Add __attribute__((warn_unused_result)) to crypto functions.

diff --git a/configure.ac b/configure.ac
index 5f6bfec..1cea02f 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -156,6 +156,7 @@ AC_HEADER_TIME
 AC_STRUCT_TM
 
 tinc_ATTRIBUTE(__malloc__)
+tinc_ATTRIBUTE(__warn_unused_result__)
 
 AC_CHECK_TYPES([socklen_t, struct ether_header, struct arphdr, struct ether_arp, struct in_addr, struct addrinfo, struct ip, struct icmp, struct in6_addr, struct sockaddr_in6, struct ip6_hdr, struct icmp6_hdr, struct nd_neighbor_solicit, struct nd_opt_hdr], , ,
   [#include "src/have.h"]

diff --git a/src/cipher.h b/src/cipher.h
index c586fff..17ca614 100644 (file)
--- a/src/cipher.h
+++ b/src/cipher.h
@@ -32,15 +32,14 @@ extern cipher_t *cipher_open_blowfish_ofb(void) __attribute__ ((__malloc__));
 extern void cipher_close(cipher_t *);
 extern size_t cipher_keylength(const cipher_t *);
 extern void cipher_get_key(const cipher_t *, void *);
-extern bool cipher_set_key(cipher_t *, void *, bool);
-extern bool cipher_set_key_from_rsa(cipher_t *, void *, size_t, bool);
-extern bool cipher_set_counter(cipher_t *, const void *, size_t);
-extern bool cipher_set_counter_key(cipher_t *, void *);
-extern bool cipher_encrypt(cipher_t *, const void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot);
-extern bool cipher_decrypt(cipher_t *, const void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot);
-extern bool cipher_counter_xor(cipher_t *, const void *indata, size_t inlen, void *outdata);
+extern bool cipher_set_key(cipher_t *, void *, bool) __attribute__ ((__warn_unused_result__));
+extern bool cipher_set_key_from_rsa(cipher_t *, void *, size_t, bool) __attribute__ ((__warn_unused_result__));
+extern bool cipher_set_counter(cipher_t *, const void *, size_t) __attribute__ ((__warn_unused_result__));
+extern bool cipher_set_counter_key(cipher_t *, void *) __attribute__ ((__warn_unused_result__));
+extern bool cipher_encrypt(cipher_t *, const void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot) __attribute__ ((__warn_unused_result__));
+extern bool cipher_decrypt(cipher_t *, const void *indata, size_t inlen, void *outdata, size_t *outlen, bool oneshot) __attribute__ ((__warn_unused_result__));
+extern bool cipher_counter_xor(cipher_t *, const void *indata, size_t inlen, void *outdata) __attribute__ ((__warn_unused_result__));
 extern int cipher_get_nid(const cipher_t *);
 extern bool cipher_active(const cipher_t *);
 
-
 #endif

diff --git a/src/digest.h b/src/digest.h
index bd9e587..1e14945 100644 (file)
--- a/src/digest.h
+++ b/src/digest.h
@@ -28,9 +28,9 @@ extern digest_t *digest_open_by_name(const char *name, int maclength) __attribut
 extern digest_t *digest_open_by_nid(int nid, int maclength) __attribute__ ((__malloc__));
 extern digest_t *digest_open_sha1(int maclength) __attribute__ ((__malloc__));
 extern void digest_close(digest_t *);
-extern bool digest_create(digest_t *, const void *indata, size_t inlen, void *outdata);
-extern bool digest_verify(digest_t *, const void *indata, size_t inlen, const void *digestdata);
-extern bool digest_set_key(digest_t *, const void *key, size_t len);
+extern bool digest_create(digest_t *, const void *indata, size_t inlen, void *outdata) __attribute__ ((__warn_unused_result__));
+extern bool digest_verify(digest_t *, const void *indata, size_t inlen, const void *digestdata) __attribute__ ((__warn_unused_result__));
+extern bool digest_set_key(digest_t *, const void *key, size_t len) __attribute__ ((__warn_unused_result__));
 extern int digest_get_nid(const digest_t *);
 extern size_t digest_keylength(const digest_t *);
 extern size_t digest_length(const digest_t *);

diff --git a/src/ecdh.h b/src/ecdh.h
index 881ee92..fbd4729 100644 (file)
--- a/src/ecdh.h
+++ b/src/ecdh.h
@@ -28,7 +28,7 @@ typedef struct ecdh ecdh_t;
 #endif
 
 extern ecdh_t *ecdh_generate_public(void *pubkey) __attribute__ ((__malloc__));
-extern bool ecdh_compute_shared(ecdh_t *ecdh, const void *pubkey, void *shared);
+extern bool ecdh_compute_shared(ecdh_t *ecdh, const void *pubkey, void *shared) __attribute__ ((__warn_unused_result__));
 extern void ecdh_free(ecdh_t *ecdh);
 
 #endif

diff --git a/src/ecdsa.h b/src/ecdsa.h
index 9561239..d03a58e 100644 (file)
--- a/src/ecdsa.h
+++ b/src/ecdsa.h
@@ -29,8 +29,8 @@ extern char *ecdsa_get_base64_public_key(ecdsa_t *ecdsa);
 extern ecdsa_t *ecdsa_read_pem_public_key(FILE *fp) __attribute__ ((__malloc__));
 extern ecdsa_t *ecdsa_read_pem_private_key(FILE *fp) __attribute__ ((__malloc__));
 extern size_t ecdsa_size(ecdsa_t *ecdsa);
-extern bool ecdsa_sign(ecdsa_t *ecdsa, const void *in, size_t inlen, void *out);
-extern bool ecdsa_verify(ecdsa_t *ecdsa, const void *in, size_t inlen, const void *out);
+extern bool ecdsa_sign(ecdsa_t *ecdsa, const void *in, size_t inlen, void *out) __attribute__ ((__warn_unused_result__));
+extern bool ecdsa_verify(ecdsa_t *ecdsa, const void *in, size_t inlen, const void *out) __attribute__ ((__warn_unused_result__));
 extern bool ecdsa_active(ecdsa_t *ecdsa);
 extern void ecdsa_free(ecdsa_t *ecdsa);
 

diff --git a/src/ecdsagen.h b/src/ecdsagen.h
index 621913b..12e5c00 100644 (file)
--- a/src/ecdsagen.h
+++ b/src/ecdsagen.h
@@ -23,7 +23,7 @@
 #include "ecdsa.h"
 
 extern ecdsa_t *ecdsa_generate(void) __attribute__ ((__malloc__));
-extern bool ecdsa_write_pem_public_key(ecdsa_t *ecdsa, FILE *fp);
-extern bool ecdsa_write_pem_private_key(ecdsa_t *ecdsa, FILE *fp);
+extern bool ecdsa_write_pem_public_key(ecdsa_t *ecdsa, FILE *fp) __attribute__ ((__warn_unused_result__));
+extern bool ecdsa_write_pem_private_key(ecdsa_t *ecdsa, FILE *fp) __attribute__ ((__warn_unused_result__));
 
 #endif

diff --git a/src/prf.h b/src/prf.h
index f7ecc64..ef4b99b 100644 (file)
--- a/src/prf.h
+++ b/src/prf.h
@@ -20,6 +20,6 @@
 #ifndef __TINC_PRF_H__
 #define __TINC_PRF_H__
 
-extern bool prf(const char *secret, size_t secretlen, char *seed, size_t seedlen, char *out, size_t outlen);
+extern bool prf(const char *secret, size_t secretlen, char *seed, size_t seedlen, char *out, size_t outlen) __attribute__ ((__warn_unused_result__));
 
 #endif

diff --git a/src/rsa.h b/src/rsa.h
index 64344b7..f4290d4 100644 (file)
--- a/src/rsa.h
+++ b/src/rsa.h
@@ -30,7 +30,7 @@ extern rsa_t *rsa_set_hex_private_key(char *n, char *e, char *d) __attribute__ (
 extern rsa_t *rsa_read_pem_public_key(FILE *fp) __attribute__ ((__malloc__));
 extern rsa_t *rsa_read_pem_private_key(FILE *fp) __attribute__ ((__malloc__));
 extern size_t rsa_size(rsa_t *rsa);
-extern bool rsa_public_encrypt(rsa_t *rsa, void *in, size_t len, void *out);
-extern bool rsa_private_decrypt(rsa_t *rsa, void *in, size_t len, void *out);
+extern bool rsa_public_encrypt(rsa_t *rsa, void *in, size_t len, void *out) __attribute__ ((__warn_unused_result__));
+extern bool rsa_private_decrypt(rsa_t *rsa, void *in, size_t len, void *out) __attribute__ ((__warn_unused_result__));
 
 #endif

diff --git a/src/rsagen.h b/src/rsagen.h
index 84cd0bb..58ce29f 100644 (file)
--- a/src/rsagen.h
+++ b/src/rsagen.h
@@ -23,7 +23,7 @@
 #include "rsa.h"
 
 extern rsa_t *rsa_generate(size_t bits, unsigned long exponent) __attribute__ ((__malloc__));
-extern bool rsa_write_pem_public_key(rsa_t *rsa, FILE *fp);
-extern bool rsa_write_pem_private_key(rsa_t *rsa, FILE *fp);
+extern bool rsa_write_pem_public_key(rsa_t *rsa, FILE *fp) __attribute__ ((__warn_unused_result__));
+extern bool rsa_write_pem_private_key(rsa_t *rsa, FILE *fp) __attribute__ ((__warn_unused_result__));
 
 #endif