site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com $ cat foobar.cpp #include <openssl/dh.h> #include <openssl/asn1.h> #include <openssl/bn.h> #include <cstdio> #include <dlfcn.h> DH *dh2 = DHparams_dup(dh); dlclose(handle); return 0; } $ make foo bar baz g++ -o foo -lcrypto foobar.cpp g++ -flat_namespace -undefined suppress -bind_at_load \ -o bar foobar.cpp MACOSX_DEPLOYMENT_TARGET=10.3 g++ -undefined dynamic_lookup \ -bind_at_load -o baz foobar.cpp $ ./foo $ ./bar dyld: Symbol not found: _d2i_DHparams Referenced from: /Users/steve/temp/dlopen/./bar Expected in: flat namespace Trace/BPT trap $ ./baz dyld: Symbol not found: _d2i_DHparams Referenced from: /Users/steve/temp/dlopen/./baz Expected in: dynamic lookup Trace/BPT trap $ cat hash.cpp #include <openssl/sha.h> #include <cstdio> #include <cstring> #include <dlfcn.h> puts(hello); SHA1((unsigned char *)hello, strlen(hello), md); for(int i = 0; i < SHA_DIGEST_LENGTH; ++i) printf("%02hhx", md[i]); puts(""); dlclose(handle); return 0; } $ make hash g++ -flat_namespace -undefined suppress -bind_at_load \ -o hash hash.cpp $ ./hash Hello World! 2ef7bde608ce5404e97d5f042f95f89f1c232871 - Steve _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com I'm getting strange behavior when I try to dlopen libcrypto.dylib and then use d2i_DHparams. #ifdef DHparams_dup # undef DHparams_dup #endif #define DHparams_dup (x) \ (DH *)ASN1_dup((int (*)(...)) i2d_DHparams, \ (char *(*)(...))d2i_DHparams, (char *)(x)) int main() { void *handle = dlopen("libcrypto.dylib", RTLD_LAZY| RTLD_GLOBAL); DH *dh = DH_new(); BN_hex2bn(&dh->p, "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024" "E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD" "3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC" "6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F" "24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF"); dh->g = BN_new(); BN_set_word(dh->g, DH_GENERATOR_2); When I run ./foo it runs correctly. When I run ./bar and ./baz dyld fails with the symbol not found. However, it works with other functions such as SHA1. int main() { void *handle = dlopen("libcrypto.dylib", RTLD_LAZY| RTLD_GLOBAL); unsigned char md[SHA_DIGEST_LENGTH]; char hello[] = "Hello World!"; What is the difference between SHA1 and d2i_DHparams that would cause the first program to fail but the second one to succeed? smime.p7s