RE: Problem with linking library

[Tuan Minh Nguyen]

Hi Dinh Thao,
thank you very much for your reply. I have no more problem with
linking.
but now I have problem when I compile file client.c and common.c:

[EMAIL PROTECTED]:~/SSL-connection$ gcc client.c -o client -Wall -lcrypto
-lssl -lpthread
/tmp/ccUugnSm.o: In function `main':
client.c:(.text+0xcb): undefined reference to `init_OpenSSL'
client.c:(.text+0xfc): undefined reference to `handle_error'
client.c:(.text+0x13f): undefined reference to `handle_error'
collect2: ld returned 1 exit status

Can you tell me where is problem?

Thanks, Minh. 
 ====================
Here ist relevant code:

common.h================
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/ssl.h>
#include <openssl/x509v3.h>

#ifndef WIN32
#include <pthread.h>
#define THREAD_CC
#define THREAD_TYPE                    pthread_t
#define THREAD_CREATE(tid, entry, arg) pthread_create(&(tid), NULL, \
                                                      (entry), (arg))
#else
#include <windows.h>
#define THREAD_CC                      __cdecl
#define THREAD_TYPE                    DWORD
#define THREAD_CREATE(tid, entry, arg) do { _beginthread((entry), 0,
(arg));\
                                            (tid) =
GetCurrentThreadId();   \
                                       } while (0)
#endif

#define PORT            "6001"
#define SERVER          "splat.zork.org"
#define CLIENT          "shell.zork.org"

#define int_error(msg)  handle_error(__FILE__, __LINE__, msg)
void handle_error(const char *file, int lineno, const char *msg);

void init_OpenSSL(void);

common.c==========
#include "common.h"

void handle_error(const char *file, int lineno, const char *msg)
{
    fprintf(stderr, "** %s:%i %s\n", file, lineno, msg);
    ERR_print_errors_fp(stderr);
    exit(-1);
}

void init_OpenSSL(void)
{
    if (!SSL_library_init())
    {
        fprintf(stderr, "** OpenSSL initialization failed!\n");
        exit(-1);
    }
    SSL_load_error_strings();
}

client.c============
#include "common.h"

void do_client_loop(BIO *conn)
{
    int  err, nwritten;
    char buf[80];

    for (;;)
    {
        if (!fgets(buf, sizeof(buf), stdin))
            break;
        for (nwritten = 0;  nwritten < sizeof(buf);  nwritten += err)
        {
            err = BIO_write(conn, buf + nwritten, strlen(buf) -
nwritten);
            if (err <= 0)
                return;
        }
    }
}

int main(int argc, char *argv[])
{
    BIO  *conn;

    init_OpenSSL();

    conn = BIO_new_connect(SERVER ":" PORT);
    if (!conn)
        int_error("Error creating connection BIO");

    if (BIO_do_connect(conn) <= 0)
        int_error("Error connecting to remote machine");

    fprintf(stderr, "Connection opened\n");
    do_client_loop(conn);
    fprintf(stderr, "Connection closed\n");

    BIO_free(conn);
    return 0;
}

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