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/* $OpenBSD: util.c,v 1.11 2019/07/03 03:24:03 deraadt Exp $ */
/*
* Copyright (c) 2009 Martin Hedenfalk <martin@bzero.se>
*
* 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 <sys/queue.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include <errno.h>
#include "ldapd.h"
#include "log.h"
int
bsnprintf(char *str, size_t size, const char *format, ...)
{
int ret;
va_list ap;
va_start(ap, format);
ret = vsnprintf(str, size, format, ap);
va_end(ap);
if (ret < 0 || ret >= size)
return 0;
return 1;
}
/* Normalize a DN in preparation for searches.
* Modifies its argument.
* Currently only made lowercase, and spaces around comma is removed.
* TODO: unescape backslash escapes, handle UTF-8.
*/
void
normalize_dn(char *dn)
{
size_t n;
char *s, *p;
for (s = p = dn; *s != '\0'; s++) {
if (*s == ' ') {
if (p == dn || p[-1] == ',')
continue;
n = strspn(s, " ");
if (s[n] == '\0' || s[n] == ',')
continue;
}
*p++ = tolower((unsigned char)*s);
}
*p = '\0';
}
/* Returns true (1) if key ends with suffix.
*/
int
has_suffix(struct btval *key, const char *suffix)
{
size_t slen;
slen = strlen(suffix);
if (key->size < slen)
return 0;
return (bcmp((char *)key->data + key->size - slen, suffix, slen) == 0);
}
/* Returns true (1) if key begins with prefix.
*/
int
has_prefix(struct btval *key, const char *prefix)
{
size_t pfxlen;
pfxlen = strlen(prefix);
if (pfxlen > key->size)
return 0;
return (memcmp(key->data, prefix, pfxlen) == 0);
}
int
ber2db(struct ber_element *root, struct btval *val, int compression_level)
{
int rc;
ssize_t len;
uLongf destlen;
Bytef *dest;
void *buf;
struct ber ber;
memset(val, 0, sizeof(*val));
memset(&ber, 0, sizeof(ber));
ber_write_elements(&ber, root);
if ((len = ber_get_writebuf(&ber, &buf)) == -1)
return -1;
if (compression_level > 0) {
val->size = compressBound(len);
val->data = malloc(val->size + sizeof(uint32_t));
if (val->data == NULL) {
log_warn("malloc(%zu)", val->size + sizeof(uint32_t));
ber_free(&ber);
return -1;
}
dest = (char *)val->data + sizeof(uint32_t);
destlen = val->size - sizeof(uint32_t);
if ((rc = compress2(dest, &destlen, buf, len,
compression_level)) != Z_OK) {
log_warn("compress returned %d", rc);
free(val->data);
ber_free(&ber);
return -1;
}
log_debug("compressed entry from %zd -> %lu byte",
len, destlen + sizeof(uint32_t));
*(uint32_t *)val->data = len;
val->size = destlen + sizeof(uint32_t);
val->free_data = 1;
} else {
val->data = buf;
val->size = len;
val->free_data = 1; /* XXX: take over internal br_wbuf */
ber.br_wbuf = NULL;
}
ber_free(&ber);
return 0;
}
struct ber_element *
db2ber(struct btval *val, int compression_level)
{
int rc;
uLongf len;
void *buf;
Bytef *src;
uLong srclen;
struct ber_element *elm;
struct ber ber;
assert(val != NULL);
memset(&ber, 0, sizeof(ber));
if (compression_level > 0) {
if (val->size < sizeof(uint32_t))
return NULL;
len = *(uint32_t *)val->data;
if ((buf = malloc(len)) == NULL) {
log_warn("malloc(%lu)", len);
return NULL;
}
src = (char *)val->data + sizeof(uint32_t);
srclen = val->size - sizeof(uint32_t);
rc = uncompress(buf, &len, src, srclen);
if (rc != Z_OK) {
log_warnx("dbt_to_ber: uncompress returned %d", rc);
free(buf);
return NULL;
}
log_debug("uncompressed entry from %zu -> %lu byte",
val->size, len);
ber_set_readbuf(&ber, buf, len);
elm = ber_read_elements(&ber, NULL);
free(buf);
return elm;
} else {
ber_set_readbuf(&ber, val->data, val->size);
return ber_read_elements(&ber, NULL);
}
}
int
accept_reserve(int sockfd, struct sockaddr *addr, socklen_t *addrlen,
int reserve)
{
if (getdtablecount() + reserve >= getdtablesize()) {
errno = EMFILE;
return -1;
}
return accept4(sockfd, addr, addrlen, SOCK_NONBLOCK);
}
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