使用 GCC 编译依赖 Open SSL 的 C 程序

Question

我必须在 linux(ubuntu) 上用 gcc 编译一个 C 程序。这取决于 openssl 库。

#include <openssl/crypto.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/bio.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/err.h>

我已经从存储库下载了 libcrypto 和 libopenssl 包。但我仍然收到此错误

root@kali:~/openssl# gcc opensslhello.c 
/tmp/ccTahV7g.o: In function `pem2X509':
opensslhello.c:(.text+0x15): undefined reference to `BIO_s_mem'
opensslhello.c:(.text+0x1d): undefined reference to `BIO_new'
opensslhello.c:(.text+0x4e): undefined reference to `BIO_write'
opensslhello.c:(.text+0x71): undefined reference to `PEM_read_bio_X509'
opensslhello.c:(.text+0x7f): undefined reference to `BIO_free'
/tmp/ccTahV7g.o: In function `sendHelloFunction':
opensslhello.c:(.text+0xb9): undefined reference to `X509_STORE_new'
opensslhello.c:(.text+0xe2): undefined reference to `X509_STORE_add_cert'
opensslhello.c:(.text+0x106): undefined reference to `X509_STORE_add_cert'
opensslhello.c:(.text+0x113): undefined reference to `sk_new_null'
opensslhello.c:(.text+0x13c): undefined reference to `sk_push'
opensslhello.c:(.text+0x160): undefined reference to `sk_push'
opensslhello.c:(.text+0x187): undefined reference to `X509_STORE_CTX_new'
opensslhello.c:(.text+0x1b0): undefined reference to `X509_STORE_CTX_init'
opensslhello.c:(.text+0x1bf): undefined reference to `X509_verify_cert'
opensslhello.c:(.text+0x1d3): undefined reference to `X509_STORE_CTX_get_error'
opensslhello.c:(.text+0x1e3): undefined reference to `X509_STORE_CTX_get_error'
opensslhello.c:(.text+0x215): undefined reference to `X509_STORE_CTX_free'
opensslhello.c:(.text+0x220): undefined reference to `X509_free'
opensslhello.c:(.text+0x22b): undefined reference to `BIO_free'
opensslhello.c:(.text+0x233): undefined reference to `X509_free'
opensslhello.c:(.text+0x23e): undefined reference to `sk_pop_free'
opensslhello.c:(.text+0x249): undefined reference to `X509_STORE_free'
/tmp/ccTahV7g.o: In function `main':
opensslhello.c:(.text+0x291): undefined reference to `EVP_cleanup'
opensslhello.c:(.text+0x29d): undefined reference to `ERR_remove_state'
opensslhello.c:(.text+0x2a2): undefined reference to `ERR_free_strings'
collect2: error: ld returned 1 exit status
root@kali:~/openssl# 

谁能告诉我应该怎么做才能摆脱这个错误？

谢谢，

Answer 1

您还没有链接 crypto 和 openssl 库:

gcc opensslhello.c -lssl -lcrypto