1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #include "SocketStream.h"
17 #include <cutils/sockets.h>
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <unistd.h>
22 #include <string.h>
23
24 #ifndef _WIN32
25 #include <netinet/in.h>
26 #include <netinet/tcp.h>
27 #include <sys/un.h>
28 #else
29 #include <ws2tcpip.h>
30 #endif
31
SocketStream(size_t bufSize)32 SocketStream::SocketStream(size_t bufSize) :
33 IOStream(bufSize),
34 m_sock(-1),
35 m_bufsize(bufSize),
36 m_buf(NULL)
37 {
38 }
39
SocketStream(int sock,size_t bufSize)40 SocketStream::SocketStream(int sock, size_t bufSize) :
41 IOStream(bufSize),
42 m_sock(sock),
43 m_bufsize(bufSize),
44 m_buf(NULL)
45 {
46 }
47
~SocketStream()48 SocketStream::~SocketStream()
49 {
50 if (m_sock >= 0) {
51 #ifdef _WIN32
52 closesocket(m_sock);
53 #else
54 ::close(m_sock);
55 #endif
56 }
57 if (m_buf != NULL) {
58 free(m_buf);
59 m_buf = NULL;
60 }
61 }
62
63
allocBuffer(size_t minSize)64 void *SocketStream::allocBuffer(size_t minSize)
65 {
66 size_t allocSize = (m_bufsize < minSize ? minSize : m_bufsize);
67 if (!m_buf) {
68 m_buf = (unsigned char *)malloc(allocSize);
69 }
70 else if (m_bufsize < allocSize) {
71 unsigned char *p = (unsigned char *)realloc(m_buf, allocSize);
72 if (p != NULL) {
73 m_buf = p;
74 m_bufsize = allocSize;
75 } else {
76 ERR("%s: realloc (%zu) failed\n", __FUNCTION__, allocSize);
77 free(m_buf);
78 m_buf = NULL;
79 m_bufsize = 0;
80 }
81 }
82
83 return m_buf;
84 };
85
commitBuffer(size_t size)86 int SocketStream::commitBuffer(size_t size)
87 {
88 return writeFully(m_buf, size);
89 }
90
writeFully(const void * buffer,size_t size)91 int SocketStream::writeFully(const void* buffer, size_t size)
92 {
93 if (!valid()) return -1;
94
95 size_t res = size;
96 int retval = 0;
97
98 while (res > 0) {
99 ssize_t stat = ::send(m_sock, (const char *)buffer + (size - res), res, 0);
100 if (stat < 0) {
101 if (errno != EINTR) {
102 retval = stat;
103 ERR("%s: failed: %s\n", __FUNCTION__, strerror(errno));
104 break;
105 }
106 } else {
107 res -= stat;
108 }
109 }
110 return retval;
111 }
112
readFully(void * buf,size_t len)113 const unsigned char *SocketStream::readFully(void *buf, size_t len)
114 {
115 if (!valid()) return NULL;
116 if (!buf) {
117 return NULL; // do not allow NULL buf in that implementation
118 }
119 size_t res = len;
120 while (res > 0) {
121 ssize_t stat = ::recv(m_sock, (char *)(buf) + len - res, res, 0);
122 if (stat > 0) {
123 res -= stat;
124 continue;
125 }
126 if (stat == 0 || errno != EINTR) { // client shutdown or error
127 return NULL;
128 }
129 }
130 return (const unsigned char *)buf;
131 }
132
commitBufferAndReadFully(size_t size,void * buf,size_t len)133 const unsigned char *SocketStream::commitBufferAndReadFully(size_t size, void *buf, size_t len)
134 {
135 return commitBuffer(size) ? NULL : readFully(buf, len);
136 }
137
read(void * buf,size_t * inout_len)138 const unsigned char *SocketStream::read( void *buf, size_t *inout_len)
139 {
140 if (!valid()) return NULL;
141 if (!buf) {
142 return NULL; // do not allow NULL buf in that implementation
143 }
144
145 int n;
146 do {
147 n = recv(buf, *inout_len);
148 } while( n < 0 && errno == EINTR );
149
150 if (n > 0) {
151 *inout_len = n;
152 return (const unsigned char *)buf;
153 }
154
155 return NULL;
156 }
157
recv(void * buf,size_t len)158 int SocketStream::recv(void *buf, size_t len)
159 {
160 if (!valid()) return int(ERR_INVALID_SOCKET);
161 int res = 0;
162 while(true) {
163 res = ::recv(m_sock, (char *)buf, len, 0);
164 if (res < 0) {
165 if (errno == EINTR) {
166 continue;
167 }
168 }
169 break;
170 }
171 return res;
172 }
173