123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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* All rights reserved.
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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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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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// This file contains socket implementation that can be shared between
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// platforms as long as the correct headers are included.
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#define _GNU_SOURCE 1 // For asprintf
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#if !defined(_WIN32)
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#include <netinet/in.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#if !defined(_WIN32)
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#include <sys/un.h>
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#endif
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#include <unistd.h>
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#include <string>
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#include <cutils/sockets.h>
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#ifndef TEMP_FAILURE_RETRY // _WIN32 does not define
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#define TEMP_FAILURE_RETRY(exp) (exp)
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#endif
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int socket_get_local_port(cutils_socket_t sock) {
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sockaddr_storage addr;
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socklen_t addr_size = sizeof(addr);
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if (getsockname(sock, reinterpret_cast<sockaddr*>(&addr), &addr_size) == 0) {
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// sockaddr_in and sockaddr_in6 always overlap the port field.
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return ntohs(reinterpret_cast<sockaddr_in*>(&addr)->sin_port);
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}
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return -1;
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}
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int android_get_control_socket(const char* name) {
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char *key = NULL;
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if (asprintf(&key, ANDROID_SOCKET_ENV_PREFIX "%s", name) < 0) return -1;
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if (!key) return -1;
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char *cp = key;
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while (*cp) {
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if (!isalnum(*cp)) *cp = '_';
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++cp;
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}
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const char* val = getenv(key);
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free(key);
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if (!val) return -1;
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errno = 0;
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long fd = strtol(val, NULL, 10);
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if (errno) return -1;
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// validity checking
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if ((fd < 0) || (fd > INT_MAX)) return -1;
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#if defined(_SC_OPEN_MAX)
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if (fd >= sysconf(_SC_OPEN_MAX)) return -1;
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#elif defined(OPEN_MAX)
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if (fd >= OPEN_MAX) return -1;
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#elif defined(_POSIX_OPEN_MAX)
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if (fd >= _POSIX_OPEN_MAX) return -1;
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#endif
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#if defined(F_GETFD)
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if (TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD)) < 0) return -1;
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#elif defined(F_GETFL)
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if (TEMP_FAILURE_RETRY(fcntl(fd, F_GETFL)) < 0) return -1;
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#else
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struct stat s;
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if (TEMP_FAILURE_RETRY(fstat(fd, &s)) < 0) return -1;
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#endif
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#if !defined(_WIN32)
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struct sockaddr_un addr;
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socklen_t addrlen = sizeof(addr);
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int ret = TEMP_FAILURE_RETRY(getsockname(fd, (struct sockaddr *)&addr, &addrlen));
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if (ret < 0) return -1;
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char *path = NULL;
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if (asprintf(&path, ANDROID_SOCKET_DIR"/%s", name) < 0) return -1;
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if (!path) return -1;
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int cmp = strcmp(addr.sun_path, path);
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free(path);
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if (cmp != 0) return -1;
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#endif
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// It is what we think it is
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return static_cast<int>(fd);
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}
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