mirror of
https://github.com/darlinghq/darling-libresolv.git
synced 2024-11-26 22:10:20 +00:00
143 lines
2.7 KiB
C
143 lines
2.7 KiB
C
#ifndef __APPLE__
|
|
#include "port_before.h"
|
|
#include "fd_setsize.h"
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <arpa/nameser.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <errno.h>
|
|
#include <netdb.h>
|
|
#include <resolv.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#ifndef __APPLE__
|
|
#include <isc/dst.h>
|
|
#include "port_after.h"
|
|
#else
|
|
#include "dst.h"
|
|
#endif
|
|
|
|
#include "res_private.h"
|
|
|
|
// #define DEBUG
|
|
#include "res_debug.h"
|
|
|
|
|
|
/* res_nsendsigned */
|
|
int
|
|
res_nsendsigned(res_state statp, const u_char *msg, int msglen,
|
|
ns_tsig_key *key, u_char *answer, int anslen)
|
|
{
|
|
res_state nstatp;
|
|
DST_KEY *dstkey;
|
|
int usingTCP = 0;
|
|
u_char *newmsg;
|
|
int newmsglen, bufsize, siglen;
|
|
u_char sig[64];
|
|
HEADER *hp;
|
|
time_t tsig_time;
|
|
int ret;
|
|
|
|
dst_init();
|
|
|
|
nstatp = (res_state) malloc(sizeof(*statp));
|
|
if (nstatp == NULL) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
memcpy(nstatp, statp, sizeof(*statp));
|
|
nstatp->_pad = 9;
|
|
|
|
bufsize = msglen + 1024;
|
|
newmsg = (u_char *) malloc(bufsize);
|
|
if (newmsg == NULL) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
memcpy(newmsg, msg, msglen);
|
|
newmsglen = msglen;
|
|
|
|
if (ns_samename(key->alg, NS_TSIG_ALG_HMAC_MD5) != 1)
|
|
dstkey = NULL;
|
|
else
|
|
dstkey = dst_buffer_to_key(key->name, KEY_HMAC_MD5,
|
|
NS_KEY_TYPE_AUTH_ONLY,
|
|
NS_KEY_PROT_ANY,
|
|
key->data, key->len);
|
|
if (dstkey == NULL) {
|
|
errno = EINVAL;
|
|
free(nstatp);
|
|
free(newmsg);
|
|
return (-1);
|
|
}
|
|
|
|
nstatp->nscount = 1;
|
|
siglen = sizeof(sig);
|
|
ret = ns_sign(newmsg, &newmsglen, bufsize, ns_r_noerror, dstkey, NULL, 0,
|
|
sig, &siglen, 0);
|
|
if (ret < 0) {
|
|
free (nstatp);
|
|
free (newmsg);
|
|
dst_free_key(dstkey);
|
|
if (ret == NS_TSIG_ERROR_NO_SPACE)
|
|
errno = EMSGSIZE;
|
|
else if (ret == -1)
|
|
errno = EINVAL;
|
|
return (ret);
|
|
}
|
|
|
|
if (newmsglen > NS_PACKETSZ || (nstatp->options & RES_IGNTC))
|
|
usingTCP = 1;
|
|
if (usingTCP == 0)
|
|
nstatp->options |= RES_IGNTC;
|
|
else
|
|
nstatp->options |= RES_USEVC;
|
|
|
|
retry:
|
|
|
|
ret = res_nsend(nstatp, newmsg, newmsglen, answer, anslen);
|
|
if (ret < 0) {
|
|
free (nstatp);
|
|
free (newmsg);
|
|
dst_free_key(dstkey);
|
|
return (ret);
|
|
}
|
|
|
|
anslen = ret;
|
|
ret = ns_verify(answer, &anslen, dstkey, sig, siglen,
|
|
NULL, NULL, &tsig_time, nstatp->options & RES_KEEPTSIG);
|
|
if (ret != 0) {
|
|
Dprint(nstatp->pfcode & RES_PRF_REPLY,
|
|
(stdout, ";; TSIG invalid (%s)\n", p_rcode(ret)));
|
|
free (nstatp);
|
|
free (newmsg);
|
|
dst_free_key(dstkey);
|
|
if (ret == -1)
|
|
errno = EINVAL;
|
|
else
|
|
errno = ENOTTY;
|
|
return (-1);
|
|
}
|
|
Dprint(nstatp->pfcode & RES_PRF_REPLY, (stdout, ";; TSIG ok\n"));
|
|
|
|
hp = (HEADER *) answer;
|
|
if (hp->tc && usingTCP == 0) {
|
|
nstatp->options &= ~RES_IGNTC;
|
|
usingTCP = 1;
|
|
goto retry;
|
|
}
|
|
|
|
free (nstatp);
|
|
free (newmsg);
|
|
dst_free_key(dstkey);
|
|
return (anslen);
|
|
}
|