variable name. + */ + if (isalnum(c) || c == '_') + continue; + + /* + * End of variable name. + */ + if (bracketed) { + if (c != '}') + continue; + + /* + * The 'after_off' variable contains the number + * of characters before the rest of the string, + * i.e. after the variable name. + */ + after_off = i + 1; + assert(i > 1); + assert(i - 1 > name_off); + name_len = i - name_off; + break; + } + + after_off = i; + assert(i > 1); + assert(i > name_off); + name_len = i - name_off; + break; + } + + name = strndup(string + name_off, name_len); + if (name == NULL) + log_err(1, "strndup"); + value = defined_find(name); + if (value == NULL) { + log_warnx("undefined variable ${%s}", name); + return (NULL); + } + + /* + * Concatenate it back. + */ + ret = asprintf(&expanded, "%.*s%s%s", + before_len, string, value, string + after_off); + if (ret < 0) + log_err(1, "asprintf"); + + //log_debugx("\"%s\" expanded to \"%s\"", string, expanded); + free(name); + + /* + * Figure out where to start searching for next variable. + */ + string = expanded; + i = before_len + strlen(value); + backslashed = bracketed = false; + before_len = name_off = name_len = after_off = 0; + assert(i <= (int)strlen(string)); + } + + if (before_len != 0 || name_off != 0 || name_len != 0 || after_off != 0) { + log_warnx("truncated variable"); + return (NULL); + } + + return (expanded); +} + +static void +defined_add(const char *name, const char *value) +{ + struct defined_value *d; + const char *found; + + found = defined_find(name); + if (found != NULL) + log_errx(1, "variable %s already defined", name); + + log_debugx("defining variable %s=%s", name, value); + + d = calloc(sizeof(*d), 1); + if (d == NULL) + log_err(1, "calloc"); + d->d_name = checked_strdup(name); + d->d_value = checked_strdup(value); + + TAILQ_INSERT_TAIL(&defined_values, d, d_next); +} + +void +defined_parse_and_add(char *def) +{ + char *name, *value; + + value = def; + name = strsep(&value, "="); + + if (value == NULL || value[0] == '\0') + log_errx(1, "missing variable value"); + if (name == NULL || name[0] == '\0') + log_errx(1, "missing variable name"); + + defined_add(name, value); +} + +void +defined_init(void) +{ + struct utsname name; + int error; + + TAILQ_INIT(&defined_values); + + error = uname(&name); + if (error != 0) + log_err(1, "uname"); + + defined_add("ARCH", name.machine); + defined_add("CPU", name.machine); + defined_add("HOST", name.nodename); + defined_add("OSNAME", name.sysname); + defined_add("OSREL", name.release); + defined_add("OSVERS", name.version); +} |