Foundation copyrights, approved by emaste@. It does not include files which carry other people's copyrights; if you're one of those people, feel free to make similar change. Reviewed by: emaste, imp, gbe (manpages) Differential Revision: https://reviews.freebsd.org/D26980
274 lines
6.1 KiB
C
274 lines
6.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2014 The FreeBSD Foundation
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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* All the "defined" stuff is for handling variables,
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* such as ${OSNAME}, in maps.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <sys/mount.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/utsname.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <libutil.h>
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#include <netdb.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "common.h"
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static TAILQ_HEAD(, defined_value) defined_values;
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static const char *
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defined_find(const char *name)
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{
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struct defined_value *d;
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TAILQ_FOREACH(d, &defined_values, d_next) {
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if (strcmp(d->d_name, name) == 0)
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return (d->d_value);
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}
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return (NULL);
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}
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char *
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defined_expand(const char *string)
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{
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const char *value;
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char c, *expanded, *name;
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int i, ret, before_len = 0, name_off = 0, name_len = 0, after_off = 0;
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bool backslashed = false, bracketed = false;
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expanded = checked_strdup(string);
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for (i = 0; string[i] != '\0'; i++) {
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c = string[i];
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if (c == '\\' && backslashed == false) {
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backslashed = true;
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continue;
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}
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if (backslashed) {
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backslashed = false;
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continue;
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}
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backslashed = false;
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if (c != '$')
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continue;
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/*
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* The 'before_len' variable contains the number
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* of characters before the '$'.
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*/
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before_len = i;
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assert(i + 1 < (int)strlen(string));
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if (string[i + 1] == '{')
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bracketed = true;
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if (string[i + 1] == '\0') {
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log_warnx("truncated variable");
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return (NULL);
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}
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/*
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* Skip '$'.
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*/
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i++;
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if (bracketed) {
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if (string[i + 1] == '\0') {
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log_warnx("truncated variable");
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return (NULL);
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}
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/*
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* Skip '{'.
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*/
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i++;
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}
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/*
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* The 'name_off' variable contains the number
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* of characters before the variable name,
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* including the "$" or "${".
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*/
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name_off = i;
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for (; string[i] != '\0'; i++) {
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c = string[i];
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/*
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* XXX: Decide on the set of characters that can be
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* used in a variable name.
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*/
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if (isalnum(c) || c == '_')
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continue;
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/*
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* End of variable name.
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*/
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if (bracketed) {
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if (c != '}')
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continue;
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/*
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* The 'after_off' variable contains the number
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* of characters before the rest of the string,
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* i.e. after the variable name.
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*/
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after_off = i + 1;
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assert(i > 1);
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assert(i - 1 > name_off);
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name_len = i - name_off;
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break;
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}
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after_off = i;
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assert(i > 1);
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assert(i > name_off);
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name_len = i - name_off;
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break;
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}
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name = strndup(string + name_off, name_len);
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if (name == NULL)
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log_err(1, "strndup");
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value = defined_find(name);
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if (value == NULL) {
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log_warnx("undefined variable ${%s}", name);
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return (NULL);
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}
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/*
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* Concatenate it back.
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*/
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ret = asprintf(&expanded, "%.*s%s%s",
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before_len, string, value, string + after_off);
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if (ret < 0)
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log_err(1, "asprintf");
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//log_debugx("\"%s\" expanded to \"%s\"", string, expanded);
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free(name);
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/*
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* Figure out where to start searching for next variable.
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*/
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string = expanded;
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i = before_len + strlen(value);
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backslashed = bracketed = false;
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before_len = name_off = name_len = after_off = 0;
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assert(i <= (int)strlen(string));
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}
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if (before_len != 0 || name_off != 0 || name_len != 0 || after_off != 0) {
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log_warnx("truncated variable");
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return (NULL);
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}
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return (expanded);
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}
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static void
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defined_add(const char *name, const char *value)
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{
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struct defined_value *d;
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const char *found;
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found = defined_find(name);
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if (found != NULL)
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log_errx(1, "variable %s already defined", name);
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log_debugx("defining variable %s=%s", name, value);
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d = calloc(1, sizeof(*d));
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if (d == NULL)
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log_err(1, "calloc");
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d->d_name = checked_strdup(name);
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d->d_value = checked_strdup(value);
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TAILQ_INSERT_TAIL(&defined_values, d, d_next);
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}
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void
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defined_parse_and_add(char *def)
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{
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char *name, *value;
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value = def;
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name = strsep(&value, "=");
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if (value == NULL || value[0] == '\0')
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log_errx(1, "missing variable value");
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if (name == NULL || name[0] == '\0')
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log_errx(1, "missing variable name");
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defined_add(name, value);
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}
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void
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defined_init(void)
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{
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struct utsname name;
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int error;
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TAILQ_INIT(&defined_values);
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error = uname(&name);
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if (error != 0)
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log_err(1, "uname");
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defined_add("ARCH", name.machine);
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defined_add("CPU", name.machine);
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defined_add("DOLLAR", "$");
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defined_add("HOST", name.nodename);
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defined_add("OSNAME", name.sysname);
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defined_add("OSREL", name.release);
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defined_add("OSVERS", name.version);
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}
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