[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <errno.h>
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| 12 |
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| 13 | #include "bio_lcl.h"
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| 14 |
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| 15 | #ifndef OPENSSL_NO_SOCK
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| 16 |
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| 17 | typedef struct bio_connect_st {
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| 18 | int state;
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| 19 | int connect_family;
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| 20 | char *param_hostname;
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| 21 | char *param_service;
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| 22 | int connect_mode;
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| 23 |
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| 24 | BIO_ADDRINFO *addr_first;
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| 25 | const BIO_ADDRINFO *addr_iter;
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| 26 | /*
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| 27 | * int socket; this will be kept in bio->num so that it is compatible
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| 28 | * with the bss_sock bio
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| 29 | */
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| 30 | /*
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| 31 | * called when the connection is initially made callback(BIO,state,ret);
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| 32 | * The callback should return 'ret'. state is for compatibility with the
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| 33 | * ssl info_callback
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| 34 | */
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| 35 | int (*info_callback) (const BIO *bio, int state, int ret);
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| 36 | } BIO_CONNECT;
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| 37 |
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| 38 | static int conn_write(BIO *h, const char *buf, int num);
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| 39 | static int conn_read(BIO *h, char *buf, int size);
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| 40 | static int conn_puts(BIO *h, const char *str);
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| 41 | static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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| 42 | static int conn_new(BIO *h);
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| 43 | static int conn_free(BIO *data);
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| 44 | static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);
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| 45 |
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| 46 | static int conn_state(BIO *b, BIO_CONNECT *c);
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| 47 | static void conn_close_socket(BIO *data);
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| 48 | BIO_CONNECT *BIO_CONNECT_new(void);
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| 49 | void BIO_CONNECT_free(BIO_CONNECT *a);
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| 50 |
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| 51 | #define BIO_CONN_S_BEFORE 1
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| 52 | #define BIO_CONN_S_GET_ADDR 2
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| 53 | #define BIO_CONN_S_CREATE_SOCKET 3
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| 54 | #define BIO_CONN_S_CONNECT 4
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| 55 | #define BIO_CONN_S_OK 5
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| 56 | #define BIO_CONN_S_BLOCKED_CONNECT 6
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| 57 |
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| 58 | static const BIO_METHOD methods_connectp = {
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| 59 | BIO_TYPE_CONNECT,
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| 60 | "socket connect",
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| 61 | conn_write,
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| 62 | conn_read,
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| 63 | conn_puts,
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| 64 | NULL, /* connect_gets, */
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| 65 | conn_ctrl,
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| 66 | conn_new,
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| 67 | conn_free,
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| 68 | conn_callback_ctrl,
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| 69 | };
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| 70 |
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| 71 | static int conn_state(BIO *b, BIO_CONNECT *c)
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| 72 | {
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| 73 | int ret = -1, i;
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| 74 | int (*cb) (const BIO *, int, int) = NULL;
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| 75 |
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| 76 | if (c->info_callback != NULL)
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| 77 | cb = c->info_callback;
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| 78 |
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| 79 | for (;;) {
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| 80 | switch (c->state) {
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| 81 | case BIO_CONN_S_BEFORE:
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| 82 | if (c->param_hostname == NULL && c->param_service == NULL) {
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| 83 | BIOerr(BIO_F_CONN_STATE, BIO_R_NO_HOSTNAME_OR_SERVICE_SPECIFIED);
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| 84 | ERR_add_error_data(4,
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| 85 | "hostname=", c->param_hostname,
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| 86 | " service=", c->param_service);
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| 87 | goto exit_loop;
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| 88 | }
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| 89 | c->state = BIO_CONN_S_GET_ADDR;
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| 90 | break;
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| 91 |
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| 92 | case BIO_CONN_S_GET_ADDR:
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| 93 | {
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| 94 | int family = AF_UNSPEC;
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| 95 | switch (c->connect_family) {
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| 96 | case BIO_FAMILY_IPV6:
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| 97 | if (1) { /* This is a trick we use to avoid bit rot.
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| 98 | * at least the "else" part will always be
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| 99 | * compiled.
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| 100 | */
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| 101 | #ifdef AF_INET6
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| 102 | family = AF_INET6;
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| 103 | } else {
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| 104 | #endif
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| 105 | BIOerr(BIO_F_CONN_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
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| 106 | goto exit_loop;
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| 107 | }
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| 108 | break;
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| 109 | case BIO_FAMILY_IPV4:
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| 110 | family = AF_INET;
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| 111 | break;
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| 112 | case BIO_FAMILY_IPANY:
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| 113 | family = AF_UNSPEC;
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| 114 | break;
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| 115 | default:
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| 116 | BIOerr(BIO_F_CONN_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
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| 117 | goto exit_loop;
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| 118 | }
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| 119 | if (BIO_lookup(c->param_hostname, c->param_service,
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| 120 | BIO_LOOKUP_CLIENT,
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| 121 | family, SOCK_STREAM, &c->addr_first) == 0)
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| 122 | goto exit_loop;
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| 123 | }
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| 124 | if (c->addr_first == NULL) {
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| 125 | BIOerr(BIO_F_CONN_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
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| 126 | goto exit_loop;
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| 127 | }
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| 128 | c->addr_iter = c->addr_first;
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| 129 | c->state = BIO_CONN_S_CREATE_SOCKET;
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| 130 | break;
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| 131 |
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| 132 | case BIO_CONN_S_CREATE_SOCKET:
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| 133 | ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
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| 134 | BIO_ADDRINFO_socktype(c->addr_iter),
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| 135 | BIO_ADDRINFO_protocol(c->addr_iter), 0);
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| 136 | if (ret == (int)INVALID_SOCKET) {
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| 137 | SYSerr(SYS_F_SOCKET, get_last_socket_error());
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| 138 | ERR_add_error_data(4,
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| 139 | "hostname=", c->param_hostname,
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| 140 | " service=", c->param_service);
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| 141 | BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
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| 142 | goto exit_loop;
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| 143 | }
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| 144 | b->num = ret;
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| 145 | c->state = BIO_CONN_S_CONNECT;
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| 146 | break;
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| 147 |
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| 148 | case BIO_CONN_S_CONNECT:
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| 149 | BIO_clear_retry_flags(b);
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| 150 | ret = BIO_connect(b->num, BIO_ADDRINFO_address(c->addr_iter),
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| 151 | BIO_SOCK_KEEPALIVE | c->connect_mode);
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| 152 | b->retry_reason = 0;
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| 153 | if (ret == 0) {
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| 154 | if (BIO_sock_should_retry(ret)) {
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| 155 | BIO_set_retry_special(b);
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| 156 | c->state = BIO_CONN_S_BLOCKED_CONNECT;
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| 157 | b->retry_reason = BIO_RR_CONNECT;
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| 158 | ERR_clear_error();
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| 159 | } else if ((c->addr_iter = BIO_ADDRINFO_next(c->addr_iter))
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| 160 | != NULL) {
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| 161 | /*
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| 162 | * if there are more addresses to try, do that first
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| 163 | */
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| 164 | BIO_closesocket(b->num);
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| 165 | c->state = BIO_CONN_S_CREATE_SOCKET;
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| 166 | ERR_clear_error();
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| 167 | break;
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| 168 | } else {
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| 169 | SYSerr(SYS_F_CONNECT, get_last_socket_error());
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| 170 | ERR_add_error_data(4,
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| 171 | "hostname=", c->param_hostname,
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| 172 | " service=", c->param_service);
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| 173 | BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
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| 174 | }
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| 175 | goto exit_loop;
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| 176 | } else {
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| 177 | c->state = BIO_CONN_S_OK;
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| 178 | }
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| 179 | break;
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| 180 |
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| 181 | case BIO_CONN_S_BLOCKED_CONNECT:
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| 182 | i = BIO_sock_error(b->num);
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| 183 | if (i) {
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| 184 | BIO_clear_retry_flags(b);
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| 185 | SYSerr(SYS_F_CONNECT, i);
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| 186 | ERR_add_error_data(4,
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| 187 | "hostname=", c->param_hostname,
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| 188 | " service=", c->param_service);
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| 189 | BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
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| 190 | ret = 0;
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| 191 | goto exit_loop;
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| 192 | } else
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| 193 | c->state = BIO_CONN_S_OK;
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| 194 | break;
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| 195 |
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| 196 | case BIO_CONN_S_OK:
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| 197 | ret = 1;
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| 198 | goto exit_loop;
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| 199 | default:
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| 200 | /* abort(); */
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| 201 | goto exit_loop;
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| 202 | }
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| 203 |
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| 204 | if (cb != NULL) {
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| 205 | if ((ret = cb((BIO *)b, c->state, ret)) == 0)
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| 206 | goto end;
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| 207 | }
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| 208 | }
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| 209 |
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| 210 | /* Loop does not exit */
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| 211 | exit_loop:
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| 212 | if (cb != NULL)
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| 213 | ret = cb((BIO *)b, c->state, ret);
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| 214 | end:
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| 215 | return (ret);
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| 216 | }
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| 217 |
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| 218 | BIO_CONNECT *BIO_CONNECT_new(void)
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| 219 | {
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| 220 | BIO_CONNECT *ret;
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| 221 |
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| 222 | if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
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| 223 | return (NULL);
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| 224 | ret->state = BIO_CONN_S_BEFORE;
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| 225 | ret->connect_family = BIO_FAMILY_IPANY;
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| 226 | return (ret);
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| 227 | }
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| 228 |
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| 229 | void BIO_CONNECT_free(BIO_CONNECT *a)
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| 230 | {
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| 231 | if (a == NULL)
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| 232 | return;
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| 233 |
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| 234 | OPENSSL_free(a->param_hostname);
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| 235 | OPENSSL_free(a->param_service);
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| 236 | BIO_ADDRINFO_free(a->addr_first);
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| 237 | OPENSSL_free(a);
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| 238 | }
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| 239 |
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| 240 | const BIO_METHOD *BIO_s_connect(void)
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| 241 | {
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| 242 | return (&methods_connectp);
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| 243 | }
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| 244 |
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| 245 | static int conn_new(BIO *bi)
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| 246 | {
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| 247 | bi->init = 0;
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| 248 | bi->num = (int)INVALID_SOCKET;
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| 249 | bi->flags = 0;
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| 250 | if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
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| 251 | return (0);
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| 252 | else
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| 253 | return (1);
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| 254 | }
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| 255 |
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| 256 | static void conn_close_socket(BIO *bio)
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| 257 | {
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| 258 | BIO_CONNECT *c;
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| 259 |
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| 260 | c = (BIO_CONNECT *)bio->ptr;
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| 261 | if (bio->num != (int)INVALID_SOCKET) {
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| 262 | /* Only do a shutdown if things were established */
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| 263 | if (c->state == BIO_CONN_S_OK)
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| 264 | shutdown(bio->num, 2);
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| 265 | BIO_closesocket(bio->num);
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| 266 | bio->num = (int)INVALID_SOCKET;
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| 267 | }
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| 268 | }
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| 269 |
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| 270 | static int conn_free(BIO *a)
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| 271 | {
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| 272 | BIO_CONNECT *data;
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| 273 |
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| 274 | if (a == NULL)
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| 275 | return (0);
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| 276 | data = (BIO_CONNECT *)a->ptr;
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| 277 |
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| 278 | if (a->shutdown) {
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| 279 | conn_close_socket(a);
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| 280 | BIO_CONNECT_free(data);
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| 281 | a->ptr = NULL;
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| 282 | a->flags = 0;
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| 283 | a->init = 0;
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| 284 | }
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| 285 | return (1);
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| 286 | }
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| 287 |
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| 288 | static int conn_read(BIO *b, char *out, int outl)
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| 289 | {
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| 290 | int ret = 0;
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| 291 | BIO_CONNECT *data;
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| 292 |
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| 293 | data = (BIO_CONNECT *)b->ptr;
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| 294 | if (data->state != BIO_CONN_S_OK) {
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| 295 | ret = conn_state(b, data);
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| 296 | if (ret <= 0)
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| 297 | return (ret);
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| 298 | }
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| 299 |
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| 300 | if (out != NULL) {
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| 301 | clear_socket_error();
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| 302 | ret = readsocket(b->num, out, outl);
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| 303 | BIO_clear_retry_flags(b);
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| 304 | if (ret <= 0) {
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| 305 | if (BIO_sock_should_retry(ret))
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| 306 | BIO_set_retry_read(b);
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| 307 | }
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| 308 | }
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| 309 | return (ret);
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| 310 | }
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| 311 |
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| 312 | static int conn_write(BIO *b, const char *in, int inl)
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| 313 | {
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| 314 | int ret;
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| 315 | BIO_CONNECT *data;
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| 316 |
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| 317 | data = (BIO_CONNECT *)b->ptr;
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| 318 | if (data->state != BIO_CONN_S_OK) {
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| 319 | ret = conn_state(b, data);
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| 320 | if (ret <= 0)
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| 321 | return (ret);
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| 322 | }
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| 323 |
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| 324 | clear_socket_error();
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| 325 | ret = writesocket(b->num, in, inl);
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| 326 | BIO_clear_retry_flags(b);
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| 327 | if (ret <= 0) {
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| 328 | if (BIO_sock_should_retry(ret))
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| 329 | BIO_set_retry_write(b);
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| 330 | }
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| 331 | return (ret);
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| 332 | }
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| 333 |
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| 334 | static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
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| 335 | {
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| 336 | BIO *dbio;
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| 337 | int *ip;
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| 338 | const char **pptr = NULL;
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| 339 | long ret = 1;
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| 340 | BIO_CONNECT *data;
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| 341 |
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| 342 | data = (BIO_CONNECT *)b->ptr;
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| 343 |
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| 344 | switch (cmd) {
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| 345 | case BIO_CTRL_RESET:
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| 346 | ret = 0;
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| 347 | data->state = BIO_CONN_S_BEFORE;
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| 348 | conn_close_socket(b);
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| 349 | BIO_ADDRINFO_free(data->addr_first);
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| 350 | data->addr_first = NULL;
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| 351 | b->flags = 0;
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| 352 | break;
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| 353 | case BIO_C_DO_STATE_MACHINE:
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| 354 | /* use this one to start the connection */
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| 355 | if (data->state != BIO_CONN_S_OK)
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| 356 | ret = (long)conn_state(b, data);
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| 357 | else
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| 358 | ret = 1;
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| 359 | break;
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| 360 | case BIO_C_GET_CONNECT:
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| 361 | if (ptr != NULL) {
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| 362 | pptr = (const char **)ptr;
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| 363 | if (num == 0) {
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| 364 | *pptr = data->param_hostname;
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| 365 | } else if (num == 1) {
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| 366 | *pptr = data->param_service;
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| 367 | } else if (num == 2) {
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| 368 | *pptr = (const char *)BIO_ADDRINFO_address(data->addr_iter);
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| 369 | } else if (num == 3) {
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| 370 | switch (BIO_ADDRINFO_family(data->addr_iter)) {
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| 371 | # ifdef AF_INET6
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| 372 | case AF_INET6:
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| 373 | ret = BIO_FAMILY_IPV6;
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| 374 | break;
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| 375 | # endif
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| 376 | case AF_INET:
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| 377 | ret = BIO_FAMILY_IPV4;
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| 378 | break;
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| 379 | case 0:
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| 380 | ret = data->connect_family;
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| 381 | break;
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| 382 | default:
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| 383 | ret = -1;
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| 384 | break;
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| 385 | }
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| 386 | } else {
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| 387 | ret = 0;
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| 388 | }
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| 389 | } else {
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| 390 | ret = 0;
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| 391 | }
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| 392 | break;
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| 393 | case BIO_C_SET_CONNECT:
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| 394 | if (ptr != NULL) {
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| 395 | b->init = 1;
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| 396 | if (num == 0) {
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| 397 | char *hold_service = data->param_service;
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| 398 | /* We affect the hostname regardless. However, the input
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| 399 | * string might contain a host:service spec, so we must
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| 400 | * parse it, which might or might not affect the service
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| 401 | */
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| 402 | OPENSSL_free(data->param_hostname);
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| 403 | data->param_hostname = NULL;
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| 404 | ret = BIO_parse_hostserv(ptr,
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| 405 | &data->param_hostname,
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| 406 | &data->param_service,
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| 407 | BIO_PARSE_PRIO_HOST);
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| 408 | if (hold_service != data->param_service)
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| 409 | OPENSSL_free(hold_service);
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| 410 | } else if (num == 1) {
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| 411 | OPENSSL_free(data->param_service);
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| 412 | data->param_service = BUF_strdup(ptr);
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| 413 | } else if (num == 2) {
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| 414 | const BIO_ADDR *addr = (const BIO_ADDR *)ptr;
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| 415 | if (ret) {
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| 416 | data->param_hostname = BIO_ADDR_hostname_string(addr, 1);
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| 417 | data->param_service = BIO_ADDR_service_string(addr, 1);
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| 418 | BIO_ADDRINFO_free(data->addr_first);
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| 419 | data->addr_first = NULL;
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| 420 | data->addr_iter = NULL;
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| 421 | }
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| 422 | } else if (num == 3) {
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| 423 | data->connect_family = *(int *)ptr;
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| 424 | } else {
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| 425 | ret = 0;
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| 426 | }
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| 427 | }
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| 428 | break;
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| 429 | case BIO_C_SET_NBIO:
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| 430 | if (num != 0)
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| 431 | data->connect_mode |= BIO_SOCK_NONBLOCK;
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| 432 | else
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| 433 | data->connect_mode &= ~BIO_SOCK_NONBLOCK;
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| 434 | break;
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| 435 | case BIO_C_SET_CONNECT_MODE:
|
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| 436 | data->connect_mode = (int)num;
|
---|
| 437 | break;
|
---|
| 438 | case BIO_C_GET_FD:
|
---|
| 439 | if (b->init) {
|
---|
| 440 | ip = (int *)ptr;
|
---|
| 441 | if (ip != NULL)
|
---|
| 442 | *ip = b->num;
|
---|
| 443 | ret = b->num;
|
---|
| 444 | } else
|
---|
| 445 | ret = -1;
|
---|
| 446 | break;
|
---|
| 447 | case BIO_CTRL_GET_CLOSE:
|
---|
| 448 | ret = b->shutdown;
|
---|
| 449 | break;
|
---|
| 450 | case BIO_CTRL_SET_CLOSE:
|
---|
| 451 | b->shutdown = (int)num;
|
---|
| 452 | break;
|
---|
| 453 | case BIO_CTRL_PENDING:
|
---|
| 454 | case BIO_CTRL_WPENDING:
|
---|
| 455 | ret = 0;
|
---|
| 456 | break;
|
---|
| 457 | case BIO_CTRL_FLUSH:
|
---|
| 458 | break;
|
---|
| 459 | case BIO_CTRL_DUP:
|
---|
| 460 | {
|
---|
| 461 | dbio = (BIO *)ptr;
|
---|
| 462 | if (data->param_hostname)
|
---|
| 463 | BIO_set_conn_hostname(dbio, data->param_hostname);
|
---|
| 464 | if (data->param_service)
|
---|
| 465 | BIO_set_conn_port(dbio, data->param_service);
|
---|
| 466 | BIO_set_conn_ip_family(dbio, data->connect_family);
|
---|
| 467 | BIO_set_conn_mode(dbio, data->connect_mode);
|
---|
| 468 | /*
|
---|
| 469 | * FIXME: the cast of the function seems unlikely to be a good
|
---|
| 470 | * idea
|
---|
| 471 | */
|
---|
| 472 | (void)BIO_set_info_callback(dbio,
|
---|
| 473 | (bio_info_cb *)data->info_callback);
|
---|
| 474 | }
|
---|
| 475 | break;
|
---|
| 476 | case BIO_CTRL_SET_CALLBACK:
|
---|
| 477 | {
|
---|
| 478 | # if 0 /* FIXME: Should this be used? -- Richard
|
---|
| 479 | * Levitte */
|
---|
| 480 | BIOerr(BIO_F_CONN_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
|
---|
| 481 | ret = -1;
|
---|
| 482 | # else
|
---|
| 483 | ret = 0;
|
---|
| 484 | # endif
|
---|
| 485 | }
|
---|
| 486 | break;
|
---|
| 487 | case BIO_CTRL_GET_CALLBACK:
|
---|
| 488 | {
|
---|
| 489 | int (**fptr) (const BIO *bio, int state, int xret);
|
---|
| 490 |
|
---|
| 491 | fptr = (int (**)(const BIO *bio, int state, int xret))ptr;
|
---|
| 492 | *fptr = data->info_callback;
|
---|
| 493 | }
|
---|
| 494 | break;
|
---|
| 495 | default:
|
---|
| 496 | ret = 0;
|
---|
| 497 | break;
|
---|
| 498 | }
|
---|
| 499 | return (ret);
|
---|
| 500 | }
|
---|
| 501 |
|
---|
| 502 | static long conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
|
---|
| 503 | {
|
---|
| 504 | long ret = 1;
|
---|
| 505 | BIO_CONNECT *data;
|
---|
| 506 |
|
---|
| 507 | data = (BIO_CONNECT *)b->ptr;
|
---|
| 508 |
|
---|
| 509 | switch (cmd) {
|
---|
| 510 | case BIO_CTRL_SET_CALLBACK:
|
---|
| 511 | {
|
---|
| 512 | data->info_callback =
|
---|
| 513 | (int (*)(const struct bio_st *, int, int))fp;
|
---|
| 514 | }
|
---|
| 515 | break;
|
---|
| 516 | default:
|
---|
| 517 | ret = 0;
|
---|
| 518 | break;
|
---|
| 519 | }
|
---|
| 520 | return (ret);
|
---|
| 521 | }
|
---|
| 522 |
|
---|
| 523 | static int conn_puts(BIO *bp, const char *str)
|
---|
| 524 | {
|
---|
| 525 | int n, ret;
|
---|
| 526 |
|
---|
| 527 | n = strlen(str);
|
---|
| 528 | ret = conn_write(bp, str, n);
|
---|
| 529 | return (ret);
|
---|
| 530 | }
|
---|
| 531 |
|
---|
| 532 | BIO *BIO_new_connect(const char *str)
|
---|
| 533 | {
|
---|
| 534 | BIO *ret;
|
---|
| 535 |
|
---|
| 536 | ret = BIO_new(BIO_s_connect());
|
---|
| 537 | if (ret == NULL)
|
---|
| 538 | return (NULL);
|
---|
| 539 | if (BIO_set_conn_hostname(ret, str))
|
---|
| 540 | return (ret);
|
---|
| 541 | BIO_free(ret);
|
---|
| 542 | return (NULL);
|
---|
| 543 | }
|
---|
| 544 |
|
---|
| 545 | #endif
|
---|