600 lines
14 KiB
C
Executable file
600 lines
14 KiB
C
Executable file
/* $OpenBSD: bss_conn.c,v 1.35 2018/05/12 18:51:59 tb Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <openssl/bio.h>
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#include <openssl/buffer.h>
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#include <openssl/err.h>
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#define SOCKET_PROTOCOL IPPROTO_TCP
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typedef struct bio_connect_st {
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int state;
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char *param_hostname;
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char *param_port;
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int nbio;
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unsigned char ip[4];
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unsigned short port;
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struct sockaddr_in them;
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/* int socket; this will be kept in bio->num so that it is
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* compatible with the bss_sock bio */
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/* called when the connection is initially made
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* callback(BIO,state,ret); The callback should return
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* 'ret'. state is for compatibility with the ssl info_callback */
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int (*info_callback)(const BIO *bio, int state, int ret);
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} BIO_CONNECT;
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static int conn_write(BIO *h, const char *buf, int num);
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static int conn_read(BIO *h, char *buf, int size);
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static int conn_puts(BIO *h, const char *str);
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static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int conn_new(BIO *h);
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static int conn_free(BIO *data);
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static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);
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static int conn_state(BIO *b, BIO_CONNECT *c);
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static void conn_close_socket(BIO *data);
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BIO_CONNECT *BIO_CONNECT_new(void);
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void BIO_CONNECT_free(BIO_CONNECT *a);
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static const BIO_METHOD methods_connectp = {
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.type = BIO_TYPE_CONNECT,
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.name = "socket connect",
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.bwrite = conn_write,
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.bread = conn_read,
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.bputs = conn_puts,
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.ctrl = conn_ctrl,
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.create = conn_new,
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.destroy = conn_free,
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.callback_ctrl = conn_callback_ctrl
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};
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static int
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conn_state(BIO *b, BIO_CONNECT *c)
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{
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int ret = -1, i;
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unsigned long l;
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char *p, *q;
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int (*cb)(const BIO *, int, int) = NULL;
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if (c->info_callback != NULL)
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cb = c->info_callback;
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for (;;) {
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switch (c->state) {
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case BIO_CONN_S_BEFORE:
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p = c->param_hostname;
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if (p == NULL) {
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BIOerror(BIO_R_NO_HOSTNAME_SPECIFIED);
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goto exit_loop;
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}
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for (; *p != '\0'; p++) {
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if ((*p == ':') || (*p == '/'))
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break;
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}
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i= *p;
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if ((i == ':') || (i == '/')) {
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*(p++) = '\0';
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if (i == ':') {
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for (q = p; *q; q++)
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if (*q == '/') {
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*q = '\0';
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break;
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}
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free(c->param_port);
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c->param_port = strdup(p);
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}
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}
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if (c->param_port == NULL) {
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BIOerror(BIO_R_NO_PORT_SPECIFIED);
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ERR_asprintf_error_data("host=%s",
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c->param_hostname);
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goto exit_loop;
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}
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c->state = BIO_CONN_S_GET_IP;
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break;
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case BIO_CONN_S_GET_IP:
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if (BIO_get_host_ip(c->param_hostname, &(c->ip[0])) <= 0)
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goto exit_loop;
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c->state = BIO_CONN_S_GET_PORT;
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break;
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case BIO_CONN_S_GET_PORT:
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if (c->param_port == NULL) {
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/* abort(); */
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goto exit_loop;
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} else if (BIO_get_port(c->param_port, &c->port) <= 0)
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goto exit_loop;
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c->state = BIO_CONN_S_CREATE_SOCKET;
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break;
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case BIO_CONN_S_CREATE_SOCKET:
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/* now setup address */
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memset((char *)&c->them, 0, sizeof(c->them));
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c->them.sin_family = AF_INET;
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c->them.sin_port = htons((unsigned short)c->port);
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l = (unsigned long)
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((unsigned long)c->ip[0] << 24L)|
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((unsigned long)c->ip[1] << 16L)|
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((unsigned long)c->ip[2] << 8L)|
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((unsigned long)c->ip[3]);
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c->them.sin_addr.s_addr = htonl(l);
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c->state = BIO_CONN_S_CREATE_SOCKET;
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ret = socket(AF_INET, SOCK_STREAM, SOCKET_PROTOCOL);
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if (ret == -1) {
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SYSerror(errno);
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ERR_asprintf_error_data("host=%s:%s",
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c->param_hostname, c->param_port);
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BIOerror(BIO_R_UNABLE_TO_CREATE_SOCKET);
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goto exit_loop;
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}
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b->num = ret;
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c->state = BIO_CONN_S_NBIO;
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break;
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case BIO_CONN_S_NBIO:
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if (c->nbio) {
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if (!BIO_socket_nbio(b->num, 1)) {
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BIOerror(BIO_R_ERROR_SETTING_NBIO);
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ERR_asprintf_error_data("host=%s:%s",
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c->param_hostname, c->param_port);
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goto exit_loop;
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}
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}
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c->state = BIO_CONN_S_CONNECT;
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#if defined(SO_KEEPALIVE)
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i = 1;
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i = setsockopt(b->num, SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i));
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if (i < 0) {
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SYSerror(errno);
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ERR_asprintf_error_data("host=%s:%s",
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c->param_hostname, c->param_port);
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BIOerror(BIO_R_KEEPALIVE);
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goto exit_loop;
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}
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#endif
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break;
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case BIO_CONN_S_CONNECT:
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BIO_clear_retry_flags(b);
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ret = connect(b->num,
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(struct sockaddr *)&c->them,
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sizeof(c->them));
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b->retry_reason = 0;
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if (ret < 0) {
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if (BIO_sock_should_retry(ret)) {
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BIO_set_retry_special(b);
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c->state = BIO_CONN_S_BLOCKED_CONNECT;
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b->retry_reason = BIO_RR_CONNECT;
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} else {
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SYSerror(errno);
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ERR_asprintf_error_data("host=%s:%s",
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c->param_hostname, c->param_port);
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BIOerror(BIO_R_CONNECT_ERROR);
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}
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goto exit_loop;
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} else
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c->state = BIO_CONN_S_OK;
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break;
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case BIO_CONN_S_BLOCKED_CONNECT:
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i = BIO_sock_error(b->num);
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if (i) {
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BIO_clear_retry_flags(b);
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SYSerror(i);
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ERR_asprintf_error_data("host=%s:%s",
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c->param_hostname, c->param_port);
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BIOerror(BIO_R_NBIO_CONNECT_ERROR);
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ret = 0;
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goto exit_loop;
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} else
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c->state = BIO_CONN_S_OK;
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break;
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case BIO_CONN_S_OK:
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ret = 1;
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goto exit_loop;
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default:
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/* abort(); */
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goto exit_loop;
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}
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if (cb != NULL) {
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if (!(ret = cb((BIO *)b, c->state, ret)))
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goto end;
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}
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}
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/* Loop does not exit */
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exit_loop:
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if (cb != NULL)
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ret = cb((BIO *)b, c->state, ret);
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end:
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return (ret);
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}
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BIO_CONNECT *
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BIO_CONNECT_new(void)
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{
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BIO_CONNECT *ret;
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if ((ret = malloc(sizeof(BIO_CONNECT))) == NULL)
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return (NULL);
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ret->state = BIO_CONN_S_BEFORE;
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ret->param_hostname = NULL;
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ret->param_port = NULL;
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ret->info_callback = NULL;
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ret->nbio = 0;
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ret->ip[0] = 0;
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ret->ip[1] = 0;
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ret->ip[2] = 0;
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ret->ip[3] = 0;
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ret->port = 0;
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memset((char *)&ret->them, 0, sizeof(ret->them));
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return (ret);
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}
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void
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BIO_CONNECT_free(BIO_CONNECT *a)
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{
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if (a == NULL)
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return;
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free(a->param_hostname);
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free(a->param_port);
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free(a);
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}
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const BIO_METHOD *
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BIO_s_connect(void)
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{
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return (&methods_connectp);
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}
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static int
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conn_new(BIO *bi)
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{
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bi->init = 0;
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bi->num = -1;
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bi->flags = 0;
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if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
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return (0);
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else
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return (1);
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}
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static void
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conn_close_socket(BIO *bio)
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{
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BIO_CONNECT *c;
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c = (BIO_CONNECT *)bio->ptr;
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if (bio->num != -1) {
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/* Only do a shutdown if things were established */
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if (c->state == BIO_CONN_S_OK)
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shutdown(bio->num, SHUT_RDWR);
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close(bio->num);
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bio->num = -1;
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}
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}
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static int
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conn_free(BIO *a)
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{
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BIO_CONNECT *data;
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if (a == NULL)
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return (0);
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data = (BIO_CONNECT *)a->ptr;
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if (a->shutdown) {
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conn_close_socket(a);
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BIO_CONNECT_free(data);
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a->ptr = NULL;
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a->flags = 0;
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a->init = 0;
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}
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return (1);
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}
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static int
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conn_read(BIO *b, char *out, int outl)
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{
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int ret = 0;
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BIO_CONNECT *data;
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data = (BIO_CONNECT *)b->ptr;
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if (data->state != BIO_CONN_S_OK) {
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ret = conn_state(b, data);
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if (ret <= 0)
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return (ret);
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}
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if (out != NULL) {
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errno = 0;
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ret = read(b->num, out, outl);
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BIO_clear_retry_flags(b);
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if (ret <= 0) {
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if (BIO_sock_should_retry(ret))
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BIO_set_retry_read(b);
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}
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}
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return (ret);
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}
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static int
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conn_write(BIO *b, const char *in, int inl)
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{
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int ret;
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BIO_CONNECT *data;
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data = (BIO_CONNECT *)b->ptr;
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if (data->state != BIO_CONN_S_OK) {
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ret = conn_state(b, data);
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if (ret <= 0)
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return (ret);
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}
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errno = 0;
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ret = write(b->num, in, inl);
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BIO_clear_retry_flags(b);
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if (ret <= 0) {
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if (BIO_sock_should_retry(ret))
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BIO_set_retry_write(b);
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}
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return (ret);
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}
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static long
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conn_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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BIO *dbio;
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int *ip;
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const char **pptr;
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long ret = 1;
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BIO_CONNECT *data;
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data = (BIO_CONNECT *)b->ptr;
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switch (cmd) {
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case BIO_CTRL_RESET:
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ret = 0;
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data->state = BIO_CONN_S_BEFORE;
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conn_close_socket(b);
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b->flags = 0;
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break;
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case BIO_C_DO_STATE_MACHINE:
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/* use this one to start the connection */
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if (data->state != BIO_CONN_S_OK)
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ret = (long)conn_state(b, data);
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else
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ret = 1;
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break;
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case BIO_C_GET_CONNECT:
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if (ptr != NULL) {
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pptr = (const char **)ptr;
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if (num == 0) {
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*pptr = data->param_hostname;
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} else if (num == 1) {
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*pptr = data->param_port;
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} else if (num == 2) {
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*pptr = (char *)&(data->ip[0]);
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} else if (num == 3) {
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*((int *)ptr) = data->port;
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}
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if ((!b->init) || (ptr == NULL))
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*pptr = "not initialized";
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ret = 1;
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}
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break;
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case BIO_C_SET_CONNECT:
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if (ptr != NULL) {
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b->init = 1;
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if (num == 0) {
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free(data->param_hostname);
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data->param_hostname = strdup(ptr);
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} else if (num == 1) {
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free(data->param_port);
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data->param_port = strdup(ptr);
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} else if (num == 2) {
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unsigned char *p = ptr;
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free(data->param_hostname);
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if (asprintf(&data->param_hostname,
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"%u.%u.%u.%u", p[0], p[1],
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p[2], p[3]) == -1)
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data->param_hostname = NULL;
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memcpy(&(data->ip[0]), ptr, 4);
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} else if (num == 3) {
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free(data->param_port);
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data->port= *(int *)ptr;
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if (asprintf(&data->param_port, "%d",
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data->port) == -1)
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data->param_port = NULL;
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}
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}
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break;
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case BIO_C_SET_NBIO:
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data->nbio = (int)num;
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break;
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case BIO_C_GET_FD:
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if (b->init) {
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ip = (int *)ptr;
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if (ip != NULL)
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*ip = b->num;
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ret = b->num;
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} else
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ret = -1;
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break;
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case BIO_CTRL_GET_CLOSE:
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ret = b->shutdown;
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break;
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case BIO_CTRL_SET_CLOSE:
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b->shutdown = (int)num;
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break;
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case BIO_CTRL_PENDING:
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case BIO_CTRL_WPENDING:
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ret = 0;
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break;
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case BIO_CTRL_FLUSH:
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break;
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case BIO_CTRL_DUP:
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{
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dbio = (BIO *)ptr;
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if (data->param_port)
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BIO_set_conn_port(dbio, data->param_port);
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if (data->param_hostname)
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BIO_set_conn_hostname(dbio,
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data->param_hostname);
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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 */
|
|
BIOerror(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);
|
|
else {
|
|
BIO_free(ret);
|
|
return (NULL);
|
|
}
|
|
}
|
|
|