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aldap.c
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/* $Id: aldap.c,v 1.1.1.1 2018/06/13 15:45:57 reyk Exp $ */
/* $OpenBSD: aldap.c,v 1.1.1.1 2018/06/13 15:45:57 reyk Exp $ */
/*
* Copyright (c) 2008 Alexander Schrijver <aschrijver@openbsd.org>
* Copyright (c) 2006, 2007 Marc Balmer <mbalmer@openbsd.org>
*
* 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 <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <event.h>
#include "aldap.h"
#if 0
#define DEBUG
#endif
#define VERSION 3
static struct ber_element *ldap_parse_search_filter(struct ber_element *,
char *);
static struct ber_element *ldap_do_parse_search_filter(
struct ber_element *, char **);
char **aldap_get_stringset(struct ber_element *);
char *utoa(char *);
static int isu8cont(unsigned char);
char *parseval(char *, size_t);
int aldap_create_page_control(struct ber_element *,
int, struct aldap_page_control *);
int aldap_send(struct aldap *,
struct ber_element *);
unsigned long aldap_application(struct ber_element *);
#ifdef DEBUG
void ldap_debug_elements(struct ber_element *);
#endif
#ifdef DEBUG
#define DPRINTF(x...) printf(x)
#define LDAP_DEBUG(x, y) do { fprintf(stderr, "*** " x "\n"); ldap_debug_elements(y); } while (0)
#else
#define DPRINTF(x...) do { } while (0)
#define LDAP_DEBUG(x, y) do { } while (0)
#endif
unsigned long
aldap_application(struct ber_element *elm)
{
return BER_TYPE_OCTETSTRING;
}
int
aldap_close(struct aldap *al)
{
if (al->tls != NULL) {
tls_close(al->tls);
tls_free(al->tls);
}
close(al->fd);
ber_free(&al->ber);
evbuffer_free(al->buf);
free(al);
return (0);
}
struct aldap *
aldap_init(int fd)
{
struct aldap *a;
if ((a = calloc(1, sizeof(*a))) == NULL)
return NULL;
a->buf = evbuffer_new();
a->fd = fd;
ber_set_application(&a->ber, aldap_application);
return a;
}
int
aldap_tls(struct aldap *ldap, struct tls_config *cfg, const char *name)
{
ldap->tls = tls_client();
if (ldap->tls == NULL) {
ldap->err = ALDAP_ERR_OPERATION_FAILED;
return (-1);
}
if (tls_configure(ldap->tls, cfg) == -1) {
ldap->err = ALDAP_ERR_TLS_ERROR;
return (-1);
}
if (tls_connect_socket(ldap->tls, ldap->fd, name) == -1) {
ldap->err = ALDAP_ERR_TLS_ERROR;
return (-1);
}
if (tls_handshake(ldap->tls) == -1) {
ldap->err = ALDAP_ERR_TLS_ERROR;
return (-1);
}
return (0);
}
int
aldap_send(struct aldap *ldap, struct ber_element *root)
{
int error, wrote;
void *ptr;
char *data;
size_t len, done;
len = ber_calc_len(root);
error = ber_write_elements(&ldap->ber, root);
ber_free_elements(root);
if (error == -1)
return -1;
ber_get_writebuf(&ldap->ber, &ptr);
done = 0;
data = ptr;
while (len > 0) {
if (ldap->tls != NULL) {
wrote = tls_write(ldap->tls, data + done, len);
if (wrote == TLS_WANT_POLLIN ||
wrote == TLS_WANT_POLLOUT)
continue;
} else
wrote = write(ldap->fd, data + done, len);
if (wrote == -1)
return -1;
len -= wrote;
done += wrote;
}
return 0;
}
int
aldap_req_starttls(struct aldap *ldap)
{
struct ber_element *root = NULL, *ber;
if ((root = ber_add_sequence(NULL)) == NULL)
goto fail;
ber = ber_printf_elements(root, "d{tst", ++ldap->msgid, BER_CLASS_APP,
(unsigned long) LDAP_REQ_EXTENDED, LDAP_STARTTLS_OID,
BER_CLASS_CONTEXT, (unsigned long) 0);
if (ber == NULL) {
ldap->err = ALDAP_ERR_OPERATION_FAILED;
goto fail;
}
if (aldap_send(ldap, root) == -1)
goto fail;
return (ldap->msgid);
fail:
if (root != NULL)
ber_free_elements(root);
ldap->err = ALDAP_ERR_OPERATION_FAILED;
return (-1);
}
int
aldap_bind(struct aldap *ldap, char *binddn, char *bindcred)
{
struct ber_element *root = NULL, *elm;
if (binddn == NULL)
binddn = "";
if (bindcred == NULL)
bindcred = "";
if ((root = ber_add_sequence(NULL)) == NULL)
goto fail;
elm = ber_printf_elements(root, "d{tdsst", ++ldap->msgid, BER_CLASS_APP,
(unsigned long)LDAP_REQ_BIND, VERSION, binddn, bindcred,
BER_CLASS_CONTEXT, (unsigned long)LDAP_AUTH_SIMPLE);
if (elm == NULL)
goto fail;
LDAP_DEBUG("aldap_bind", root);
if (aldap_send(ldap, root) == -1) {
root = NULL;
goto fail;
}
return (ldap->msgid);
fail:
if (root != NULL)
ber_free_elements(root);
ldap->err = ALDAP_ERR_OPERATION_FAILED;
return (-1);
}
int
aldap_unbind(struct aldap *ldap)
{
struct ber_element *root = NULL, *elm;
if ((root = ber_add_sequence(NULL)) == NULL)
goto fail;
elm = ber_printf_elements(root, "d{t", ++ldap->msgid, BER_CLASS_APP,
LDAP_REQ_UNBIND_30);
if (elm == NULL)
goto fail;
LDAP_DEBUG("aldap_unbind", root);
if (aldap_send(ldap, root) == -1) {
root = NULL;
goto fail;
}
return (ldap->msgid);
fail:
if (root != NULL)
ber_free_elements(root);
ldap->err = ALDAP_ERR_OPERATION_FAILED;
return (-1);
}
int
aldap_search(struct aldap *ldap, char *basedn, enum scope scope, char *filter,
char **attrs, int typesonly, int sizelimit, int timelimit,
struct aldap_page_control *page)
{
struct ber_element *root = NULL, *ber, *c;
int i;
if ((root = ber_add_sequence(NULL)) == NULL)
goto fail;
ber = ber_printf_elements(root, "d{t", ++ldap->msgid, BER_CLASS_APP,
(unsigned long) LDAP_REQ_SEARCH);
if (ber == NULL) {
ldap->err = ALDAP_ERR_OPERATION_FAILED;
goto fail;
}
c = ber;
ber = ber_printf_elements(ber, "sEEddb", basedn, (long long)scope,
(long long)LDAP_DEREF_NEVER, sizelimit,
timelimit, typesonly);
if (ber == NULL) {
ldap->err = ALDAP_ERR_OPERATION_FAILED;
goto fail;
}
if ((ber = ldap_parse_search_filter(ber, filter)) == NULL) {
ldap->err = ALDAP_ERR_PARSER_ERROR;
goto fail;
}
if ((ber = ber_add_sequence(ber)) == NULL)
goto fail;
if (attrs != NULL)
for (i = 0; attrs[i] != NULL; i++) {
if ((ber = ber_add_string(ber, attrs[i])) == NULL)
goto fail;
}
aldap_create_page_control(c, 100, page);
LDAP_DEBUG("aldap_search", root);
if (aldap_send(ldap, root) == -1) {
root = NULL;
ldap->err = ALDAP_ERR_OPERATION_FAILED;
goto fail;
}
return (ldap->msgid);
fail:
if (root != NULL)
ber_free_elements(root);
return (-1);
}
int
aldap_create_page_control(struct ber_element *elm, int size,
struct aldap_page_control *page)
{
int len;
struct ber c;
struct ber_element *ber = NULL;
c.br_wbuf = NULL;
ber = ber_add_sequence(NULL);
if (page == NULL) {
if (ber_printf_elements(ber, "ds", 50, "") == NULL)
goto fail;
} else {
if (ber_printf_elements(ber, "dx", 50, page->cookie,
page->cookie_len) == NULL)
goto fail;
}
if ((len = ber_write_elements(&c, ber)) < 1)
goto fail;
if (ber_printf_elements(elm, "{t{sx", 2, 0, LDAP_PAGED_OID,
c.br_wbuf, (size_t)len) == NULL)
goto fail;
ber_free_elements(ber);
ber_free(&c);
return len;
fail:
if (ber != NULL)
ber_free_elements(ber);
ber_free(&c);
return (-1);
}
struct aldap_message *
aldap_parse(struct aldap *ldap)
{
int class;
unsigned long type;
long long msgid = 0;
struct aldap_message *m;
struct ber_element *a = NULL, *ep;
char rbuf[512];
int ret, retry;
if ((m = calloc(1, sizeof(struct aldap_message))) == NULL)
return NULL;
retry = 0;
while (m->msg == NULL) {
if (retry || EVBUFFER_LENGTH(ldap->buf) == 0) {
if (ldap->tls) {
ret = tls_read(ldap->tls, rbuf, sizeof(rbuf));
if (ret == TLS_WANT_POLLIN ||
ret == TLS_WANT_POLLOUT)
continue;
} else
ret = read(ldap->fd, rbuf, sizeof(rbuf));
if (ret == -1) {
goto parsefail;
}
evbuffer_add(ldap->buf, rbuf, ret);
}
if (EVBUFFER_LENGTH(ldap->buf) > 0) {
ber_set_readbuf(&ldap->ber, EVBUFFER_DATA(ldap->buf),
EVBUFFER_LENGTH(ldap->buf));
errno = 0;
m->msg = ber_read_elements(&ldap->ber, NULL);
if (errno != 0 && errno != ECANCELED) {
goto parsefail;
}
retry = 1;
}
}
evbuffer_drain(ldap->buf, ldap->ber.br_rptr - ldap->ber.br_rbuf);
LDAP_DEBUG("message", m->msg);
if (ber_scanf_elements(m->msg, "{ite", &msgid, &class, &type, &a) != 0)
goto parsefail;
m->msgid = msgid;
m->message_type = type;
m->protocol_op = a;
switch (m->message_type) {
case LDAP_RES_BIND:
case LDAP_RES_MODIFY:
case LDAP_RES_ADD:
case LDAP_RES_DELETE:
case LDAP_RES_MODRDN:
case LDAP_RES_COMPARE:
case LDAP_RES_SEARCH_RESULT:
if (ber_scanf_elements(m->protocol_op, "{EeSeSe",
&m->body.res.rescode, &m->dn, &m->body.res.diagmsg, &a) != 0)
goto parsefail;
if (m->body.res.rescode == LDAP_REFERRAL)
if (ber_scanf_elements(a, "{e", &m->references) != 0)
goto parsefail;
if (m->msg->be_sub) {
for (ep = m->msg->be_sub; ep != NULL; ep = ep->be_next) {
ber_scanf_elements(ep, "t", &class, &type);
if (class == 2 && type == 0)
m->page = aldap_parse_page_control(ep->be_sub->be_sub,
ep->be_sub->be_sub->be_len);
}
} else
m->page = NULL;
break;
case LDAP_RES_SEARCH_ENTRY:
if (ber_scanf_elements(m->protocol_op, "{eS{e", &m->dn,
&m->body.search.attrs) != 0)
goto parsefail;
break;
case LDAP_RES_SEARCH_REFERENCE:
if (ber_scanf_elements(m->protocol_op, "{e", &m->references) != 0)
goto parsefail;
break;
case LDAP_RES_EXTENDED:
if (ber_scanf_elements(m->protocol_op, "{E",
&m->body.res.rescode) != 0) {
goto parsefail;
}
break;
}
return m;
parsefail:
evbuffer_drain(ldap->buf, EVBUFFER_LENGTH(ldap->buf));
ldap->err = ALDAP_ERR_PARSER_ERROR;
aldap_freemsg(m);
return NULL;
}
struct aldap_page_control *
aldap_parse_page_control(struct ber_element *control, size_t len)
{
char *oid, *s;
char *encoded;
struct ber b;
struct ber_element *elm;
struct aldap_page_control *page;
b.br_wbuf = NULL;
ber_scanf_elements(control, "ss", &oid, &encoded);
ber_set_readbuf(&b, encoded, control->be_next->be_len);
elm = ber_read_elements(&b, NULL);
if ((page = malloc(sizeof(struct aldap_page_control))) == NULL) {
if (elm != NULL)
ber_free_elements(elm);
ber_free(&b);
return NULL;
}
ber_scanf_elements(elm->be_sub, "is", &page->size, &s);
page->cookie_len = elm->be_sub->be_next->be_len;
if ((page->cookie = malloc(page->cookie_len)) == NULL) {
if (elm != NULL)
ber_free_elements(elm);
ber_free(&b);
free(page);
return NULL;
}
memcpy(page->cookie, s, page->cookie_len);
ber_free_elements(elm);
ber_free(&b);
return page;
}
void
aldap_freepage(struct aldap_page_control *page)
{
free(page->cookie);
free(page);
}
void
aldap_freemsg(struct aldap_message *msg)
{
if (msg->msg)
ber_free_elements(msg->msg);
free(msg);
}
int
aldap_get_resultcode(struct aldap_message *msg)
{
return msg->body.res.rescode;
}
char *
aldap_get_dn(struct aldap_message *msg)
{
char *dn;
if (msg->dn == NULL)
return NULL;
if (ber_get_string(msg->dn, &dn) == -1)
return NULL;
return utoa(dn);
}
char **
aldap_get_references(struct aldap_message *msg)
{
if (msg->references == NULL)
return NULL;
return aldap_get_stringset(msg->references);
}
void
aldap_free_references(char **values)
{
int i;
if (values == NULL)
return;
for (i = 0; values[i] != NULL; i++)
free(values[i]);
free(values);
}
char *
aldap_get_diagmsg(struct aldap_message *msg)
{
char *s;
if (msg->body.res.diagmsg == NULL)
return NULL;
if (ber_get_string(msg->body.res.diagmsg, &s) == -1)
return NULL;
return utoa(s);
}
int
aldap_count_attrs(struct aldap_message *msg)
{
int i;
struct ber_element *a;
if (msg->body.search.attrs == NULL)
return (-1);
for (i = 0, a = msg->body.search.attrs;
a != NULL && ber_get_eoc(a) != 0;
i++, a = a->be_next)
;
return i;
}
int
aldap_first_attr(struct aldap_message *msg, char **outkey, char ***outvalues)
{
struct ber_element *b, *c;
char *key;
char **ret;
if (msg->body.search.attrs == NULL)
goto fail;
if (ber_scanf_elements(msg->body.search.attrs, "{s(e)}e",
&key, &b, &c) != 0)
goto fail;
msg->body.search.iter = msg->body.search.attrs->be_next;
if ((ret = aldap_get_stringset(b)) == NULL)
goto fail;
(*outvalues) = ret;
(*outkey) = utoa(key);
return (1);
fail:
(*outkey) = NULL;
(*outvalues) = NULL;
return (-1);
}
int
aldap_next_attr(struct aldap_message *msg, char **outkey, char ***outvalues)
{
struct ber_element *a, *b;
char *key;
char **ret;
if (msg->body.search.iter == NULL)
goto notfound;
LDAP_DEBUG("attr", msg->body.search.iter);
if (ber_get_eoc(msg->body.search.iter) == 0)
goto notfound;
if (ber_scanf_elements(msg->body.search.iter, "{s(e)}e", &key, &a, &b)
!= 0)
goto fail;
msg->body.search.iter = msg->body.search.iter->be_next;
if ((ret = aldap_get_stringset(a)) == NULL)
goto fail;
(*outvalues) = ret;
(*outkey) = utoa(key);
return (1);
fail:
notfound:
(*outkey) = NULL;
(*outvalues) = NULL;
return (-1);
}
int
aldap_match_attr(struct aldap_message *msg, char *inkey, char ***outvalues)
{
struct ber_element *a, *b;
char *descr = NULL;
char **ret;
if (msg->body.search.attrs == NULL)
goto fail;
LDAP_DEBUG("attr", msg->body.search.attrs);
for (a = msg->body.search.attrs;;) {
if (a == NULL)
goto notfound;
if (ber_get_eoc(a) == 0)
goto notfound;
if (ber_scanf_elements(a, "{s(e", &descr, &b) != 0)
goto fail;
if (strcasecmp(descr, inkey) == 0)
goto attrfound;
a = a->be_next;
}
attrfound:
if ((ret = aldap_get_stringset(b)) == NULL)
goto fail;
(*outvalues) = ret;
return (1);
fail:
notfound:
(*outvalues) = NULL;
return (-1);
}
int
aldap_free_attr(char **values)
{
int i;
if (values == NULL)
return -1;
for (i = 0; values[i] != NULL; i++)
free(values[i]);
free(values);
return (1);
}
void
aldap_free_url(struct aldap_url *lu)
{
free(lu->buffer);
}
int
aldap_parse_url(const char *url, struct aldap_url *lu)
{
char *p, *forward, *forward2;
const char *errstr = NULL;
int i;
if ((lu->buffer = p = strdup(url)) == NULL)
return (-1);
/* protocol */
if (strncasecmp(LDAP_URL, p, strlen(LDAP_URL)) == 0) {
lu->protocol = LDAP;
p += strlen(LDAP_URL);
} else if (strncasecmp(LDAPS_URL, p, strlen(LDAPS_URL)) == 0) {
lu->protocol = LDAPS;
p += strlen(LDAPS_URL);
} else if (strncasecmp(LDAPTLS_URL, p, strlen(LDAPTLS_URL)) == 0) {
lu->protocol = LDAPTLS;
p += strlen(LDAPTLS_URL);
} else if (strncasecmp(LDAPI_URL, p, strlen(LDAPI_URL)) == 0) {
lu->protocol = LDAPI;
p += strlen(LDAPI_URL);
} else
lu->protocol = -1;
/* host and optional port */
if ((forward = strchr(p, '/')) != NULL)
*forward = '\0';
/* find the optional port */
if ((forward2 = strchr(p, ':')) != NULL) {
*forward2 = '\0';
/* if a port is given */
if (*(forward2+1) != '\0') {
#define PORT_MAX UINT16_MAX
lu->port = strtonum(++forward2, 0, PORT_MAX, &errstr);
if (errstr)
goto fail;
}
}
/* fail if no host is given */
if (strlen(p) == 0)
goto fail;
lu->host = p;
if (forward == NULL)
goto done;
/* p is assigned either a pointer to a character or to '\0' */
p = ++forward;
if (strlen(p) == 0)
goto done;
/* dn */
if ((forward = strchr(p, '?')) != NULL)
*forward = '\0';
lu->dn = p;
if (forward == NULL)
goto done;
/* p is assigned either a pointer to a character or to '\0' */
p = ++forward;
if (strlen(p) == 0)
goto done;
/* attributes */
if ((forward = strchr(p, '?')) != NULL)
*forward = '\0';
for (i = 0; i < MAXATTR; i++) {
if ((forward2 = strchr(p, ',')) == NULL) {
if (strlen(p) == 0)
break;
lu->attributes[i] = p;
break;
}
*forward2 = '\0';
lu->attributes[i] = p;
p = ++forward2;
}
if (forward == NULL)
goto done;
/* p is assigned either a pointer to a character or to '\0' */
p = ++forward;
if (strlen(p) == 0)
goto done;
/* scope */
if ((forward = strchr(p, '?')) != NULL)
*forward = '\0';
if (strcmp(p, "base") == 0)
lu->scope = LDAP_SCOPE_BASE;
else if (strcmp(p, "one") == 0)
lu->scope = LDAP_SCOPE_ONELEVEL;
else if (strcmp(p, "sub") == 0)
lu->scope = LDAP_SCOPE_SUBTREE;
else
goto fail;
if (forward == NULL)
goto done;
p = ++forward;
if (strlen(p) == 0)
goto done;
/* filter */
if (p)
lu->filter = p;
done:
return (1);
fail:
free(lu->buffer);
lu->buffer = NULL;
return (-1);
}
int
aldap_search_url(struct aldap *ldap, char *url, int typesonly, int sizelimit,
int timelimit, struct aldap_page_control *page)
{
struct aldap_url *lu;
if ((lu = calloc(1, sizeof(*lu))) == NULL)
return (-1);
if (aldap_parse_url(url, lu))
goto fail;
if (aldap_search(ldap, lu->dn, lu->scope, lu->filter, lu->attributes,
typesonly, sizelimit, timelimit, page) == -1)
goto fail;
aldap_free_url(lu);
return (ldap->msgid);
fail:
aldap_free_url(lu);
return (-1);
}
/*
* internal functions
*/
char **
aldap_get_stringset(struct ber_element *elm)
{
struct ber_element *a;
int i;
char **ret;
char *s;
if (elm->be_type != BER_TYPE_OCTETSTRING)
return NULL;
for (a = elm, i = 1; i > 0 && a != NULL && a->be_type ==
BER_TYPE_OCTETSTRING; a = a->be_next, i++)
;
if (i == 1)
return NULL;
if ((ret = calloc(i + 1, sizeof(char *))) == NULL)
return NULL;
for (a = elm, i = 0; a != NULL && a->be_type == BER_TYPE_OCTETSTRING;
a = a->be_next, i++) {
ber_get_string(a, &s);
ret[i] = utoa(s);
}
ret[i + 1] = NULL;
return ret;
}
/*
* Base case for ldap_do_parse_search_filter
*
* returns:
* struct ber_element *, ber_element tree
* NULL, parse failed
*/
static struct ber_element *
ldap_parse_search_filter(struct ber_element *ber, char *filter)
{
struct ber_element *elm;
char *cp;
cp = filter;
if (cp == NULL || *cp == '\0') {
errno = EINVAL;
return (NULL);
}
if ((elm = ldap_do_parse_search_filter(ber, &cp)) == NULL)
return (NULL);
if (*cp != '\0') {
ber_free_elements(elm);
ber_link_elements(ber, NULL);
errno = EINVAL;
return (NULL);
}
return (elm);
}
/*
* Translate RFC4515 search filter string into ber_element tree
*
* returns:
* struct ber_element *, ber_element tree
* NULL, parse failed
*
* notes:
* when cp is passed to a recursive invocation, it is updated
* to point one character beyond the filter that was passed
* i.e., cp jumps to "(filter)" upon return
* ^
* goto's used to discriminate error-handling based on error type
* doesn't handle extended filters (yet)
*
*/
static struct ber_element *
ldap_do_parse_search_filter(struct ber_element *prev, char **cpp)
{
struct ber_element *elm, *root = NULL;
char *attr_desc, *attr_val, *parsed_val, *cp;
size_t len;
unsigned long type;
root = NULL;
/* cpp should pass in pointer to opening parenthesis of "(filter)" */
cp = *cpp;
if (*cp != '(')
goto syntaxfail;
switch (*++cp) {
case '&': /* AND */
case '|': /* OR */
if (*cp == '&')
type = LDAP_FILT_AND;
else
type = LDAP_FILT_OR;
if ((elm = ber_add_set(prev)) == NULL)
goto callfail;
root = elm;
ber_set_header(elm, BER_CLASS_CONTEXT, type);
if (*++cp != '(') /* opening `(` of filter */
goto syntaxfail;
while (*cp == '(') {
if ((elm =
ldap_do_parse_search_filter(elm, &cp)) == NULL)
goto bad;
}
if (*cp != ')') /* trailing `)` of filter */
goto syntaxfail;
break;
case '!': /* NOT */
if ((root = ber_add_sequence(prev)) == NULL)
goto callfail;
ber_set_header(root, BER_CLASS_CONTEXT, LDAP_FILT_NOT);
cp++; /* now points to sub-filter */
if ((elm = ldap_do_parse_search_filter(root, &cp)) == NULL)
goto bad;
if (*cp != ')') /* trailing `)` of filter */
goto syntaxfail;
break;
default: /* SIMPLE || PRESENCE */
attr_desc = cp;
len = strcspn(cp, "()<>~=");
cp += len;
switch (*cp) {
case '~':
type = LDAP_FILT_APPR;
cp++;
break;
case '<':
type = LDAP_FILT_LE;
cp++;
break;
case '>':
type = LDAP_FILT_GE;
cp++;
break;
case '=':
type = LDAP_FILT_EQ; /* assume EQ until disproven */
break;
case '(':
case ')':
default:
goto syntaxfail;
}
attr_val = ++cp;