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conf.c
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conf.c
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/*
* Copyright (c) Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h> /* fopen, getline */
#include <stdlib.h>
#include <string.h>
#include <kcgi.h>
#include <kcgixml.h>
#include "libkcaldav.h"
#include "db.h"
#include "server.h"
/*
* Parse a key-value pair. Return zero on nothing parsed (empty line),
* -1 on failure, 1 on success where "key" and "val" are assigned
* NUL-terminated values.
*/
static int
conf_parse_keyval(char *buf, const char **key, const char **val)
{
char *cp;
while (*buf != '\0' && isspace((unsigned char)*buf))
buf++;
*key = buf;
while (*buf != '\0' && *buf != '=')
buf++;
if (*buf == '\0' || buf == *key)
return -1;
/* Strip from before and after delim. */
assert(buf > *key && *buf == '=');
for (cp = &buf[-1];
cp > *key && isspace((unsigned char)*cp); cp--)
if (isspace((unsigned char)*cp))
*cp = '\0';
*buf++ = '\0';
while (*buf != '\0' && isspace((unsigned char)*buf))
buf++;
*val = buf;
return **val != '\0';
}
/*
* Optionally read our configuration. This is in a regular
* configuration file format and has only two possible key-value pairs:
*
* logfile=/path/to/logfile
* verbose=[0--3]
*
* If the configuration file does not exist, do not enact any processing
* and accept this as not an error.
*
* Return -1 on system error (exit with err), 0 on soft error (exit with errx),
* 1 on success.
*/
int
conf_read(const char *fn, struct conf *conf)
{
const char *key, *val, *er;
FILE *f = NULL;
char *line = NULL;
size_t linesize = 0, i;
ssize_t linelen;
int rc = 0, rrc;
memset(conf, 0, sizeof(struct conf));
/*
* Deprecated compile-time constants. Allow these to be overriden by
* the configuration file.
*/
#ifdef LOGFILE
#warning "LOGFILE" is deprecated: use "CFGFILE" instead.
if ((conf->logfile = strdup(LOGFILE)) == NULL)
return -1;
#endif
#if defined(DEBUG) && DEBUG >= 0
#warning "DEBUG" is deprecated: use "CFGFILE" instead.
conf->verbose = DEBUG;
#endif
if (fn != NULL && fn[0] != '\0')
if ((f = fopen(fn, "r")) == NULL && errno != ENOENT)
return -1;
if (f == NULL)
return 1;
while ((linelen = getline(&line, &linesize, f)) != -1) {
/*
* Strip everything following the first
* unescaped hash, un-escaping along the way.
*/
for (i = 0; line[i] != '\0'; ) {
if (line[i] != '#') {
i++;
continue;
}
if (i == 0 || line[i - 1] != '\\') {
line[i] = '\0';
linelen = i;
break;
}
assert(i > 0);
assert(line[i - 1] == '\\');
/*
* Shift the buffer left, including the
* trailing NUL terminator.
*/
memmove(&line[i - 1], &line[i], linelen - i);
}
/* Strip trailing white-space. */
while (linelen > 0 &&
isspace((unsigned char)line[linelen - 1]))
line[--linelen] = '\0';
if (linelen == 0)
continue;
/* Parse key-value pairs. */
if ((rrc = conf_parse_keyval(line, &key, &val)) == -1)
break;
else if (rrc == 0)
continue;
if (strcmp(key, "logfile") == 0) {
free(conf->logfile);
if ((conf->logfile = strdup(val)) == NULL)
return -1;
} else if (strcmp(key, "debug") == 0) {
conf->verbose = strtonum(val, 0, 10, &er);
if (er != NULL)
break;
} else
break;
}
free(line);
if (!ferror(f) && fclose(f) != EOF)
rc = 1;
return rc;
}