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Annotation of embedaddon/curl/lib/socketpair.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  *
        !            10:  * This software is licensed as described in the file COPYING, which
        !            11:  * you should have received as part of this distribution. The terms
        !            12:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            13:  *
        !            14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15:  * copies of the Software, and permit persons to whom the Software is
        !            16:  * furnished to do so, under the terms of the COPYING file.
        !            17:  *
        !            18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19:  * KIND, either express or implied.
        !            20:  *
        !            21:  ***************************************************************************/
        !            22: 
        !            23: #include "curl_setup.h"
        !            24: #include "socketpair.h"
        !            25: 
        !            26: #ifndef HAVE_SOCKETPAIR
        !            27: #ifdef WIN32
        !            28: /*
        !            29:  * This is a socketpair() implementation for Windows.
        !            30:  */
        !            31: #include <string.h>
        !            32: #include <winsock2.h>
        !            33: #include <ws2tcpip.h>
        !            34: #include <windows.h>
        !            35: #include <io.h>
        !            36: #else
        !            37: #ifdef HAVE_NETDB_H
        !            38: #include <netdb.h>
        !            39: #endif
        !            40: #ifdef HAVE_NETINET_IN_H
        !            41: #include <netinet/in.h> /* IPPROTO_TCP */
        !            42: #endif
        !            43: #ifdef HAVE_ARPA_INET_H
        !            44: #include <arpa/inet.h>
        !            45: #endif
        !            46: #ifndef INADDR_LOOPBACK
        !            47: #define INADDR_LOOPBACK 0x7f000001
        !            48: #endif /* !INADDR_LOOPBACK */
        !            49: #endif /* !WIN32 */
        !            50: 
        !            51: /* The last 3 #include files should be in this order */
        !            52: #include "curl_printf.h"
        !            53: #include "curl_memory.h"
        !            54: #include "memdebug.h"
        !            55: 
        !            56: int Curl_socketpair(int domain, int type, int protocol,
        !            57:                     curl_socket_t socks[2])
        !            58: {
        !            59:   union {
        !            60:     struct sockaddr_in inaddr;
        !            61:     struct sockaddr addr;
        !            62:   } a;
        !            63:   curl_socket_t listener;
        !            64:   curl_socklen_t addrlen = sizeof(a.inaddr);
        !            65:   int reuse = 1;
        !            66:   char data[2][12];
        !            67:   ssize_t dlen;
        !            68:   (void)domain;
        !            69:   (void)type;
        !            70:   (void)protocol;
        !            71: 
        !            72:   listener = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
        !            73:   if(listener == CURL_SOCKET_BAD)
        !            74:     return -1;
        !            75: 
        !            76:   memset(&a, 0, sizeof(a));
        !            77:   a.inaddr.sin_family = AF_INET;
        !            78:   a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        !            79:   a.inaddr.sin_port = 0;
        !            80: 
        !            81:   socks[0] = socks[1] = CURL_SOCKET_BAD;
        !            82: 
        !            83:   if(setsockopt(listener, SOL_SOCKET, SO_REUSEADDR,
        !            84:                 (char *)&reuse, (curl_socklen_t)sizeof(reuse)) == -1)
        !            85:     goto error;
        !            86:   if(bind(listener, &a.addr, sizeof(a.inaddr)) == -1)
        !            87:     goto error;
        !            88:   if(getsockname(listener, &a.addr, &addrlen) == -1)
        !            89:     goto error;
        !            90:   if(listen(listener, 1) == -1)
        !            91:     goto error;
        !            92:   socks[0] = socket(AF_INET, SOCK_STREAM, 0);
        !            93:   if(socks[0] == CURL_SOCKET_BAD)
        !            94:     goto error;
        !            95:   if(connect(socks[0], &a.addr, sizeof(a.inaddr)) == -1)
        !            96:     goto error;
        !            97:   socks[1] = accept(listener, NULL, NULL);
        !            98:   if(socks[1] == CURL_SOCKET_BAD)
        !            99:     goto error;
        !           100: 
        !           101:   /* verify that nothing else connected */
        !           102:   msnprintf(data[0], sizeof(data[0]), "%p", socks);
        !           103:   dlen = strlen(data[0]);
        !           104:   if(swrite(socks[0], data[0], dlen) != dlen)
        !           105:     goto error;
        !           106:   if(sread(socks[1], data[1], sizeof(data[1])) != dlen)
        !           107:     goto error;
        !           108:   if(memcmp(data[0], data[1], dlen))
        !           109:     goto error;
        !           110: 
        !           111:   sclose(listener);
        !           112:   return 0;
        !           113: 
        !           114:   error:
        !           115:   sclose(listener);
        !           116:   sclose(socks[0]);
        !           117:   sclose(socks[1]);
        !           118:   return -1;
        !           119: }
        !           120: 
        !           121: #endif /* ! HAVE_SOCKETPAIR */