【求助】怎样编程实现SSL/TSL连接Gmail这样的SMTP服务器发送邮件?

[smcrescent]

RT..

另:用telnet可以连上smtp.gmail.com 587
但是到了STARTTLS以后 不管输入什么都会断开连接了
telnet不支持这种SSL/TLS连接吗?

谢谢~~

[neosu]

telnet不支持ssl。

[smcrescent]

怎样编程实现SSL/TSL连接Gmail这样的SMTP服务器发送邮件呢?谢谢~~

[smcrescent]

UP

[gel_ink]

应该查SMTP标准吧.

[kingbird]

在 winsocket 的函数调用过程中需要调用 Openssl 中的函数，来支持 SSL 连接。
SMTP 命令都是标准的命令。

[kingbird]

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


#define CHK_NULL(x) if ((x)==NULL) exit (1)
#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }

void main ()
{
int err;
int sd;
struct sockaddr_in sa;
SSL_CTX* ctx;
SSL* ssl;
X509* server_cert;
char* str;
char buf [4096];
SSL_METHOD *meth;

SSLeay_add_ssl_algorithms();
meth = SSLv2_client_method();
SSL_load_error_strings();
ctx = SSL_CTX_new (meth); CHK_NULL(ctx);

CHK_SSL(err);

/* ----------------------------------------------- */
/* Create a socket and connect to server using normal socket calls. */

sd = socket (AF_INET, SOCK_STREAM, 0); CHK_ERR(sd, "socket");

memset (&sa, '\0', sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr ("127.0.0.1"); /* Server IP */
sa.sin_port = htons (1111); /* Server Port number */

err = connect(sd, (struct sockaddr*) &sa,
sizeof(sa)); CHK_ERR(err, "connect");

/* ----------------------------------------------- */
/* Now we have TCP conncetion. Start SSL negotiation. */

ssl = SSL_new (ctx); CHK_NULL(ssl);
SSL_set_fd (ssl, sd);
err = SSL_connect (ssl); CHK_SSL(err);

/* Following two steps are optional and not required for
data exchange to be successful. */

/* Get the cipher - opt */

printf ("SSL connection using %s\n", SSL_get_cipher (ssl));

/* Get server's certificate (note: beware of dynamic allocation) - opt */

server_cert = SSL_get_peer_certificate (ssl); CHK_NULL(server_cert);
printf ("Server certificate:\n");

str = X509_NAME_oneline (X509_get_subject_name (server_cert),0,0);
CHK_NULL(str);
printf ("\t subject: %s\n", str);
OPENSSL_free (str);

str = X509_NAME_oneline (X509_get_issuer_name (server_cert),0,0);
CHK_NULL(str);
printf ("\t issuer: %s\n", str);
OPENSSL_free (str);

/* We could do all sorts of certificate verification stuff here before
deallocating the certificate. */

X509_free (server_cert);

/* --------------------------------------------------- */
/* DATA EXCHANGE - Send a message and receive a reply. */

err = SSL_write (ssl, "Hello World!", strlen("Hello World!")); CHK_SSL(err);

err = SSL_read (ssl, buf, sizeof(buf) - 1); CHK_SSL(err);
buf[err] = '\0';
printf ("Got %d chars:'%s'\n", err, buf);
SSL_shutdown (ssl); /* send SSL/TLS close_notify */

/* Clean up. */

close (sd);
SSL_free (ssl);
SSL_CTX_free (ctx);
}

[CathySun118]

http://www.yesky.com/20021119/1640691.shtml