[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 | /* socket-related functions used by s_client and s_server */
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| 11 | #include <stdio.h>
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| 12 | #include <stdlib.h>
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| 13 | #include <string.h>
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| 14 | #include <errno.h>
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| 15 | #include <signal.h>
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| 16 | #include <openssl/opensslconf.h>
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| 17 |
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| 18 | /*
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| 19 | * With IPv6, it looks like Digital has mixed up the proper order of
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| 20 | * recursive header file inclusion, resulting in the compiler complaining
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| 21 | * that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which is
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| 22 | * needed to have fileno() declared correctly... So let's define u_int
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| 23 | */
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| 24 | #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
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| 25 | # define __U_INT
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| 26 | typedef unsigned int u_int;
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| 27 | #endif
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| 28 |
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| 29 | #ifndef OPENSSL_NO_SOCK
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| 30 |
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| 31 | # define USE_SOCKETS
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| 32 | # include "apps.h"
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| 33 | # undef USE_SOCKETS
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| 34 | # include "s_apps.h"
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| 35 |
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| 36 | # include <openssl/bio.h>
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| 37 | # include <openssl/err.h>
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| 38 |
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| 39 | /*
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| 40 | * init_client - helper routine to set up socket communication
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| 41 | * @sock: pointer to storage of resulting socket.
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| 42 | * @host: the host name or path (for AF_UNIX) to connect to.
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| 43 | * @port: the port to connect to (ignored for AF_UNIX).
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| 44 | * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
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| 45 | * AF_UNSPEC
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| 46 | * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
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| 47 | *
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| 48 | * This will create a socket and use it to connect to a host:port, or if
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| 49 | * family == AF_UNIX, to the path found in host.
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| 50 | *
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| 51 | * If the host has more than one address, it will try them one by one until
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| 52 | * a successful connection is established. The resulting socket will be
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| 53 | * found in *sock on success, it will be given INVALID_SOCKET otherwise.
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| 54 | *
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| 55 | * Returns 1 on success, 0 on failure.
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| 56 | */
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| 57 | int init_client(int *sock, const char *host, const char *port,
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| 58 | int family, int type)
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| 59 | {
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| 60 | BIO_ADDRINFO *res = NULL;
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| 61 | const BIO_ADDRINFO *ai = NULL;
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| 62 | int ret;
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| 63 |
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| 64 | if (!BIO_sock_init())
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| 65 | return 0;
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| 66 |
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| 67 | ret = BIO_lookup(host, port, BIO_LOOKUP_CLIENT, family, type, &res);
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| 68 | if (ret == 0) {
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| 69 | ERR_print_errors(bio_err);
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| 70 | return 0;
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| 71 | }
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| 72 |
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| 73 | ret = 0;
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| 74 | for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) {
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| 75 | /* Admittedly, these checks are quite paranoid, we should not get
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| 76 | * anything in the BIO_ADDRINFO chain that we haven't
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| 77 | * asked for. */
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| 78 | OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
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| 79 | && (type == 0 || type == BIO_ADDRINFO_socktype(res)));
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| 80 |
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| 81 | *sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai),
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| 82 | BIO_ADDRINFO_protocol(res), 0);
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| 83 | if (*sock == INVALID_SOCKET) {
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| 84 | /* Maybe the kernel doesn't support the socket family, even if
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| 85 | * BIO_lookup() added it in the returned result...
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| 86 | */
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| 87 | continue;
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| 88 | }
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| 89 | if (!BIO_connect(*sock, BIO_ADDRINFO_address(ai), 0)) {
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| 90 | BIO_closesocket(*sock);
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| 91 | *sock = INVALID_SOCKET;
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| 92 | continue;
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| 93 | }
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| 94 |
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| 95 | /* Success, don't try any more addresses */
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| 96 | break;
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| 97 | }
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| 98 |
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| 99 | if (*sock == INVALID_SOCKET) {
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| 100 | ERR_print_errors(bio_err);
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| 101 | } else {
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| 102 | /* Remove any stale errors from previous connection attempts */
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| 103 | ERR_clear_error();
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| 104 | ret = 1;
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| 105 | }
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| 106 | BIO_ADDRINFO_free(res);
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| 107 | return ret;
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| 108 | }
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| 109 |
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| 110 | /*
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| 111 | * do_server - helper routine to perform a server operation
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| 112 | * @accept_sock: pointer to storage of resulting socket.
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| 113 | * @host: the host name or path (for AF_UNIX) to connect to.
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| 114 | * @port: the port to connect to (ignored for AF_UNIX).
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| 115 | * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
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| 116 | * AF_UNSPEC
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| 117 | * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
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| 118 | * @cb: pointer to a function that receives the accepted socket and
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| 119 | * should perform the communication with the connecting client.
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| 120 | * @context: pointer to memory that's passed verbatim to the cb function.
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| 121 | * @naccept: number of times an incoming connect should be accepted. If -1,
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| 122 | * unlimited number.
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| 123 | *
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| 124 | * This will create a socket and use it to listen to a host:port, or if
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| 125 | * family == AF_UNIX, to the path found in host, then start accepting
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| 126 | * incoming connections and run cb on the resulting socket.
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| 127 | *
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| 128 | * 0 on failure, something other on success.
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| 129 | */
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| 130 | int do_server(int *accept_sock, const char *host, const char *port,
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| 131 | int family, int type, do_server_cb cb,
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| 132 | unsigned char *context, int naccept)
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| 133 | {
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| 134 | int asock = 0;
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| 135 | int sock;
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| 136 | int i;
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| 137 | BIO_ADDRINFO *res = NULL;
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| 138 | int ret = 0;
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| 139 |
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| 140 | if (!BIO_sock_init())
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| 141 | return 0;
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| 142 |
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| 143 | if (!BIO_lookup(host, port, BIO_LOOKUP_SERVER, family, type, &res)) {
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| 144 | ERR_print_errors(bio_err);
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| 145 | return 0;
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| 146 | }
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| 147 |
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| 148 | /* Admittedly, these checks are quite paranoid, we should not get
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| 149 | * anything in the BIO_ADDRINFO chain that we haven't asked for */
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| 150 | OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
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| 151 | && (type == 0 || type == BIO_ADDRINFO_socktype(res)));
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| 152 |
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| 153 | asock = BIO_socket(BIO_ADDRINFO_family(res), BIO_ADDRINFO_socktype(res),
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| 154 | BIO_ADDRINFO_protocol(res), 0);
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| 155 | if (asock == INVALID_SOCKET
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| 156 | || !BIO_listen(asock, BIO_ADDRINFO_address(res), BIO_SOCK_REUSEADDR)) {
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| 157 | BIO_ADDRINFO_free(res);
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| 158 | ERR_print_errors(bio_err);
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| 159 | if (asock != INVALID_SOCKET)
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| 160 | BIO_closesocket(asock);
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| 161 | goto end;
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| 162 | }
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| 163 |
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| 164 | BIO_ADDRINFO_free(res);
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| 165 | res = NULL;
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| 166 |
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| 167 | if (accept_sock != NULL)
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| 168 | *accept_sock = asock;
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| 169 | for (;;) {
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| 170 | if (type == SOCK_STREAM) {
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| 171 | do {
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| 172 | sock = BIO_accept_ex(asock, NULL, 0);
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| 173 | } while (sock < 0 && BIO_sock_should_retry(ret));
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| 174 | if (sock < 0) {
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| 175 | ERR_print_errors(bio_err);
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| 176 | BIO_closesocket(asock);
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| 177 | break;
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| 178 | }
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| 179 | i = (*cb)(sock, type, context);
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| 180 | BIO_closesocket(sock);
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| 181 | } else {
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| 182 | i = (*cb)(asock, type, context);
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| 183 | }
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| 184 |
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| 185 | if (naccept != -1)
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| 186 | naccept--;
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| 187 | if (i < 0 || naccept == 0) {
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| 188 | BIO_closesocket(asock);
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| 189 | ret = i;
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| 190 | break;
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| 191 | }
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| 192 | }
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| 193 | end:
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| 194 | # ifdef AF_UNIX
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| 195 | if (family == AF_UNIX)
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| 196 | unlink(host);
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| 197 | # endif
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| 198 | return ret;
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| 199 | }
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| 200 |
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| 201 | #endif /* OPENSSL_NO_SOCK */
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