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1221 lines (1047 loc) · 25 KB
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/*
** Copyright (c) 2010-2013, The Trusted Domain Project. All rights reserved.
*/
#include "build-config.h"
/* system includes */
#include <sys/param.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <netdb.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
/* librbl includes */
#include "rbl.h"
/* local definitions needed for DNS queries */
#define MAXPACKET 8192
#if defined(__RES) && (__RES >= 19940415)
# define RES_UNC_T char *
#else /* __RES && __RES >= 19940415 */
# define RES_UNC_T unsigned char *
#endif /* __RES && __RES >= 19940415 */
#ifndef T_RRSIG
# define T_RRSIG 46
#endif /* ! T_RRSIG */
/* struct rbl_query -- an open RBL query */
struct rbl_query
{
void * rq_qh;
size_t rq_anslen;
u_char rq_buf[HFIXEDSZ + MAXPACKET];
};
/* struct rbl_handle -- an RBL library context */
struct rbl_handle
{
u_int rbl_timeout;
u_int rbl_cbint;
void * rbl_cbctx;
void * rbl_closure;
void * (*rbl_malloc) (void *closure, size_t nbytes);
void (*rbl_free) (void *closure, void *p);
void (*rbl_dns_callback) (const void *context);
void * rbl_dns_service;
int (*rbl_dns_init) (void **srv);
void (*rbl_dns_close) (void *srv);
int (*rbl_dns_start) (void *srv, int type,
unsigned char *query,
unsigned char *buf,
size_t buflen,
void **qh);
int (*rbl_dns_cancel) (void *srv, void *qh);
int (*rbl_dns_config) (void *srv,
const char *config);
int (*rbl_dns_trustanchor) (void *srv,
const char *trust);
int (*rbl_dns_setns) (void *srv, const char *ns);
int (*rbl_dns_waitreply) (void *srv,
void *qh,
struct timeval *to,
size_t *bytes,
int *error,
int *dnssec);
u_char rbl_qroot[RBL_MAXHOSTNAMELEN + 1];
u_char rbl_error[RBL_MAXERRORSTRING + 1];
};
/*
** Standard UNIX resolver stub functions
*/
struct rbl_res_qh
{
int rq_error;
size_t rq_buflen;
};
/*
** RBL_RES_CANCEL -- cancel a pending resolver query
**
** Parameters:
** srv -- query service handle (ignored)
** qh -- query handle (ignored)
**
** Return value:
** 0 on success, !0 on error
**
** Notes:
** The standard UNIX resolver is synchronous, so in theory this can
** never get called. We have not yet got any use cases for one thread
** canceling another thread's pending queries, so for now just return 0.
*/
static int
rbl_res_cancel(void *srv, void *qh)
{
if (qh != NULL)
free(qh);
return 0;
}
/*
** RBL_RES_QUERY -- initiate a DNS query
**
** Parameters:
** srv -- service handle (ignored)
** type -- RR type to query
** query -- the question to ask
** buf -- where to write the answer
** buflen -- bytes at "buf"
** qh -- query handle, used with rbl_res_waitreply
**
** Return value:
** An RBL_DNS_* constant.
**
** Notes:
** This is a stub for the stock UNIX resolver (res_) functions, which
** are synchronous so no handle needs to be created, so "qh" is set to
** "buf". "buf" is actually populated before this returns (unless
** there's an error).
*/
static int
rbl_res_query(void *srv, int type, unsigned char *query, unsigned char *buf,
size_t buflen, void **qh)
{
int n;
int ret;
struct rbl_res_qh *rq;
unsigned char qbuf[HFIXEDSZ + MAXPACKET];
#ifdef HAVE_RES_NINIT
struct __res_state statp;
#endif /* HAVE_RES_NINIT */
#ifdef HAVE_RES_NINIT
memset(&statp, '\0', sizeof statp);
res_ninit(&statp);
#endif /* HAVE_RES_NINIT */
#ifdef HAVE_RES_NINIT
n = res_nmkquery(&statp, QUERY, (char *) query, C_IN, type, NULL, 0,
NULL, qbuf, sizeof qbuf);
#else /* HAVE_RES_NINIT */
n = res_mkquery(QUERY, (char *) query, C_IN, type, NULL, 0, NULL, qbuf,
sizeof qbuf);
#endif /* HAVE_RES_NINIT */
if (n == (size_t) -1)
{
#ifdef HAVE_RES_NINIT
res_nclose(&statp);
#endif /* HAVE_RES_NINIT */
return RBL_DNS_ERROR;
}
#ifdef HAVE_RES_NINIT
ret = res_nsend(&statp, qbuf, n, buf, buflen);
#else /* HAVE_RES_NINIT */
ret = res_send(qbuf, n, buf, buflen);
#endif /* HAVE_RES_NINIT */
if (ret == -1)
{
#ifdef HAVE_RES_NINIT
res_nclose(&statp);
#endif /* HAVE_RES_NINIT */
return RBL_DNS_ERROR;
}
#ifdef HAVE_RES_NINIT
res_nclose(&statp);
#endif /* HAVE_RES_NINIT */
rq = (struct rbl_res_qh *) malloc(sizeof *rq);
if (rq == NULL)
return RBL_DNS_ERROR;
if (ret == -1)
{
rq->rq_error = errno;
rq->rq_buflen = 0;
}
else
{
rq->rq_error = 0;
rq->rq_buflen = (size_t) ret;
}
*qh = (void *) rq;
return RBL_DNS_SUCCESS;
}
/*
** RBL_RES_WAITREPLY -- wait for a reply to a pending query
**
** Parameters:
** srv -- service handle
** qh -- query handle
** to -- timeout
** bytes -- number of bytes in the reply (returned)
** error -- error code (returned)
**
** Return value:
** A RBL_DNS_* code.
**
** Notes:
** Since the stock UNIX resolver is synchronous, the reply was completed
** before rbl_res_query() returned, and thus this is almost a no-op.
*/
int
rbl_res_waitreply(void *srv, void *qh, struct timeval *to, size_t *bytes,
int *error, int *dnssec)
{
struct rbl_res_qh *rq;
assert(qh != NULL);
rq = qh;
if (bytes != NULL)
*bytes = rq->rq_buflen;
if (error != NULL)
*error = rq->rq_error;
return RBL_DNS_SUCCESS;
}
/*
** RBL_RES_SETNS -- set nameserver list
**
** Parameters:
** srv -- service handle
** nslist -- nameserver list, as a string
**
** Return value:
** 0 -- success
** !0 -- error
*/
int
rbl_res_nslist(void *srv, const char *nslist)
{
#ifdef HAVE_RES_SETSERVERS
int nscount = 0;
char *tmp;
char *ns;
char *last = NULL;
struct sockaddr_in in;
# ifdef AF_INET6
struct sockaddr_in6 in6;
# endif /* AF_INET6 */
struct state *res;
res_sockaddr_union nses[MAXNS];
assert(srv != NULL);
assert(nslist != NULL);
memset(nses, '\0', sizeof nses);
tmp = strdup(nslist);
if (tmp == NULL)
return -1;
for (ns = strtok_r(tmp, ",", &last);
ns != NULL && nscount < MAXNS;
ns = strtok_r(NULL, ",", &last)
{
memset(&in, '\0', sizeof in);
# ifdef AF_INET6
memset(&in6, '\0', sizeof in6);
# endif /* AF_INET6 */
if (inet_pton(AF_INET, ns, (struct in_addr *) &in.sin_addr,
sizeof in.sin_addr) == 1)
{
in.sin_family= AF_INET;
in.sin_port = htons(DNSPORT);
memcpy(&nses[nscount].sin, &in,
sizeof nses[nscount].sin);
nscount++;
}
# ifdef AF_INET6
else if (inet_pton(AF_INET6, ns,
(struct in6_addr *) &in6.sin6_addr,
sizeof in6.sin6_addr) == 1)
{
in6.sin6_family= AF_INET6;
in6.sin6_port = htons(DNSPORT);
memcpy(&nses[nscount].sin6, &in6,
sizeof nses[nscount].sin6);
nscount++;
}
# endif /* AF_INET6 */
else
{
free(tmp);
return -1;
}
}
res = srv;
res_setservers(res, nses, nscount);
free(tmp);
#endif /* HAVE_RES_SETSERVERS */
return 0;
}
/*
** RBL_RES_CLOSE -- shut down the resolver
**
** Parameters:
** srv -- service handle
**
** Return value:
** None.
*/
void
rbl_res_close(void *srv)
{
#ifdef HAVE_RES_NINIT
struct state *res;
res = srv;
res_nclose(res);
free(res);
#endif /* HAVE_RES_NINIT */
}
/*
** RBL_INIT -- initialize an RBL handle
**
** Parameters:
** caller_mallocf -- caller-provided memory allocation function
** caller_freef -- caller-provided memory release function
** closure -- memory closure to pass to the above when used
**
** Return value:
** A new RBL handle suitable for use with other RBL functions, or
** NULL on failure.
**
** Side effects:
** Sudden changes in local density altitude.
*/
RBL *
rbl_init(void *(*caller_mallocf)(void *closure, size_t nbytes),
void (*caller_freef)(void *closure, void *p),
void *closure)
{
RBL *new;
if (caller_mallocf == NULL)
new = (RBL *) malloc(sizeof(struct rbl_handle));
else
new = caller_mallocf(closure, sizeof(struct rbl_handle));
if (new == NULL)
return NULL;
memset(new, '\0', sizeof(struct rbl_handle));
new->rbl_timeout = RBL_DEFTIMEOUT;
new->rbl_closure = closure;
new->rbl_malloc = caller_mallocf;
new->rbl_free = caller_freef;
new->rbl_dns_start = rbl_res_query;
new->rbl_dns_waitreply = rbl_res_waitreply;
new->rbl_dns_cancel = rbl_res_cancel;
new->rbl_dns_setns = rbl_res_nslist;
new->rbl_dns_close = rbl_res_close;
return new;
}
/*
** RBL_CLOSE -- shut down a RBL instance
**
** Parameters:
** rbl -- RBL handle to shut down
**
** Return value:
** None.
*/
void
rbl_close(RBL *rbl)
{
assert(rbl != NULL);
if (rbl->rbl_dns_service != NULL &&
rbl->rbl_dns_close != NULL)
(void) rbl->rbl_dns_close(rbl->rbl_dns_service);
if (rbl->rbl_free != NULL)
rbl->rbl_free(rbl->rbl_closure, rbl);
else
free(rbl);
}
/*
** RBL_GETERROR -- return any stored error string from within the RBL
** context handle
**
** Parameters:
** rbl -- RBL handle from which to retrieve an error string
**
** Return value:
** A pointer to the stored string, or NULL if none was stored.
*/
const u_char *
rbl_geterror(RBL *rbl)
{
assert(rbl != NULL);
return rbl->rbl_error;
}
/*
** RBL_SETDOMAIN -- declare the RBL's domain (the query root)
**
** Parameters:
** rbl -- RBL handle, created by rbl_init()
** qroot -- query root
**
** Return value:
** None (yet).
*/
void
rbl_setdomain(RBL *rbl, u_char *qroot)
{
assert(rbl != NULL);
assert(qroot != NULL);
strncpy(rbl->rbl_qroot, qroot, sizeof rbl->rbl_qroot);
rbl->rbl_qroot[sizeof rbl->rbl_qroot - 1] = '\0';
}
/*
** RBL_SETTIMEOUT -- set the DNS timeout
**
** Parameters:
** rbl -- RBL handle, created by rbl_init()
** timeout -- requested timeout (seconds)
**
** Return value:
** None.
*/
void
rbl_settimeout(RBL *rbl, u_int timeout)
{
assert(rbl != NULL);
rbl->rbl_timeout = timeout;
}
/*
** RBL_SETCALLBACKINT -- set the DNS callback interval
**
** Parameters:
** rbl -- RBL handle, created by rbl_init()
** cbint -- requested callback interval (seconds)
**
** Return value:
** None.
*/
void
rbl_setcallbackint(RBL *rbl, u_int cbint)
{
assert(rbl != NULL);
rbl->rbl_cbint = cbint;
}
/*
** RBL_SETCALLBACKCTX -- set the DNS callback context
**
** Parameters:
** rbl -- RBL handle, created by rbl_init()
** ctx -- context to pass to the DNS callback
**
** Return value:
** None.
*/
void
rbl_setcallbackctx(RBL *rbl, void *ctx)
{
assert(rbl != NULL);
rbl->rbl_cbctx = ctx;
}
/*
** RBL_SETDNSCALLBACK -- set the DNS wait callback
**
** Parameters:
** rbl -- RBL handle, created by rbl_init()
** func -- function to call; should take an opaque context pointer
**
** Return value:
** None.
*/
void
rbl_setdnscallback(RBL *rbl, void (*func)(const void *context))
{
assert(rbl != NULL);
rbl->rbl_dns_callback = func;
}
/*
** RBL_DNS_SET_QUERY_SERVICE -- stores a handle representing the DNS
** query service to be used, returning any
** previous handle
**
** Parameters:
** rbl -- RBL library handle
** h -- handle to be used
**
** Return value:
** Previously stored handle, or NULL if none.
*/
void *
rbl_dns_set_query_service(RBL *rbl, void *h)
{
void *old;
assert(rbl != NULL);
old = rbl->rbl_dns_service;
rbl->rbl_dns_service = h;
return old;
}
/*
** RBL_DNS_SET_QUERY_START -- stores a pointer to a query start function
**
** Parameters:
** rbl -- RBL library handle
** func -- function to use to start queries
**
** Return value:
** None.
**
** Notes:
** "func" should match the following prototype:
** returns int (status)
** void *dns -- receives handle stored by
** rbl_dns_set_query_service()
** int type -- DNS RR query type (C_IN assumed)
** char *query -- question to ask
** char *buf -- buffer into which to write reply
** size_t buflen -- size of buf
** void **qh -- returned query handle
*/
void
rbl_dns_set_query_start(RBL *rbl, int (*func)(void *, int,
unsigned char *,
unsigned char *,
size_t, void **))
{
assert(rbl != NULL);
rbl->rbl_dns_start = func;
}
/*
** RBL_DNS_SET_QUERY_CANCEL -- stores a pointer to a query cancel function
**
** Parameters:
** rbl -- RBL library handle
** func -- function to use to cancel running queries
**
** Return value:
** None.
**
** Notes:
** "func" should match the following prototype:
** returns int (status)
** void *dns -- DNS service handle
** void *qh -- query handle to be canceled
*/
void
rbl_dns_set_query_cancel(RBL *rbl, int (*func)(void *, void *))
{
assert(rbl != NULL);
rbl->rbl_dns_cancel = func;
}
/*
** RBL_DNS_SET_QUERY_WAITREPLY -- stores a pointer to wait for a DNS reply
**
** Parameters:
** rbl -- RBL library handle
** func -- function to use to wait for a reply
**
** Return value:
** None.
**
** Notes:
** "func" should match the following prototype:
** returns int (status)
** void *dns -- DNS service handle
** void *qh -- handle of query that has completed
** struct timeval *timeout -- how long to wait
** size_t *bytes -- bytes returned
** int *error -- error code returned
** int *dnssec -- DNSSEC status returned
*/
void
rbl_dns_set_query_waitreply(RBL *rbl, int (*func)(void *, void *,
struct timeval *,
size_t *, int *,
int *))
{
assert(rbl != NULL);
rbl->rbl_dns_waitreply = func;
}
/*
** RBL_DNS_SET_NSLIST -- stores a pointer to a NS list update function
**
** Parameters:
** lib -- RBL library handle
** func -- function to use to update NS list
**
** Return value:
** None.
**
** Notes:
** "func" should match the following prototype:
** returns int
** void *dns -- DNS service handle
** const char *nslist -- comma-separated list of nameservers
*/
void
rbl_dns_set_nslist(RBL *lib, int (*func)(void *, const char *))
{
assert(lib != NULL);
if (func != NULL)
lib->rbl_dns_setns = func;
else
lib->rbl_dns_setns = rbl_res_nslist;
}
/*
** RBL_DNS_SET_CONFIG -- stores a pointer to a resolver configuration update
** function
**
** Parameters:
** lib -- RBL library handle
** func -- function to use to update resolver configuration
**
** Return value:
** None.
**
** Notes:
** "func" should match the following prototype:
** returns int
** void *dns -- DNS service handle
** const char *config -- arbitrary resolver configuration data
*/
void
rbl_dns_set_config(RBL *lib, int (*func)(void *, const char *))
{
assert(lib != NULL);
lib->rbl_dns_config = func;
}
/*
** RBL_DNS_SET_TRUSTANCHOR -- stores a pointer to a trust anchor update
** function
**
** Parameters:
** lib -- RBL library handle
** func -- function to use to update trust anchor data
**
** Return value:
** None.
**
** Notes:
** "func" should match the following prototype:
** returns int
** void *dns -- DNS service handle
** const char *trust -- arbitrary trust anchor data
*/
void
rbl_dns_set_trustanchor(RBL *lib, int (*func)(void *, const char *))
{
assert(lib != NULL);
lib->rbl_dns_trustanchor = func;
}
/*
** RBL_DNS_SET_CLOSE -- stores a pointer to a resolver shutdown function
**
** Parameters:
** lib -- RBL library handle
** func -- function to use to initialize the resolver
**
** Return value:
** None.
**
** Notes:
** "func" should match the following prototype:
** returns void
** void *srv -- DNS service handle
*/
void
rbl_dns_set_close(RBL *lib, void (*func)(void *))
{
assert(lib != NULL);
if (func != NULL)
lib->rbl_dns_close = func;
else
lib->rbl_dns_close = rbl_res_close;
}
/*
** RBL_DNS_SET_INIT -- stores a pointer to a resolver init function
**
** Parameters:
** lib -- RBL library handle
** func -- function to use to initialize the resolver
**
** Return value:
** None.
**
** Notes:
** "func" should match the following prototype:
** returns int (status)
** void **srv -- DNS service handle (updated)
*/
void
rbl_dns_set_init(RBL *lib, int (*func)(void **))
{
assert(lib != NULL);
lib->rbl_dns_init = func;
}
/*
** RBL_DNS_NSLIST -- requests update to a nameserver list
**
** Parameters:
** lib -- RBL library handle
** nslist -- comma-separated list of nameservers to use
**
** Return value:
** An RBL_STAT_* constant.
*/
RBL_STAT
rbl_dns_nslist(RBL *lib, const char *nslist)
{
int status;
assert(lib != NULL);
assert(nslist != NULL);
if (lib->rbl_dns_setns != NULL)
{
status = lib->rbl_dns_setns(lib->rbl_dns_service, nslist);
if (status != 0)
return RBL_STAT_ERROR;
}
return RBL_STAT_OK;
}
/*
** RBL_DNS_CONFIG -- requests a change to resolver configuration
**
** Parameters:
** lib -- RBL library handle
** config -- opaque configuration string
**
** Return value:
** An RBL_STAT_* constant.
*/
RBL_STAT
rbl_dns_config(RBL *lib, const char *config)
{
int status;
assert(lib != NULL);
assert(config != NULL);
if (lib->rbl_dns_config != NULL)
{
status = lib->rbl_dns_config(lib->rbl_dns_service, config);
if (status != 0)
return RBL_STAT_ERROR;
}
return RBL_STAT_OK;
}
/*
** RBL_DNS_TRUSTANCHOR -- requests a change to resolver trust anchor data
**
** Parameters:
** lib -- RBL library handle
** trust -- opaque trust anchor string
**
** Return value:
** An RBL_STAT_* constant.
*/
RBL_STAT
rbl_dns_trustanchor(RBL *lib, const char *trust)
{
int status;
assert(lib != NULL);
assert(trust != NULL);
if (lib->rbl_dns_trustanchor != NULL)
{
status = lib->rbl_dns_trustanchor(lib->rbl_dns_service, trust);
if (status != 0)
return RBL_STAT_ERROR;
}
return RBL_STAT_OK;
}
/*
** RBL_DNS_INIT -- force nameserver (re)initialization
**
** Parameters:
** lib -- RBL library handle
**
** Return value:
** An RBL_STAT_* constant.
*/
RBL_STAT
rbl_dns_init(RBL *lib)
{
int status;
assert(lib != NULL);
if (lib->rbl_dns_service != NULL &&
lib->rbl_dns_close != NULL)
lib->rbl_dns_close(lib->rbl_dns_service);
lib->rbl_dns_service = NULL;
if (lib->rbl_dns_init != NULL)
return lib->rbl_dns_init(&lib->rbl_dns_service);
else
return RBL_STAT_OK;
}
/*
** RBL_QUERY_CANCEL -- cancel an open query to the RBL
**
** Parameters:
** rbl -- RBL handle, created by rbl_init()
** qh -- query handle
**
** Return value:
** RBL_STAT_* -- as defined
*/
RBL_STAT
rbl_query_cancel(RBL *rbl, void *qh)
{
struct rbl_query *rq;
assert(rbl != NULL);
assert(qh != NULL);
rq = qh;
rbl->rbl_dns_cancel(rbl->rbl_dns_service, rq->rq_qh);
if (rbl->rbl_free != NULL)
rbl->rbl_free(rbl->rbl_closure, rq);
else
free(rq);
return RBL_STAT_OK;
}
/*
** RBL_QUERY_START -- initiate a query to the RBL for entries
**
** Parameters:
** rbl -- RBL handle, created by rbl_init()
** query -- query string
** qh -- query handle (returned)
**
** Return value:
** RBL_STAT_* -- as defined
*/
RBL_STAT
rbl_query_start(RBL *rbl, u_char *query, void **qh)
{
int status;
struct rbl_query *rq;
u_char rblquery[RBL_MAXHOSTNAMELEN + 1];
assert(rbl != NULL);
assert(query != NULL);
assert(qh != NULL);
if (rbl->rbl_qroot[0] == '\0')
{
snprintf(rbl->rbl_error, sizeof rbl->rbl_error,
"query root not set");
return RBL_STAT_INVALID;
}
snprintf(rblquery, sizeof rblquery, "%s.%s", query, rbl->rbl_qroot);
if (rbl->rbl_malloc != NULL)
rq = rbl->rbl_malloc(rbl->rbl_closure, sizeof(*rq));
else
rq = malloc(sizeof(*rq));
if (rq == NULL)
return RBL_STAT_NORESOURCE;
memset(rq, '\0', sizeof *rq);
if (rbl->rbl_dns_service == NULL &&
rbl->rbl_dns_init != NULL &&
rbl->rbl_dns_init(&rbl->rbl_dns_service) != 0)
return RBL_STAT_DNSERROR;
status = rbl->rbl_dns_start(rbl->rbl_dns_service, T_A, rblquery,
rq->rq_buf, sizeof rq->rq_buf, &rq->rq_qh);
if (status == 0)
{
*qh = rq;
return RBL_STAT_OK;
}
else
{
snprintf(rbl->rbl_error, sizeof rbl->rbl_error,
"unable to start query for '%s'", rblquery);
return RBL_STAT_DNSERROR;
}
}
/*
** RBL_QUERY_CHECK -- check for a reply from an active query
**
** Parameters:
** rbl -- RBL handle, created by rbl_init()
** qh -- query handle (returned)
** timeout -- timeout
** res -- 32-bit buffer into which to write the result (can be NULL)
**
** Return value:
** RBL_STAT_* -- as defined
*/
RBL_STAT