/*
- * Copyright (c) 2014
Andreas Schneider <asn@samba.org>
- * Copyright (c) 2014 Jakub Hrozek <jakub.hrozek@posteo.se>
+ * Copyright (c) 2014
-2018 Andreas Schneider <asn@samba.org>
+ * Copyright (c) 2014-2016 Jakub Hrozek <jakub.hrozek@posteo.se>
*
* All rights reserved.
*
#include <resolv.h>
+#ifdef HAVE_RES_STATE_U_EXT_NSADDRS
+#define HAVE_RESOLV_IPV6_NSADDRS 1
+#endif
+
/* GCC has printf type attribute check. */
#ifdef HAVE_ATTRIBUTE_PRINTF_FORMAT
#define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
RWRAP_LOG_TRACE
};
+#ifndef HAVE_GETPROGNAME
+static const char *getprogname(void)
+{
+#if defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME)
+ return program_invocation_short_name;
+#elif defined(HAVE_GETEXECNAME)
+ return getexecname();
+#else
+ return NULL;
+#endif /* HAVE_PROGRAM_INVOCATION_SHORT_NAME */
+}
+#endif /* HAVE_GETPROGNAME */
+
static void rwrap_log(enum rwrap_dbglvl_e dbglvl, const char *func, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
# define RWRAP_LOG(dbglvl, ...) rwrap_log((dbglvl), __func__, __VA_ARGS__)
va_list va;
const char *d;
unsigned int lvl = 0;
- int pid = getpid();
const char *prefix = NULL;
+ const char *progname = NULL;
d = getenv("RESOLV_WRAPPER_DEBUGLEVEL");
if (d != NULL) {
break;
}
+ progname = getprogname();
+ if (progname == NULL) {
+ progname = "<unknown>";
+ }
+
fprintf(stderr,
- "%s(%d) - %s: %s\n",
+ "%s[%s (%u)] - %s: %s\n",
prefix,
- pid,
+ progname,
+ (unsigned int)getpid(),
func,
buffer);
}
struct rwrap_soa_rrdata soa_rec;
char cname_rec[MAXDNAME];
char ptr_rec[MAXDNAME];
+ char txt_rec[MAXDNAME];
} rrdata;
char key[MAXDNAME];
NEXT_KEY(str_prio, str_weight);
if (uri == NULL) {
RWRAP_LOG(RWRAP_LOG_ERROR,
- "Malformed URI entry [%s]\n", value);
+ "Malformed URI entry [<null>]\n");
return -1;
}
return 0;
}
+static int rwrap_create_fake_txt_rr(const char *key,
+ const char *value,
+ struct rwrap_fake_rr *rr)
+{
+ memcpy(rr->rrdata.txt_rec, value, strlen(value) + 1);
+
+ memcpy(rr->key, key, strlen(key) + 1);
+ rr->type = ns_t_txt;
+ return 0;
+}
+
static int rwrap_create_fake_soa_rr(const char *key,
const char *value,
struct rwrap_fake_rr *rr)
static ssize_t rwrap_fake_header(uint8_t **header_blob, size_t remaining,
size_t ancount, size_t arcount)
{
- uint8_t *hb;
- HEADER *h;
+ union {
+ uint8_t *blob;
+ HEADER *header;
+ } h;
if (remaining < NS_HFIXEDSZ) {
RWRAP_LOG(RWRAP_LOG_ERROR, "Buffer too small!\n");
return -1;
}
- hb = *header_blob;
- memset(hb, 0, NS_HFIXEDSZ);
+ h.blob = *header_blob;
+ memset(h.blob, 0, NS_HFIXEDSZ);
- h = (HEADER *) hb;
- h->id = res_randomid(); /* random query ID */
- h->qr = 1; /* response flag */
- h->rd = 1; /* recursion desired */
- h->ra = 1; /* recursion available */
+ h.header->id = res_randomid(); /* random query ID */
+ h.header->qr = 1; /* response flag */
+ h.header->rd = 1; /* recursion desired */
+ h.header->ra = 1; /* recursion available */
- h->qdcount = htons(1); /* no. of questions */
- h->ancount = htons(ancount); /* no. of answers */
- h->arcount = htons(arcount); /* no. of add'tl records */
+ h.header->qdcount = htons(1); /* no. of questions */
+ h.header->ancount = htons(ancount); /* no. of answers */
+ h.header->arcount = htons(arcount); /* no. of add'tl records */
- hb += NS_HFIXEDSZ; /* move past the header */
- *header_blob = hb;
+ /* move past the header */
+ *header_blob = h.blob += NS_HFIXEDSZ;
return NS_HFIXEDSZ;
}
return resp_size;
}
+static ssize_t rwrap_fake_txt(struct rwrap_fake_rr *rr,
+ uint8_t *answer,
+ size_t anslen)
+{
+ uint8_t *a = answer;
+ ssize_t resp_size;
+ size_t rdata_size;
+ size_t txt_len;
+
+ if (rr->type != ns_t_txt) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
+ return -1;
+ }
+ RWRAP_LOG(RWRAP_LOG_TRACE, "Adding TXT RR");
+ txt_len = strlen(rr->rrdata.txt_rec) + 1;
+ rdata_size = txt_len;
+
+ resp_size = rwrap_fake_rdata_common(ns_t_txt, rdata_size,
+ rr->key, anslen, &a);
+ if (resp_size < 0) {
+ return -1;
+ }
+
+ memcpy(a, rr->rrdata.txt_rec, txt_len);
+
+ return resp_size;
+}
+
static ssize_t rwrap_fake_soa(struct rwrap_fake_rr *rr,
uint8_t *answer,
size_t anslen)
rc = rwrap_create_fake_ptr_rr(key, value, rr);
break;
}
+ else if (TYPE_MATCH(type, ns_t_txt,
+ rec_type, "TXT", key, query)) {
+ rc = rwrap_create_fake_txt_rr(key, value, rr);
+ break;
+ }
}
if (rc == ENOENT && recursion == 0 && key != NULL) {
case ns_t_soa:
case ns_t_cname:
case ns_t_ptr:
+ case ns_t_txt:
return true;
}
case ns_t_ptr:
resp_data = rwrap_fake_ptr(rr, answer, anslen);
break;
+ case ns_t_txt:
+ resp_data = rwrap_fake_txt(rr, answer, anslen);
+ break;
default:
return -1;
}
resp_size = rwrap_fake_empty(type, rrs->key, answer, anslen);
break;
default:
- RWRAP_LOG(RWRAP_LOG_ERROR,
- "Error searching for [%s]\n", query_name);
+ RWRAP_LOG(RWRAP_LOG_NOTICE,
+ "Searching for [%s] did not return any results\n",
+ query_name);
free(query_name);
return -1;
}
RWRAP_LIBRESOLV
};
-#ifndef NDEBUG
static const char *rwrap_str_lib(enum rwrap_lib lib)
{
switch (lib) {
/* Compiler would warn us about unhandled enum value if we get here */
return "unknown";
}
-#endif
static void *rwrap_load_lib_handle(enum rwrap_lib lib)
{
int i;
#ifdef RTLD_DEEPBIND
- flags |= RTLD_DEEPBIND;
+ const char *env_preload = getenv("LD_PRELOAD");
+ const char *env_deepbind = getenv("RESOLV_WRAPPER_DISABLE_DEEPBIND");
+ bool enable_deepbind = true;
+
+ /* Don't do a deepbind if we run with libasan */
+ if (env_preload != NULL && strlen(env_preload) < 1024) {
+ const char *p = strstr(env_preload, "libasan.so");
+ if (p != NULL) {
+ enable_deepbind = false;
+ }
+ }
+
+ if (env_deepbind != NULL && strlen(env_deepbind) >= 1) {
+ enable_deepbind = false;
+ }
+
+ if (enable_deepbind) {
+ flags |= RTLD_DEEPBIND;
+ }
#endif
switch (lib) {
static int libc_res_ninit(struct __res_state *state)
{
#if !defined(res_ninit) && defined(HAVE_RES_NINIT)
-
-#if defined(HAVE_RES_NINIT_IN_LIBRESOLV)
rwrap_bind_symbol_libresolv(res_ninit);
return rwrap.libresolv.symbols._libc_res_ninit.f(state);
-#else /* HAVE_RES_NINIT_IN_LIBRESOLV */
- rwrap_bind_symbol_libc(res_ninit);
-
- return rwrap.libc.symbols._libc_res_ninit.f(state);
-#endif /* HAVE_RES_NINIT_IN_LIBRESOLV */
-
#elif defined(HAVE___RES_NINIT)
- rwrap_bind_symbol_libc(__res_ninit);
+ rwrap_bind_symbol_libresolv(__res_ninit);
- return rwrap.libc.symbols._libc___res_ninit.f(state);
+ return rwrap.libresolv.symbols._libc___res_ninit.f(state);
#else
#error "No res_ninit function"
#endif
static void libc_res_nclose(struct __res_state *state)
{
#if !defined(res_close) && defined(HAVE_RES_NCLOSE)
-
-#if defined(HAVE_RES_NCLOSE_IN_LIBRESOLV)
rwrap_bind_symbol_libresolv(res_nclose);
rwrap.libresolv.symbols._libc_res_nclose.f(state);
return;
-#else /* HAVE_RES_NCLOSE_IN_LIBRESOLV */
- rwrap_bind_symbol_libc(res_nclose);
-
- rwrap.libc.symbols._libc_res_nclose.f(state);
- return;
-#endif /* HAVE_RES_NCLOSE_IN_LIBRESOLV */
-
#elif defined(HAVE___RES_NCLOSE)
- rwrap_bind_symbol_libc(__res_nclose);
+ rwrap_bind_symbol_libresolv(__res_nclose);
- rwrap.libc.symbols._libc___res_nclose.f(state);
+ rwrap.libresolv.symbols._libc___res_nclose.f(state);
#else
#error "No res_nclose function"
#endif
* RES_HELPER
***************************************************************************/
+static void rwrap_reset_nameservers(struct __res_state *state)
+{
+#ifdef HAVE_RES_STATE_U_EXT_NSADDRS
+ size_t i;
+
+ for (i = 0; i < (size_t)state->nscount; i++) {
+ if (state->_u._ext.nssocks[i] != -1) {
+ close(state->_u._ext.nssocks[i]);
+ state->_u._ext.nssocks[i] = -1;
+ }
+ SAFE_FREE(state->_u._ext.nsaddrs[i]);
+ }
+ memset(&state->_u._ext, 0, sizeof(state->_u._ext));
+ for (i = 0; i < MAXNS; i++) {
+ state->_u._ext.nssocks[i] = -1;
+ state->_u._ext.nsmap[i] = MAXNS + 1;
+ }
+ state->ipv6_unavail = false;
+#endif
+ memset(state->nsaddr_list, 0, sizeof(state->nsaddr_list));
+ state->nscount = 0;
+}
+
static int rwrap_parse_resolv_conf(struct __res_state *state,
const char *resolv_conf)
{
char buf[BUFSIZ];
int nserv = 0;
+ rwrap_reset_nameservers(state);
+
fp = fopen(resolv_conf, "r");
if (fp == NULL) {
RWRAP_LOG(RWRAP_LOG_ERROR,
ok = inet_pton(AF_INET, p, &a);
if (ok) {
- state->nsaddr_list[state->nscount] = (struct sockaddr_in) {
+ state->nsaddr_list[nserv] = (struct sockaddr_in) {
.sin_family = AF_INET,
.sin_addr = a,
.sin_port = htons(53),
.sin_zero = { 0 },
};
- state->nscount++;
nserv++;
} else {
#ifdef HAVE_RESOLV_IPV6_NSADDRS
sa6->sin6_flowinfo = 0;
sa6->sin6_addr = a6;
- state->_u._ext.nsaddrs[state->_u._ext.nscount] = sa6;
- state->_u._ext.nssocks[state->_u._ext.nscount] = -1;
- state->_u._ext.nsmap[state->_u._ext.nscount] = MAXNS + 1;
+ state->_u._ext.nsaddrs[nserv] = sa6;
+ state->_u._ext.nssocks[nserv] = -1;
+ state->_u._ext.nsmap[nserv] = MAXNS + 1;
- state->_u._ext.nscount++;
+ state->_u._ext.nscount6++;
nserv++;
} else {
RWRAP_LOG(RWRAP_LOG_ERROR,
} /* TODO: match other keywords */
}
+ /*
+ * note that state->_u._ext.nscount is left as 0,
+ * this matches glibc and allows resolv wrapper
+ * to work with most (maybe all) glibc versions.
+ */
+ state->nscount = nserv;
+
if (ferror(fp)) {
RWRAP_LOG(RWRAP_LOG_ERROR,
"Reading from %s failed",
const char *resolv_conf = getenv("RESOLV_WRAPPER_CONF");
if (resolv_conf != NULL) {
- uint16_t i;
-
- (void)i; /* maybe unused */
-
- /* Delete name servers */
- state->nscount = 0;
- memset(state->nsaddr_list, 0, sizeof(state->nsaddr_list));
-
-#ifdef HAVE_RESOLV_IPV6_NSADDRS
- state->_u._ext.nscount = 0;
- for (i = 0; i < state->_u._ext.nscount; i++) {
- SAFE_FREE(state->_u._ext.nsaddrs[i]);
- }
-#endif
-
rc = rwrap_parse_resolv_conf(state, resolv_conf);
}
}
static void rwrap_res_nclose(struct __res_state *state)
{
-#ifdef HAVE_RESOLV_IPV6_NSADDRS
- int i;
-#endif
-
+ rwrap_reset_nameservers(state);
libc_res_nclose(state);
-
-#ifdef HAVE_RESOLV_IPV6_NSADDRS
- if (state != NULL) {
- for (i = 0; i < state->_u._ext.nscount; i++) {
- SAFE_FREE(state->_u._ext.nsaddrs[i]);
- }
- }
-#endif
}
#if !defined(res_nclose) && defined(HAVE_RES_NCLOSE)
git.samba.org / resolv_wrapper.git / blobdiff