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|
/* $OpenBSD: conf.c,v 1.8 1999/04/05 21:00:40 niklas Exp $ */
/* $EOM: conf.c,v 1.17 1999/04/05 08:30:41 niklas Exp $ */
/*
* Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ericsson Radio Systems.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "sysdep.h"
#include "app.h"
#include "conf.h"
#include "log.h"
/*
* Radix-64 Encoding.
*/
const u_int8_t bin2asc[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
const u_int8_t asc2bin[] =
{
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59,
60, 61, 255, 255, 255, 255, 255, 255,
255, 0, 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 255, 255, 255, 255, 255,
255, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 255, 255, 255, 255, 255
};
struct conf_binding {
LIST_ENTRY (conf_binding) link;
char *section;
char *tag;
char *value;
};
char *conf_path = CONFIG_FILE;
LIST_HEAD (conf_bindings, conf_binding) conf_bindings;
static off_t conf_sz;
static char *conf_addr;
/*
* Insert a tag-value combination from LINE (the equal sign is at POS)
* into SECTION of our configuration database.
* XXX Should really be a hash table implementation.
*/
static void
conf_set (char *section, char *line, int pos)
{
struct conf_binding *node;
int i;
node = malloc (sizeof *node);
if (!node)
log_fatal ("conf_set: out of memory");
node->section = section;
node->tag = line;
for (i = 0; line[i] && i < pos; i++)
;
line[i] = '\0';
if (conf_get_str (section, line))
{
log_print ("conf_set: duplicate tag [%s]:%s, ignoring...\n", section,
line);
return;
}
node->value = line + pos + 1 + strspn (line + pos + 1, " \t");
LIST_INSERT_HEAD (&conf_bindings, node, link);
log_debug (LOG_MISC, 70, "(%s,%s)->%s", node->section, node->tag,
node->value);
}
/*
* Parse the line LINE of SZ bytes. Skip Comments, recognize section
* headers and feed tag-value pairs into our configuration database.
*/
static void
conf_parse_line (char *line, size_t sz)
{
char *cp = line;
int i;
static char *section = 0;
static int ln = 0;
ln++;
/* Lines starting with '#' or ';' are comments. */
if (*line == '#' || *line == ';')
return;
/* '[section]' parsing... */
if (*line == '[')
{
for (i = 1; i < sz; i++)
if (line[i] == ']')
break;
if (i == sz)
{
log_print ("conf_parse_line: %d:"
"non-matched ']', ignoring until next section", ln);
section = 0;
return;
}
section = malloc (i);
strncpy (section, line + 1, i - 1);
section[i - 1] = '\0';
return;
}
/* Deal with assignments. */
for (i = 0; i < sz; i++)
if (cp[i] == '=')
{
/* If no section, we are ignoring the lines. */
if (!section)
{
log_print ("conf_parse_line: %d: ignoring line due to no section",
ln);
return;
}
conf_set (section, line, i);
return;
}
/* Other non-empty lines are wierd. */
i = strspn (line, " \t");
if (line[i])
log_print ("conf_parse_line: %d: syntax error", ln);
return;
}
/* Parse the mapped configuration file. */
static void
conf_parse (void)
{
char *cp = conf_addr;
char *conf_end = conf_addr + conf_sz;
char *line;
line = cp;
while (cp < conf_end)
{
if (*cp == '\n')
{
/* Check for escaped newlines. */
if (cp > conf_addr && *(cp - 1) == '\\')
*(cp - 1) = *cp = ' ';
else
{
*cp = '\0';
conf_parse_line (line, cp - line);
line = cp + 1;
}
}
cp++;
}
if (cp != line)
log_print ("conf_parse: last line non-terminated, ignored.");
}
/* Open the config file and map it into our address space, then parse it. */
void
conf_init (void)
{
int fd;
struct stat st;
/*
* Start by freeing potential existing configuration.
*
* XXX One could envision doing this late, surviving failures with just
* a warning log message that the new configuration did not get read
* and that the former one persists.
*/
if (conf_addr)
{
while (LIST_FIRST (&conf_bindings))
LIST_REMOVE (LIST_FIRST (&conf_bindings), link);
free (conf_addr);
}
fd = open (conf_path, O_RDONLY);
if (fd == -1)
log_fatal ("open (\"%s\", O_RDONLY)", conf_path);
if (fstat (fd, &st) == -1)
log_fatal ("fstat (%d, &st)", fd);
conf_sz = st.st_size;
conf_addr = malloc (conf_sz);
if (!conf_addr)
log_fatal ("malloc (%d)", conf_sz);
/* XXX I assume short reads won't happen here. */
if (read (fd, conf_addr, conf_sz) != conf_sz)
log_fatal ("read (%d, %p, %d)", fd, conf_addr, conf_sz);
close (fd);
LIST_INIT (&conf_bindings);
conf_parse ();
#ifdef NEED_SYSDEP_APP
/* Let the application layer record on-demand keyed connections. */
app_conf_init_hook ();
#endif
}
/*
* Return the numeric value denoted by TAG in section SECTION or DEF
* if that tag does not exist.
*/
int
conf_get_num (char *section, char *tag, int def)
{
char *value = conf_get_str (section, tag);
if (value)
return atoi (value);
return def;
}
/* Validate X according to the range denoted by TAG in section SECTION. */
int
conf_match_num (char *section, char *tag, int x)
{
char *value = conf_get_str (section, tag);
int val, min, max, n;
if (!value)
return 0;
n = sscanf (value, "%d,%d:%d", &val, &min, &max);
switch (n)
{
case 1:
log_debug (LOG_MISC, 90, "conf_match_num: %s:%s %d==%d?", section, tag,
val, x);
return x == val;
case 3:
log_debug (LOG_MISC, 90, "conf_match_num: %s:%s %d<=%d<=%d?", section,
tag, min, x, max);
return min <= x && max >= x;
default:
log_error ("conf_match_num: section %s tag %s: invalid number spec %s",
section, tag, value);
}
return 0;
}
/* Return the string value denoted by TAG in section SECTION. */
char *
conf_get_str (char *section, char *tag)
{
struct conf_binding *cb;
for (cb = LIST_FIRST (&conf_bindings); cb; cb = LIST_NEXT (cb, link))
if (strcasecmp (section, cb->section) == 0
&& strcasecmp (tag, cb->tag) == 0)
{
log_debug (LOG_MISC, 60, "conf_get_str: (%s, %s) -> %s", section,
tag, cb->value);
return cb->value;
}
log_debug (LOG_MISC, 60,
"conf_get_str: configuration value not found (%s, %s)", section,
tag);
return 0;
}
/*
* Build a list of string values out of the comma separated value denoted by
* TAG in SECTION.
*/
struct conf_list *
conf_get_list (char *section, char *tag)
{
char *liststr = 0, *p, *field;
struct conf_list *list = 0;
struct conf_list_node *node;
list = malloc (sizeof *list);
if (!list)
goto cleanup;
TAILQ_INIT (&list->fields);
list->cnt = 0;
liststr = conf_get_str (section, tag);
if (!liststr)
goto cleanup;
liststr = strdup (liststr);
if (!liststr)
goto cleanup;
p = liststr;
while ((field = strsep (&p, ", \t")) != NULL)
{
if (*field == '\0')
{
log_print ("conf_get_list: empty field, ignoring...");
continue;
}
list->cnt++;
node = calloc (1, sizeof *node);
if (!node)
goto cleanup;
node->field = strdup (field);
if (!node->field)
goto cleanup;
TAILQ_INSERT_TAIL (&list->fields, node, link);
}
free (liststr);
return list;
cleanup:
if (list)
conf_free_list (list);
if (liststr)
free (liststr);
return 0;
}
struct conf_list *
conf_get_tag_list (char *section)
{
struct conf_list *list = 0;
struct conf_list_node *node;
struct conf_binding *cb;
list = malloc (sizeof *list);
if (!list)
goto cleanup;
TAILQ_INIT (&list->fields);
list->cnt = 0;
for (cb = LIST_FIRST (&conf_bindings); cb; cb = LIST_NEXT (cb, link))
if (strcasecmp (section, cb->section) == 0)
{
list->cnt++;
node = calloc (1, sizeof *node);
if (!node)
goto cleanup;
node->field = strdup (cb->tag);
if (!node->field)
goto cleanup;
TAILQ_INSERT_TAIL (&list->fields, node, link);
}
return list;
cleanup:
if (list)
conf_free_list (list);
return 0;
}
/* Decode a PEM encoded buffer. */
int
conf_decode_base64(u_int8_t *out, u_int32_t *len, u_char *buf)
{
u_int32_t c = 0;
u_int8_t c1, c2, c3, c4;
while (*buf)
{
if (*buf > 127 || (c1 = asc2bin[*buf]) == 255)
return 0;
buf++;
if (*buf > 127 || (c2 = asc2bin[*buf]) == 255)
return 0;
buf++;
if (*buf == '=')
{
c3 = c4 = 0;
c++;
/* Check last four bit */
if (c2 & 0xF)
return 0;
if (!strcmp (buf, "=="))
buf++;
else
return 0;
}
else if (*buf > 127 || (c3 = asc2bin[*buf]) == 255)
return 0;
else
{
if (*++buf == '=')
{
c4 = 0;
c += 2;
/* Check last two bit */
if (c3 & 3)
return 0;
if (strcmp(buf, "="))
return 0;
}
else if (*buf > 127 || (c4 = asc2bin[*buf]) == 255)
return 0;
else
c += 3;
}
buf++;
*out++ = (c1 << 2) | (c2 >> 4);
*out++ = (c2 << 4) | (c3 >> 2);
*out++ = (c3 << 6) | c4;
}
*len = c;
return 1;
}
/* Read a line from a stream to the buffer. */
int
conf_get_line (FILE *stream, char *buf, u_int32_t len)
{
char c;
while (len-- > 1)
{
c = fgetc (stream);
if (c == '\n')
{
*buf = 0;
return 1;
}
else if (c == EOF)
break;
*buf++ = c;
}
*buf = 0;
return 0;
}
void
conf_free_list (struct conf_list *list)
{
struct conf_list_node *node = TAILQ_FIRST (&list->fields);
while (node)
{
TAILQ_REMOVE (&list->fields, node, link);
if (node->field)
free (node->field);
free (node);
node = TAILQ_FIRST (&list->fields);
}
free (list);
}
|