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openssl/crypto/bio/bss_conn.c

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/* crypto/bio/bss_conn.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
#include "internal/cryptlib.h"
#include <openssl/bio.h>
#ifndef OPENSSL_NO_SOCK
# if (defined(OPENSSL_SYS_VMS) && __VMS_VER < 70000000)
/* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
# undef FIONBIO
# endif
typedef struct bio_connect_st {
int state;
char *param_hostname;
char *param_port;
int nbio;
unsigned char ip[4];
unsigned short port;
struct sockaddr_in them;
/*
* int socket; this will be kept in bio->num so that it is compatible
* with the bss_sock bio
*/
/*
* called when the connection is initially made callback(BIO,state,ret);
* The callback should return 'ret'. state is for compatibility with the
* ssl info_callback
*/
int (*info_callback) (const BIO *bio, int state, int ret);
} BIO_CONNECT;
static int conn_write(BIO *h, const char *buf, int num);
static int conn_read(BIO *h, char *buf, int size);
static int conn_puts(BIO *h, const char *str);
static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int conn_new(BIO *h);
static int conn_free(BIO *data);
static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);
static int conn_state(BIO *b, BIO_CONNECT *c);
static void conn_close_socket(BIO *data);
BIO_CONNECT *BIO_CONNECT_new(void);
void BIO_CONNECT_free(BIO_CONNECT *a);
static BIO_METHOD methods_connectp = {
BIO_TYPE_CONNECT,
"socket connect",
conn_write,
conn_read,
conn_puts,
NULL, /* connect_gets, */
conn_ctrl,
conn_new,
conn_free,
conn_callback_ctrl,
};
static int conn_state(BIO *b, BIO_CONNECT *c)
{
int ret = -1, i;
unsigned long l;
char *p, *q;
int (*cb) (const BIO *, int, int) = NULL;
if (c->info_callback != NULL)
cb = c->info_callback;
for (;;) {
switch (c->state) {
case BIO_CONN_S_BEFORE:
p = c->param_hostname;
if (p == NULL) {
BIOerr(BIO_F_CONN_STATE, BIO_R_NO_HOSTNAME_SPECIFIED);
goto exit_loop;
}
for (; *p != '\0'; p++) {
if ((*p == ':') || (*p == '/'))
break;
}
i = *p;
if ((i == ':') || (i == '/')) {
*(p++) = '\0';
if (i == ':') {
for (q = p; *q; q++)
if (*q == '/') {
*q = '\0';
break;
}
OPENSSL_free(c->param_port);
c->param_port = BUF_strdup(p);
}
}
if (c->param_port == NULL) {
BIOerr(BIO_F_CONN_STATE, BIO_R_NO_PORT_SPECIFIED);
ERR_add_error_data(2, "host=", c->param_hostname);
goto exit_loop;
}
c->state = BIO_CONN_S_GET_IP;
break;
case BIO_CONN_S_GET_IP:
if (BIO_get_host_ip(c->param_hostname, &(c->ip[0])) <= 0)
goto exit_loop;
c->state = BIO_CONN_S_GET_PORT;
break;
case BIO_CONN_S_GET_PORT:
if (c->param_port == NULL) {
/* abort(); */
goto exit_loop;
} else if (BIO_get_port(c->param_port, &c->port) <= 0)
goto exit_loop;
c->state = BIO_CONN_S_CREATE_SOCKET;
break;
case BIO_CONN_S_CREATE_SOCKET:
/* now setup address */
memset(&c->them, 0, sizeof(c->them));
c->them.sin_family = AF_INET;
c->them.sin_port = htons((unsigned short)c->port);
l = (unsigned long)
((unsigned long)c->ip[0] << 24L) |
((unsigned long)c->ip[1] << 16L) |
((unsigned long)c->ip[2] << 8L) | ((unsigned long)c->ip[3]);
c->them.sin_addr.s_addr = htonl(l);
c->state = BIO_CONN_S_CREATE_SOCKET;
ret = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (ret == (int)INVALID_SOCKET) {
SYSerr(SYS_F_SOCKET, get_last_socket_error());
ERR_add_error_data(4, "host=", c->param_hostname,
":", c->param_port);
BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
goto exit_loop;
}
b->num = ret;
c->state = BIO_CONN_S_NBIO;
break;
case BIO_CONN_S_NBIO:
if (c->nbio) {
if (!BIO_socket_nbio(b->num, 1)) {
BIOerr(BIO_F_CONN_STATE, BIO_R_ERROR_SETTING_NBIO);
ERR_add_error_data(4, "host=",
c->param_hostname, ":", c->param_port);
goto exit_loop;
}
}
c->state = BIO_CONN_S_CONNECT;
# if defined(SO_KEEPALIVE)
i = 1;
i = setsockopt(b->num, SOL_SOCKET, SO_KEEPALIVE, (char *)&i,
sizeof(i));
if (i < 0) {
SYSerr(SYS_F_SOCKET, get_last_socket_error());
ERR_add_error_data(4, "host=", c->param_hostname,
":", c->param_port);
BIOerr(BIO_F_CONN_STATE, BIO_R_KEEPALIVE);
goto exit_loop;
}
# endif
break;
case BIO_CONN_S_CONNECT:
BIO_clear_retry_flags(b);
ret = connect(b->num,
(struct sockaddr *)&c->them, sizeof(c->them));
b->retry_reason = 0;
if (ret < 0) {
if (BIO_sock_should_retry(ret)) {
BIO_set_retry_special(b);
c->state = BIO_CONN_S_BLOCKED_CONNECT;
b->retry_reason = BIO_RR_CONNECT;
} else {
SYSerr(SYS_F_CONNECT, get_last_socket_error());
ERR_add_error_data(4, "host=",
c->param_hostname, ":", c->param_port);
BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
}
goto exit_loop;
} else
c->state = BIO_CONN_S_OK;
break;
case BIO_CONN_S_BLOCKED_CONNECT:
i = BIO_sock_error(b->num);
if (i) {
BIO_clear_retry_flags(b);
SYSerr(SYS_F_CONNECT, i);
ERR_add_error_data(4, "host=",
c->param_hostname, ":", c->param_port);
BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
ret = 0;
goto exit_loop;
} else
c->state = BIO_CONN_S_OK;
break;
case BIO_CONN_S_OK:
ret = 1;
goto exit_loop;
default:
/* abort(); */
goto exit_loop;
}
if (cb != NULL) {
if ((ret = cb((BIO *)b, c->state, ret)) == 0)
goto end;
}
}
/* Loop does not exit */
exit_loop:
if (cb != NULL)
ret = cb((BIO *)b, c->state, ret);
end:
return (ret);
}
BIO_CONNECT *BIO_CONNECT_new(void)
{
BIO_CONNECT *ret;
if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
return (NULL);
ret->state = BIO_CONN_S_BEFORE;
ret->param_hostname = NULL;
ret->param_port = NULL;
ret->info_callback = NULL;
return (ret);
}
void BIO_CONNECT_free(BIO_CONNECT *a)
{
if (a == NULL)
return;
OPENSSL_free(a->param_hostname);
OPENSSL_free(a->param_port);
OPENSSL_free(a);
}
BIO_METHOD *BIO_s_connect(void)
{
return (&methods_connectp);
}
static int conn_new(BIO *bi)
{
bi->init = 0;
bi->num = (int)INVALID_SOCKET;
bi->flags = 0;
if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
return (0);
else
return (1);
}
static void conn_close_socket(BIO *bio)
{
BIO_CONNECT *c;
c = (BIO_CONNECT *)bio->ptr;
if (bio->num != (int)INVALID_SOCKET) {
/* Only do a shutdown if things were established */
if (c->state == BIO_CONN_S_OK)
shutdown(bio->num, 2);
closesocket(bio->num);
bio->num = (int)INVALID_SOCKET;
}
}
static int conn_free(BIO *a)
{
BIO_CONNECT *data;
if (a == NULL)
return (0);
data = (BIO_CONNECT *)a->ptr;
if (a->shutdown) {
conn_close_socket(a);
BIO_CONNECT_free(data);
a->ptr = NULL;
a->flags = 0;
a->init = 0;
}
return (1);
}
static int conn_read(BIO *b, char *out, int outl)
{
int ret = 0;
BIO_CONNECT *data;
data = (BIO_CONNECT *)b->ptr;
if (data->state != BIO_CONN_S_OK) {
ret = conn_state(b, data);
if (ret <= 0)
return (ret);
}
if (out != NULL) {
clear_socket_error();
ret = readsocket(b->num, out, outl);
BIO_clear_retry_flags(b);
if (ret <= 0) {
if (BIO_sock_should_retry(ret))
BIO_set_retry_read(b);
}
}
return (ret);
}
static int conn_write(BIO *b, const char *in, int inl)
{
int ret;
BIO_CONNECT *data;
data = (BIO_CONNECT *)b->ptr;
if (data->state != BIO_CONN_S_OK) {
ret = conn_state(b, data);
if (ret <= 0)
return (ret);
}
clear_socket_error();
ret = writesocket(b->num, in, inl);
BIO_clear_retry_flags(b);
if (ret <= 0) {
if (BIO_sock_should_retry(ret))
BIO_set_retry_write(b);
}
return (ret);
}
static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
{
BIO *dbio;
int *ip;
const char **pptr;
long ret = 1;
BIO_CONNECT *data;
data = (BIO_CONNECT *)b->ptr;
switch (cmd) {
case BIO_CTRL_RESET:
ret = 0;
data->state = BIO_CONN_S_BEFORE;
conn_close_socket(b);
b->flags = 0;
break;
case BIO_C_DO_STATE_MACHINE:
/* use this one to start the connection */
if (data->state != BIO_CONN_S_OK)
ret = (long)conn_state(b, data);
else
ret = 1;
break;
case BIO_C_GET_CONNECT:
if (ptr != NULL) {
pptr = (const char **)ptr;
if (num == 0) {
*pptr = data->param_hostname;
} else if (num == 1) {
*pptr = data->param_port;
} else if (num == 2) {
*pptr = (char *)&(data->ip[0]);
} else if (num == 3) {
*((int *)ptr) = data->port;
}
if ((!b->init) || (ptr == NULL))
*pptr = "not initialized";
ret = 1;
}
break;
case BIO_C_SET_CONNECT:
if (ptr != NULL) {
b->init = 1;
if (num == 0) {
OPENSSL_free(data->param_hostname);
data->param_hostname = BUF_strdup(ptr);
} else if (num == 1) {
OPENSSL_free(data->param_port);
data->param_port = BUF_strdup(ptr);
} else if (num == 2) {
char buf[16];
unsigned char *p = ptr;
BIO_snprintf(buf, sizeof buf, "%d.%d.%d.%d",
p[0], p[1], p[2], p[3]);
OPENSSL_free(data->param_hostname);
data->param_hostname = BUF_strdup(buf);
memcpy(&(data->ip[0]), ptr, 4);
} else if (num == 3) {
char buf[DECIMAL_SIZE(int) + 1];
BIO_snprintf(buf, sizeof buf, "%d", *(int *)ptr);
OPENSSL_free(data->param_port);
data->param_port = BUF_strdup(buf);
data->port = *(int *)ptr;
}
}
break;
case BIO_C_SET_NBIO:
data->nbio = (int)num;
break;
case BIO_C_GET_FD:
if (b->init) {
ip = (int *)ptr;
if (ip != NULL)
*ip = b->num;
ret = b->num;
} else
ret = -1;
break;
case BIO_CTRL_GET_CLOSE:
ret = b->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
b->shutdown = (int)num;
break;
case BIO_CTRL_PENDING:
case BIO_CTRL_WPENDING:
ret = 0;
break;
case BIO_CTRL_FLUSH:
break;
case BIO_CTRL_DUP:
{
dbio = (BIO *)ptr;
if (data->param_port)
BIO_set_conn_port(dbio, data->param_port);
if (data->param_hostname)
BIO_set_conn_hostname(dbio, data->param_hostname);
BIO_set_nbio(dbio, data->nbio);
/*
* FIXME: the cast of the function seems unlikely to be a good
* idea
*/
(void)BIO_set_info_callback(dbio,
(bio_info_cb *)data->info_callback);
}
break;
case BIO_CTRL_SET_CALLBACK:
{
# if 0 /* FIXME: Should this be used? -- Richard
* Levitte */
BIOerr(BIO_F_CONN_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
ret = -1;
# else
ret = 0;
# endif
}
break;
case BIO_CTRL_GET_CALLBACK:
{
int (**fptr) (const BIO *bio, int state, int xret);
fptr = (int (**)(const BIO *bio, int state, int xret))ptr;
*fptr = data->info_callback;
}
break;
default:
ret = 0;
break;
}
return (ret);
}
static long conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
{
long ret = 1;
BIO_CONNECT *data;
data = (BIO_CONNECT *)b->ptr;
switch (cmd) {
case BIO_CTRL_SET_CALLBACK:
{
data->info_callback =
(int (*)(const struct bio_st *, int, int))fp;
}
break;
default:
ret = 0;
break;
}
return (ret);
}
static int conn_puts(BIO *bp, const char *str)
{
int n, ret;
n = strlen(str);
ret = conn_write(bp, str, n);
return (ret);
}
BIO *BIO_new_connect(const char *str)
{
BIO *ret;
ret = BIO_new(BIO_s_connect());
if (ret == NULL)
return (NULL);
if (BIO_set_conn_hostname(ret, str))
return (ret);
BIO_free(ret);
return (NULL);
}
#endif
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