apps/s_socket.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /* socket-related functions used by s_client and s_server */
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <errno.h>
  15 #include <signal.h>
  16 #include <openssl/opensslconf.h>
  17
  18 /*
  19  * With IPv6, it looks like Digital has mixed up the proper order of
  20  * recursive header file inclusion, resulting in the compiler complaining
  21  * that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which is
  22  * needed to have fileno() declared correctly...  So let's define u_int
  23  */
  24 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
  25 # define __U_INT
  26 typedef unsigned int u_int;
  27 #endif
  28
  29 #ifndef OPENSSL_NO_SOCK
  30
  31 # define USE_SOCKETS
  32 # include "apps.h"
  33 # undef USE_SOCKETS
  34 # include "s_apps.h"
  35
  36 # include <openssl/bio.h>
  37 # include <openssl/err.h>
  38
  39 /*
  40  * init_client - helper routine to set up socket communication
  41  * @sock: pointer to storage of resulting socket.
  42  * @host: the host name or path (for AF_UNIX) to connect to.
  43  * @port: the port to connect to (ignored for AF_UNIX).
  44  * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
  45  *  AF_UNSPEC
  46  * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
  47  * @protocol: socket protocol, e.g. IPPROTO_TCP or IPPROTO_UDP (or 0 for any)
  48  *
  49  * This will create a socket and use it to connect to a host:port, or if
  50  * family == AF_UNIX, to the path found in host.
  51  *
  52  * If the host has more than one address, it will try them one by one until
  53  * a successful connection is established.  The resulting socket will be
  54  * found in *sock on success, it will be given INVALID_SOCKET otherwise.
  55  *
  56  * Returns 1 on success, 0 on failure.
  57  */
  58 int init_client(int *sock, const char *host, const char *port,
  59                 int family, int type, int protocol)
  60 {
  61     BIO_ADDRINFO *res = NULL;
  62     const BIO_ADDRINFO *ai = NULL;
  63     int ret;
  64
  65     if (!BIO_sock_init())
  66         return 0;
  67
  68     ret = BIO_lookup_ex(host, port, BIO_LOOKUP_CLIENT, family, type, protocol,
  69                         &res);
  70     if (ret == 0) {
  71         ERR_print_errors(bio_err);
  72         return 0;
  73     }
  74
  75     ret = 0;
  76     for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) {
  77         /* Admittedly, these checks are quite paranoid, we should not get
  78          * anything in the BIO_ADDRINFO chain that we haven't
  79          * asked for. */
  80         OPENSSL_assert((family == AF_UNSPEC
  81                         || family == BIO_ADDRINFO_family(ai))
  82                        && (type == 0 || type == BIO_ADDRINFO_socktype(ai))
  83                        && (protocol == 0
  84                            || protocol == BIO_ADDRINFO_protocol(ai)));
  85
  86         *sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai),
  87                            BIO_ADDRINFO_protocol(ai), 0);
  88         if (*sock == INVALID_SOCKET) {
  89             /* Maybe the kernel doesn't support the socket family, even if
  90              * BIO_lookup() added it in the returned result...
  91              */
  92             continue;
  93         }
  94
  95 #ifndef OPENSSL_NO_SCTP
  96         if (protocol == IPPROTO_SCTP) {
  97             /*
  98              * For SCTP we have to set various options on the socket prior to
  99              * connecting. This is done automatically by BIO_new_dgram_sctp().
 100              * We don't actually need the created BIO though so we free it again
 101              * immediately.
 102              */
 103             BIO *tmpbio = BIO_new_dgram_sctp(*sock, BIO_NOCLOSE);
 104
 105             if (tmpbio == NULL) {
 106                 ERR_print_errors(bio_err);
 107                 return 0;
 108             }
 109             BIO_free(tmpbio);
 110         }
 111 #endif
 112
 113         if (!BIO_connect(*sock, BIO_ADDRINFO_address(ai), 0)) {
 114             BIO_closesocket(*sock);
 115             *sock = INVALID_SOCKET;
 116             continue;
 117         }
 118
 119         /* Success, don't try any more addresses */
 120         break;
 121     }
 122
 123     if (*sock == INVALID_SOCKET) {
 124         ERR_print_errors(bio_err);
 125     } else {
 126         /* Remove any stale errors from previous connection attempts */
 127         ERR_clear_error();
 128         ret = 1;
 129     }
 130     BIO_ADDRINFO_free(res);
 131     return ret;
 132 }
 133
 134 /*
 135  * do_server - helper routine to perform a server operation
 136  * @accept_sock: pointer to storage of resulting socket.
 137  * @host: the host name or path (for AF_UNIX) to connect to.
 138  * @port: the port to connect to (ignored for AF_UNIX).
 139  * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
 140  *  AF_UNSPEC
 141  * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
 142  * @cb: pointer to a function that receives the accepted socket and
 143  *  should perform the communication with the connecting client.
 144  * @context: pointer to memory that's passed verbatim to the cb function.
 145  * @naccept: number of times an incoming connect should be accepted.  If -1,
 146  *  unlimited number.
 147  *
 148  * This will create a socket and use it to listen to a host:port, or if
 149  * family == AF_UNIX, to the path found in host, then start accepting
 150  * incoming connections and run cb on the resulting socket.
 151  *
 152  * 0 on failure, something other on success.
 153  */
 154 int do_server(int *accept_sock, const char *host, const char *port,
 155               int family, int type, int protocol, do_server_cb cb,
 156               unsigned char *context, int naccept)
 157 {
 158     int asock = 0;
 159     int sock;
 160     int i;
 161     BIO_ADDRINFO *res = NULL;
 162     int ret = 0;
 163
 164     if (!BIO_sock_init())
 165         return 0;
 166
 167     if (!BIO_lookup_ex(host, port, BIO_LOOKUP_SERVER, family, type, protocol,
 168                        &res)) {
 169         ERR_print_errors(bio_err);
 170         return 0;
 171     }
 172
 173     /* Admittedly, these checks are quite paranoid, we should not get
 174      * anything in the BIO_ADDRINFO chain that we haven't asked for */
 175     OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
 176                    && (type == 0 || type == BIO_ADDRINFO_socktype(res))
 177                    && (protocol == 0 || protocol == BIO_ADDRINFO_protocol(res)));
 178
 179     asock = BIO_socket(BIO_ADDRINFO_family(res), BIO_ADDRINFO_socktype(res),
 180                        BIO_ADDRINFO_protocol(res), 0);
 181     if (asock == INVALID_SOCKET
 182         || !BIO_listen(asock, BIO_ADDRINFO_address(res), BIO_SOCK_REUSEADDR)) {
 183         BIO_ADDRINFO_free(res);
 184         ERR_print_errors(bio_err);
 185         if (asock != INVALID_SOCKET)
 186             BIO_closesocket(asock);
 187         goto end;
 188     }
 189
 190 #ifndef OPENSSL_NO_SCTP
 191     if (protocol == IPPROTO_SCTP) {
 192         /*
 193          * For SCTP we have to set various options on the socket prior to
 194          * accepting. This is done automatically by BIO_new_dgram_sctp().
 195          * We don't actually need the created BIO though so we free it again
 196          * immediately.
 197          */
 198         BIO *tmpbio = BIO_new_dgram_sctp(asock, BIO_NOCLOSE);
 199
 200         if (tmpbio == NULL) {
 201             BIO_closesocket(asock);
 202             ERR_print_errors(bio_err);
 203             goto end;
 204         }
 205         BIO_free(tmpbio);
 206     }
 207 #endif
 208
 209     BIO_ADDRINFO_free(res);
 210     res = NULL;
 211
 212     if (accept_sock != NULL)
 213         *accept_sock = asock;
 214     for (;;) {
 215         if (type == SOCK_STREAM) {
 216             do {
 217                 sock = BIO_accept_ex(asock, NULL, 0);
 218             } while (sock < 0 && BIO_sock_should_retry(ret));
 219             if (sock < 0) {
 220                 ERR_print_errors(bio_err);
 221                 BIO_closesocket(asock);
 222                 break;
 223             }
 224             i = (*cb)(sock, type, protocol, context);
 225             BIO_closesocket(sock);
 226         } else {
 227             i = (*cb)(asock, type, protocol, context);
 228         }
 229
 230         if (naccept != -1)
 231             naccept--;
 232         if (i < 0 || naccept == 0) {
 233             BIO_closesocket(asock);
 234             ret = i;
 235             break;
 236         }
 237     }
 238  end:
 239 # ifdef AF_UNIX
 240     if (family == AF_UNIX)
 241         unlink(host);
 242 # endif
 243     return ret;
 244 }
 245
 246 #endif  /* OPENSSL_NO_SOCK */