/*
- * Copyright (c) 2014
Andreas Schneider <asn@samba.org>
- * Copyright (c) 2014 Jakub Hrozek <jakub.hrozek@gmail.com>
+ * Copyright (c) 2014
-2018 Andreas Schneider <asn@samba.org>
+ * Copyright (c) 2014-2016 Jakub Hrozek <jakub.hrozek@posteo.se>
*
* All rights reserved.
*
#include <errno.h>
#include <arpa/inet.h>
+#ifdef HAVE_ARPA_NAMESER_H
+#include <arpa/nameser.h>
+#endif /* HAVE_ARPA_NAMESER_H */
#include <netinet/in.h>
+#include <sys/socket.h>
#include <sys/types.h>
#include <stdarg.h>
#include <stdlib.h>
#define RWRAP_DEFAULT_FAKE_TTL 600
#endif /* RWRAP_DEFAULT_FAKE_TTL */
+#ifndef HAVE_NS_NAME_COMPRESS
+#define ns_name_compress dn_comp
+#endif
+
+#define ns_t_uri 256
+
enum rwrap_dbglvl_e {
RWRAP_LOG_ERROR = 0,
RWRAP_LOG_WARN,
+ RWRAP_LOG_NOTICE,
RWRAP_LOG_DEBUG,
RWRAP_LOG_TRACE
};
-#ifdef NDEBUG
-# define RWRAP_LOG(...)
-#else /* NDEBUG */
-
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__)
const char *d;
unsigned int lvl = 0;
int pid = getpid();
+ const char *prefix = NULL;
d = getenv("RESOLV_WRAPPER_DEBUGLEVEL");
if (d != NULL) {
lvl = atoi(d);
}
+ if (lvl < dbglvl) {
+ return;
+ }
+
va_start(va, format);
vsnprintf(buffer, sizeof(buffer), format, va);
va_end(va);
- if (lvl >= dbglvl) {
- switch (dbglvl) {
- case RWRAP_LOG_ERROR:
- fprintf(stderr,
- "RWRAP_ERROR(%d) - %s: %s\n",
- pid, func, buffer);
- break;
- case RWRAP_LOG_WARN:
- fprintf(stderr,
- "RWRAP_WARN(%d) - %s: %s\n",
- pid, func, buffer);
- break;
- case RWRAP_LOG_DEBUG:
- fprintf(stderr,
- "RWRAP_DEBUG(%d) - %s: %s\n",
- pid, func, buffer);
- break;
- case RWRAP_LOG_TRACE:
- fprintf(stderr,
- "RWRAP_TRACE(%d) - %s: %s\n",
- pid, func, buffer);
- break;
- }
+ switch (dbglvl) {
+ case RWRAP_LOG_ERROR:
+ prefix = "RWRAP_ERROR";
+ break;
+ case RWRAP_LOG_WARN:
+ prefix = "RWRAP_WARN";
+ break;
+ case RWRAP_LOG_NOTICE:
+ prefix = "RWRAP_NOTICE";
+ break;
+ case RWRAP_LOG_DEBUG:
+ prefix = "RWRAP_DEBUG";
+ break;
+ case RWRAP_LOG_TRACE:
+ prefix = "RWRAP_TRACE";
+ break;
}
+
+ fprintf(stderr,
+ "%s(%d) - %s: %s\n",
+ prefix,
+ pid,
+ func,
+ buffer);
}
-#endif /* NDEBUG RWRAP_LOG */
#ifndef SAFE_FREE
#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
} \
} while(0);
-#define RWRAP_MAX_RECURSION 5
+#define RWRAP_MAX_RECURSION 64
/* Priority and weight can be omitted from the hosts file, but need to be part
* of the output
*/
#define DFL_SRV_PRIO 1
#define DFL_SRV_WEIGHT 100
+#define DFL_URI_PRIO 1
+#define DFL_URI_WEIGHT 100
struct rwrap_srv_rrdata {
uint16_t port;
char hostname[MAXDNAME];
};
+struct rwrap_uri_rrdata {
+ uint16_t prio;
+ uint16_t weight;
+ char uri[MAXDNAME];
+};
+
struct rwrap_soa_rrdata {
uint32_t serial;
uint32_t refresh;
struct in_addr a_rec;
struct in6_addr aaaa_rec;
struct rwrap_srv_rrdata srv_rec;
+ struct rwrap_uri_rrdata uri_rec;
struct rwrap_soa_rrdata soa_rec;
char cname_rec[MAXDNAME];
+ char ptr_rec[MAXDNAME];
+ char txt_rec[MAXDNAME];
} rrdata;
char key[MAXDNAME];
rr->type = ns_t_aaaa;
return 0;
}
+static int rwrap_create_fake_ns_rr(const char *key,
+ const char *value,
+ struct rwrap_fake_rr *rr)
+{
+ memcpy(rr->rrdata.srv_rec.hostname, value, strlen(value) + 1);
+ memcpy(rr->key, key, strlen(key) + 1);
+ rr->type = ns_t_ns;
+ return 0;
+}
static int rwrap_create_fake_srv_rr(const char *key,
const char *value,
return 0;
}
+static int rwrap_create_fake_uri_rr(const char *key,
+ const char *value,
+ struct rwrap_fake_rr *rr)
+{
+ char *str_prio;
+ char *str_weight;
+ const char *uri;
+
+ /* parse the value into priority, weight, and uri
+ * and check the validity */
+ uri = value;
+ NEXT_KEY(uri, str_prio);
+ NEXT_KEY(str_prio, str_weight);
+ if (uri == NULL) {
+ RWRAP_LOG(RWRAP_LOG_ERROR,
+ "Malformed URI entry [%s]\n", value);
+ return -1;
+ }
+
+ if (str_prio) {
+ rr->rrdata.uri_rec.prio = atoi(str_prio);
+ } else {
+ rr->rrdata.uri_rec.prio = DFL_URI_PRIO;
+ }
+ if (str_weight) {
+ rr->rrdata.uri_rec.weight = atoi(str_weight);
+ } else {
+ rr->rrdata.uri_rec.weight = DFL_URI_WEIGHT;
+ }
+ memcpy(rr->rrdata.uri_rec.uri, uri, strlen(uri) + 1);
+
+ memcpy(rr->key, key, strlen(key) + 1);
+ rr->type = ns_t_uri;
+ 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)
return 0;
}
+static int rwrap_create_fake_ptr_rr(const char *key,
+ const char *value,
+ struct rwrap_fake_rr *rr)
+{
+ memcpy(rr->rrdata.ptr_rec , value, strlen(value) + 1);
+ memcpy(rr->key, key, strlen(key) + 1);
+ rr->type = ns_t_ptr;
+ return 0;
+}
+
/* Prepares a fake header with a single response. Advances header_blob */
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; /* resursion 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;
}
uint8_t *a = answer_ptr;
ssize_t resp_size;
- if (rr == NULL || rr->type != ns_t_a) {
- RWRAP_LOG(RWRAP_LOG_ERROR,
- "Malformed record, no or wrong value!\n");
+ if (rr->type != ns_t_a) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
return -1;
}
RWRAP_LOG(RWRAP_LOG_TRACE, "Adding A RR");
uint8_t *a = answer;
ssize_t resp_size;
- if (rr == NULL || rr->type != ns_t_aaaa) {
- RWRAP_LOG(RWRAP_LOG_ERROR,
- "Malformed record, no or wrong value!\n");
+ if (rr->type != ns_t_aaaa) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
return -1;
}
RWRAP_LOG(RWRAP_LOG_TRACE, "Adding AAAA RR");
return resp_size;
}
+static ssize_t rwrap_fake_ns(struct rwrap_fake_rr *rr,
+ uint8_t *answer,
+ size_t anslen)
+{
+ uint8_t *a = answer;
+ ssize_t resp_size = 0;
+ size_t rdata_size;
+ unsigned char hostname_compressed[MAXDNAME];
+ ssize_t compressed_len;
+
+ if (rr->type != ns_t_ns) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
+ return -1;
+ }
+ RWRAP_LOG(RWRAP_LOG_TRACE, "Adding NS RR");
+
+ /* Prepare the data to write */
+ compressed_len = ns_name_compress(rr->rrdata.srv_rec.hostname,
+ hostname_compressed,
+ MAXDNAME,
+ NULL,
+ NULL);
+ if (compressed_len < 0) {
+ return -1;
+ }
+
+ /* Is this enough? */
+ rdata_size = compressed_len;
+
+ resp_size = rwrap_fake_rdata_common(ns_t_ns, rdata_size,
+ rr->key, anslen, &a);
+ if (resp_size < 0) {
+ return -1;
+ }
+
+ memcpy(a, hostname_compressed, compressed_len);
+
+ return resp_size;
+}
+
static ssize_t rwrap_fake_srv(struct rwrap_fake_rr *rr,
uint8_t *answer,
size_t anslen)
unsigned char hostname_compressed[MAXDNAME];
ssize_t compressed_len;
- if (rr == NULL || rr->type != ns_t_srv) {
- RWRAP_LOG(RWRAP_LOG_ERROR,
- "Malformed record, no or wrong value!\n");
+ if (rr->type != ns_t_srv) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
return -1;
}
RWRAP_LOG(RWRAP_LOG_TRACE, "Adding SRV RR");
return resp_size;
}
+static ssize_t rwrap_fake_uri(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 uri_len;
+
+ if (rr->type != ns_t_uri) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
+ return -1;
+ }
+ RWRAP_LOG(RWRAP_LOG_TRACE, "Adding URI RR");
+ rdata_size = 3 * sizeof(uint16_t);
+ uri_len = strlen(rr->rrdata.uri_rec.uri) + 1;
+ rdata_size += uri_len;
+
+ resp_size = rwrap_fake_rdata_common(ns_t_uri, rdata_size,
+ rr->key, anslen, &a);
+ if (resp_size < 0) {
+ return -1;
+ }
+
+ NS_PUT16(rr->rrdata.uri_rec.prio, a);
+ NS_PUT16(rr->rrdata.uri_rec.weight, a);
+ memcpy(a, rr->rrdata.uri_rec.uri, uri_len);
+
+ 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)
unsigned char mailbox_compressed[MAXDNAME];
ssize_t compressed_mb_len;
- if (rr == NULL || rr->type != ns_t_soa) {
- RWRAP_LOG(RWRAP_LOG_ERROR,
- "Malformed record, no or wrong value!\n");
+ if (rr->type != ns_t_soa) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
return -1;
}
RWRAP_LOG(RWRAP_LOG_TRACE, "Adding SOA RR");
unsigned char hostname_compressed[MAXDNAME];
ssize_t rdata_size;
- if (rr == NULL || rr->type != ns_t_cname) {
- RWRAP_LOG(RWRAP_LOG_ERROR,
- "Malformed record, no or wrong value!\n");
+ if (rr->type != ns_t_cname) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
return -1;
}
RWRAP_LOG(RWRAP_LOG_TRACE, "Adding CNAME RR");
return resp_size;
}
+static ssize_t rwrap_fake_ptr(struct rwrap_fake_rr *rr,
+ uint8_t *answer,
+ size_t anslen)
+{
+ uint8_t *a = answer;
+ ssize_t rdata_size;
+ ssize_t resp_size;
+ unsigned char hostname_compressed[MAXDNAME];
+
+ if (rr->type != ns_t_ptr) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Wrong type!\n");
+ return -1;
+ }
+ RWRAP_LOG(RWRAP_LOG_TRACE, "Adding PTR RR");
+
+ /* Prepare the data to write */
+ rdata_size = ns_name_compress(rr->rrdata.ptr_rec,
+ hostname_compressed, MAXDNAME,
+ NULL, NULL);
+ if (rdata_size < 0) {
+ return -1;
+ }
+
+ resp_size = rwrap_fake_rdata_common(ns_t_ptr, rdata_size,
+ rr->key, anslen, &a);
+ if (resp_size < 0) {
+ return -1;
+ }
+
+ memcpy(a, hostname_compressed, rdata_size);
+
+ return resp_size;
+}
+
#define RESOLV_MATCH(line, name) \
(strncmp(line, name, sizeof(name) - 1) == 0 && \
(line[sizeof(name) - 1] == ' ' || \
const char *query, int type,
struct rwrap_fake_rr *rr);
+static int rwrap_uri_recurse(const char *hostfile, unsigned recursion,
+ const char *query, struct rwrap_fake_rr *rr)
+{
+ int rc;
+
+ rc = rwrap_get_record(hostfile, recursion, query, ns_t_uri, rr);
+ if (rc == ENOENT) {
+ rc = 0;
+ }
+
+ return rc;
+}
+
static int rwrap_srv_recurse(const char *hostfile, unsigned recursion,
const char *query, struct rwrap_fake_rr *rr)
{
char *key = NULL;
char *value = NULL;
int rc = ENOENT;
+ unsigned num_uris = 0;
if (recursion >= RWRAP_MAX_RECURSION) {
RWRAP_LOG(RWRAP_LOG_ERROR, "Recursed too deep!\n");
}
RWRAP_LOG(RWRAP_LOG_TRACE,
- "Searching in fake hosts file %s\n", hostfile);
+ "Searching in fake hosts file %s for %s:%d\n", hostfile,
+ query, type);
fp = fopen(hostfile, "r");
if (fp == NULL) {
- RWRAP_LOG(RWRAP_LOG_ERROR,
+ RWRAP_LOG(RWRAP_LOG_WARN,
"Opening %s failed: %s",
hostfile, strerror(errno));
return -1;
}
q[0] = '\0';
+ if (type == ns_t_uri && recursion > 0) {
+ /* Skip non-URI records. */
+ if (!TYPE_MATCH(type, ns_t_uri, rec_type, "URI", key, query)) {
+ continue;
+ }
+ /* Skip previous records based on the recurse depth. */
+ num_uris++;
+ if (num_uris <= recursion) {
+ continue;
+ }
+ }
+
if (TYPE_MATCH(type, ns_t_a, rec_type, "A", key, query)) {
rc = rwrap_create_fake_a_rr(key, value, rr);
break;
rec_type, "AAAA", key, query)) {
rc = rwrap_create_fake_aaaa_rr(key, value, rr);
break;
+ } else if (TYPE_MATCH(type, ns_t_ns,
+ rec_type, "NS", key, query)) {
+ rc = rwrap_create_fake_ns_rr(key, value, rr);
+ break;
} else if (TYPE_MATCH(type, ns_t_srv,
rec_type, "SRV", key, query)) {
rc = rwrap_create_fake_srv_rr(key, value, rr);
rr + 1);
}
break;
+ } else if (TYPE_MATCH(type, ns_t_uri,
+ rec_type, "URI", key, query)) {
+ rc = rwrap_create_fake_uri_rr(key, value, rr);
+ if (rc == 0) {
+ /* Recurse to collect multiple URI answers under a single key. */
+ rc = rwrap_uri_recurse(hostfile, recursion + 1, key, rr + 1);
+ }
+ break;
} else if (TYPE_MATCH(type, ns_t_soa,
rec_type, "SOA", key, query)) {
rc = rwrap_create_fake_soa_rr(key, value, rr);
value, rr + 1);
}
break;
+ } else if (TYPE_MATCH(type, ns_t_ptr,
+ rec_type, "PTR", key, query)) {
+ 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) {
+ if (rc == ENOENT && recursion == 0 && key != NULL) {
RWRAP_LOG(RWRAP_LOG_TRACE, "Record for [%s] not found\n", query);
memcpy(rr->key, key, strlen(key) + 1);
}
switch (type) {
case ns_t_a:
case ns_t_aaaa:
+ case ns_t_ns:
case ns_t_srv:
+ case ns_t_uri:
case ns_t_soa:
case ns_t_cname:
+ case ns_t_ptr:
+ case ns_t_txt:
return true;
}
int i;
int ancount = 0;
+ /* For URI return the number of URIs. */
+ if (qtype == ns_t_uri) {
+ for (i = 0; i < RWRAP_MAX_RECURSION; i++) {
+ if (rwrap_known_type(rrs[i].type) &&
+ rrs[i].type == qtype) {
+ ancount++;
+ }
+ }
+ return ancount;
+ }
+
/* Include all RRs in the stack until the sought type
* in the answer section. This is the case i.e. when looking
* up an A record but the name points to a CNAME
{
ssize_t resp_data;
+ if (rr == NULL) {
+ RWRAP_LOG(RWRAP_LOG_ERROR, "Internal error!\n");
+ return -1;
+ }
+
switch (rr->type) {
case ns_t_a:
resp_data = rwrap_fake_a(rr, answer, anslen);
case ns_t_aaaa:
resp_data = rwrap_fake_aaaa(rr, answer, anslen);
break;
+ case ns_t_ns:
+ resp_data = rwrap_fake_ns(rr, answer, anslen);
+ break;
case ns_t_srv:
resp_data = rwrap_fake_srv(rr, answer, anslen);
break;
+ case ns_t_uri:
+ resp_data = rwrap_fake_uri(rr, answer, anslen);
+ break;
case ns_t_soa:
resp_data = rwrap_fake_soa(rr, answer, anslen);
break;
case ns_t_cname:
resp_data = rwrap_fake_cname(rr, answer, anslen);
break;
+ 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;
}
/* Reads in a file in the following format:
* TYPE RDATA
*
- * Malformed entried are silently skipped.
+ * Malformed entries are silently skipped.
* Allocates answer buffer of size anslen that has to be freed after use.
*/
static int rwrap_res_fake_hosts(const char *hostfile,
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;
}
#include <dlfcn.h>
-struct rwrap_libc_fns {
- int (*libc_res_init)(void);
- int (*libc___res_init)(void);
- int (*libc_res_ninit)(struct __res_state *state);
- int (*libc___res_ninit)(struct __res_state *state);
- void (*libc_res_nclose)(struct __res_state *state);
- void (*libc___res_nclose)(struct __res_state *state);
- void (*libc_res_close)(void);
- void (*libc___res_close)(void);
- int (*libc_res_nquery)(struct __res_state *state,
- const char *dname,
- int class,
- int type,
- unsigned char *answer,
- int anslen);
- int (*libc___res_nquery)(struct __res_state *state,
+typedef int (*__libc_res_ninit)(struct __res_state *state);
+typedef int (*__libc___res_ninit)(struct __res_state *state);
+typedef void (*__libc_res_nclose)(struct __res_state *state);
+typedef void (*__libc___res_nclose)(struct __res_state *state);
+typedef int (*__libc_res_nquery)(struct __res_state *state,
const char *dname,
int class,
int type,
unsigned char *answer,
int anslen);
- int (*libc_res_nsearch)(struct __res_state *state,
- const char *dname,
- int class,
- int type,
- unsigned char *answer,
- int anslen);
- int (*libc___res_nsearch)(struct __res_state *state,
+typedef int (*__libc___res_nquery)(struct __res_state *state,
+ const char *dname,
+ int class,
+ int type,
+ unsigned char *answer,
+ int anslen);
+typedef int (*__libc_res_nsearch)(struct __res_state *state,
const char *dname,
int class,
int type,
unsigned char *answer,
int anslen);
+typedef int (*__libc___res_nsearch)(struct __res_state *state,
+ const char *dname,
+ int class,
+ int type,
+ unsigned char *answer,
+ int anslen);
+
+#define RWRAP_SYMBOL_ENTRY(i) \
+ union { \
+ __libc_##i f; \
+ void *obj; \
+ } _libc_##i
+
+struct rwrap_libc_symbols {
+ RWRAP_SYMBOL_ENTRY(res_ninit);
+ RWRAP_SYMBOL_ENTRY(__res_ninit);
+ RWRAP_SYMBOL_ENTRY(res_nclose);
+ RWRAP_SYMBOL_ENTRY(__res_nclose);
+ RWRAP_SYMBOL_ENTRY(res_nquery);
+ RWRAP_SYMBOL_ENTRY(__res_nquery);
+ RWRAP_SYMBOL_ENTRY(res_nsearch);
+ RWRAP_SYMBOL_ENTRY(__res_nsearch);
};
+#undef RWRAP_SYMBOL_ENTRY
struct rwrap {
- void *libc_handle;
- void *libresolv_handle;
+ struct {
+ void *handle;
+ struct rwrap_libc_symbols symbols;
+ } libc;
+
+ struct {
+ void *handle;
+ struct rwrap_libc_symbols symbols;
+ } libresolv;
bool initialised;
bool enabled;
char *socket_dir;
-
- struct rwrap_libc_fns fns;
};
static struct rwrap rwrap;
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) {
case RWRAP_LIBRESOLV:
#ifdef HAVE_LIBRESOLV
- handle = rwrap.libresolv_handle;
+ handle = rwrap.libresolv.handle;
if (handle == NULL) {
for (i = 10; i >= 0; i--) {
char soname[256] = {0};
}
}
- rwrap.libresolv_handle = handle;
+ rwrap.libresolv.handle = handle;
}
break;
#endif
/* FALL TROUGH */
case RWRAP_LIBC:
- handle = rwrap.libc_handle;
+ handle = rwrap.libc.handle;
#ifdef LIBC_SO
if (handle == NULL) {
handle = dlopen(LIBC_SO, flags);
- rwrap.libc_handle = handle;
+ rwrap.libc.handle = handle;
}
#endif
if (handle == NULL) {
}
}
- rwrap.libc_handle = handle;
+ rwrap.libc.handle = handle;
}
break;
}
if (handle == NULL) {
#ifdef RTLD_NEXT
- handle = rwrap.libc_handle = rwrap.libresolv_handle = RTLD_NEXT;
+ handle = rwrap.libc.handle = rwrap.libresolv.handle = RTLD_NEXT;
#else
RWRAP_LOG(RWRAP_LOG_ERROR,
"Failed to dlopen library: %s\n",
return handle;
}
-static void *_rwrap_load_lib_function(enum rwrap_lib lib, const char *fn_name)
+static void *_rwrap_bind_symbol(enum rwrap_lib lib, const char *fn_name)
{
void *handle;
void *func;
return func;
}
-#define rwrap_load_lib_function(lib, fn_name) \
- if (rwrap.fns.libc_##fn_name == NULL) { \
- *(void **) (&rwrap.fns.libc_##fn_name) = \
- _rwrap_load_lib_function(lib, #fn_name); \
+#define rwrap_bind_symbol_libc(sym_name) \
+ if (rwrap.libc.symbols._libc_##sym_name.obj == NULL) { \
+ rwrap.libc.symbols._libc_##sym_name.obj = \
+ _rwrap_bind_symbol(RWRAP_LIBC, #sym_name); \
+ }
+
+#define rwrap_bind_symbol_libresolv(sym_name) \
+ if (rwrap.libresolv.symbols._libc_##sym_name.obj == NULL) { \
+ rwrap.libresolv.symbols._libc_##sym_name.obj = \
+ _rwrap_bind_symbol(RWRAP_LIBRESOLV, #sym_name); \
}
/*
* has probably something todo with with the linker.
* So we need load each function at the point it is called the first time.
*/
-#if 0
-static int libc_res_init(void)
-{
-#if defined(HAVE_RES_INIT)
- rwrap_load_lib_function(RWRAP_LIBRESOLV, res_init);
-
- return rwrap.fns.libc_res_init();
-#elif defined(HAVE___RES_INIT)
- rwrap_load_lib_function(RWRAP_LIBRESOLV, __res_init);
-
- return rwrap.fns.libc___res_init();
-#endif
-}
-#endif
static int libc_res_ninit(struct __res_state *state)
{
-#if defined(HAVE_RES_NINIT)
-
-#if defined(HAVE_RES_NINIT_IN_LIBRESOLV)
- rwrap_load_lib_function(RWRAP_LIBRESOLV, res_ninit);
-#else /* HAVE_RES_NINIT_IN_LIBRESOLV */
- rwrap_load_lib_function(RWRAP_LIBC, res_ninit);
-#endif /* HAVE_RES_NINIT_IN_LIBRESOLV */
+#if !defined(res_ninit) && defined(HAVE_RES_NINIT)
+ rwrap_bind_symbol_libresolv(res_ninit);
- return rwrap.fns.libc_res_ninit(state);
+ return rwrap.libresolv.symbols._libc_res_ninit.f(state);
#elif defined(HAVE___RES_NINIT)
- rwrap_load_lib_function(RWRAP_LIBC, __res_ninit);
+ rwrap_bind_symbol_libresolv(__res_ninit);
- return rwrap.fns.libc___res_ninit(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(HAVE_RES_NCLOSE)
-
-#if defined(HAVE_RES_NCLOSE_IN_LIBRESOLV)
- rwrap_load_lib_function(RWRAP_LIBRESOLV, res_nclose);
-#else /* HAVE_RES_NCLOSE_IN_LIBRESOLV */
- rwrap_load_lib_function(RWRAP_LIBC, res_nclose);
-#endif /* HAVE_RES_NCLOSE_IN_LIBRESOLV */
+#if !defined(res_close) && defined(HAVE_RES_NCLOSE)
+ rwrap_bind_symbol_libresolv(res_nclose);
- rwrap.fns.libc_res_nclose(state);
+ rwrap.libresolv.symbols._libc_res_nclose.f(state);
+ return;
#elif defined(HAVE___RES_NCLOSE)
- rwrap_load_lib_function(RWRAP_LIBC, __res_nclose);
+ rwrap_bind_symbol_libresolv(__res_nclose);
- rwrap.fns.libc___res_nclose(state);
+ rwrap.libresolv.symbols._libc___res_nclose.f(state);
#else
#error "No res_nclose function"
#endif
unsigned char *answer,
int anslen)
{
-#if defined(HAVE_RES_NQUERY)
- rwrap_load_lib_function(RWRAP_LIBRESOLV, res_nquery);
-
- return rwrap.fns.libc_res_nquery(state,
- dname,
- class,
- type,
- answer,
- anslen);
+#if !defined(res_nquery) && defined(HAVE_RES_NQUERY)
+ rwrap_bind_symbol_libresolv(res_nquery);
+
+ return rwrap.libresolv.symbols._libc_res_nquery.f(state,
+ dname,
+ class,
+ type,
+ answer,
+ anslen);
#elif defined(HAVE___RES_NQUERY)
- rwrap_load_lib_function(RWRAP_LIBRESOLV, __res_nquery);
-
- return rwrap.fns.libc___res_nquery(state,
- dname,
- class,
- type,
- answer,
- anslen);
+ rwrap_bind_symbol_libresolv(__res_nquery);
+
+ return rwrap.libresolv.symbols._libc___res_nquery.f(state,
+ dname,
+ class,
+ type,
+ answer,
+ anslen);
#else
#error "No res_nquery function"
#endif
unsigned char *answer,
int anslen)
{
-#if defined(HAVE_RES_NSEARCH)
- rwrap_load_lib_function(RWRAP_LIBRESOLV, res_nsearch);
-
- return rwrap.fns.libc_res_nsearch(state,
- dname,
- class,
- type,
- answer,
- anslen);
+#if !defined(res_nsearch) && defined(HAVE_RES_NSEARCH)
+ rwrap_bind_symbol_libresolv(res_nsearch);
+
+ return rwrap.libresolv.symbols._libc_res_nsearch.f(state,
+ dname,
+ class,
+ type,
+ answer,
+ anslen);
#elif defined(HAVE___RES_NSEARCH)
- rwrap_load_lib_function(RWRAP_LIBRESOLV, __res_nsearch);
-
- return rwrap.fns.libc___res_nsearch(state,
- dname,
- class,
- type,
- answer,
- anslen);
+ rwrap_bind_symbol_libresolv(__res_nsearch);
+
+ return rwrap.libresolv.symbols._libc___res_nsearch.f(state,
+ dname,
+ class,
+ type,
+ answer,
+ anslen);
#else
#error "No res_nsearch function"
#endif
state->nscount = 0;
memset(state->nsaddr_list, 0, sizeof(state->nsaddr_list));
- state->_u._ext.nscount = 0;
#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]);
}
return rc;
}
-#if defined(HAVE_RES_NINIT)
+#if !defined(res_ninit) && defined(HAVE_RES_NINIT)
int res_ninit(struct __res_state *state)
#elif defined(HAVE___RES_NINIT)
int __res_ninit(struct __res_state *state)
return rc;
}
-#if defined(HAVE_RES_INIT)
+#if !defined(res_ninit) && defined(HAVE_RES_INIT)
int res_init(void)
#elif defined(HAVE___RES_INIT)
int __res_init(void)
#endif
}
-#if defined(HAVE_RES_NCLOSE)
+#if !defined(res_nclose) && defined(HAVE_RES_NCLOSE)
void res_nclose(struct __res_state *state)
#elif defined(HAVE___RES_NCLOSE)
void __res_nclose(struct __res_state *state)
return rc;
}
-#if defined(HAVE_RES_NQUERY)
+#if !defined(res_nquery) && defined(HAVE_RES_NQUERY)
int res_nquery(struct __res_state *state,
const char *dname,
int class,
return rc;
}
-#if defined(HAVE_RES_QUERY)
+#if !defined(res_query) && defined(HAVE_RES_QUERY)
int res_query(const char *dname,
int class,
int type,
return rc;
}
-#if defined(HAVE_RES_NSEARCH)
+#if !defined(res_nsearch) && defined(HAVE_RES_NSEARCH)
int res_nsearch(struct __res_state *state,
const char *dname,
int class,
}
/****************************************************************************
- * RES_QUERY
+ * RES_SEARCH
***************************************************************************/
static int rwrap_res_search(const char *dname,
return rc;
}
-#if defined(HAVE_RES_SEARCH)
+#if !defined(res_search) && defined(HAVE_RES_SEARCH)
int res_search(const char *dname,
int class,
int type,
git.samba.org / resolv_wrapper.git / blobdiff