1/*
2 * Copyright (C) 2015 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
17#define TRACE_TAG TRACE_RWX
18
19#include "adb_io.h"
20
21#include <unistd.h>
22
23#include <base/stringprintf.h>
24
25#include "adb_trace.h"
26#include "adb_utils.h"
27#include "sysdeps.h"
28
29bool SendProtocolString(int fd, const std::string& s) {
30    int length = s.size();
31    if (length > 0xffff) {
32        length = 0xffff;
33    }
34
35    return WriteFdFmt(fd, "%04x", length) && WriteFdExactly(fd, s);
36}
37
38bool SendOkay(int fd) {
39    return WriteFdExactly(fd, "OKAY", 4);
40}
41
42bool SendFail(int fd, const std::string& reason) {
43    return WriteFdExactly(fd, "FAIL", 4) && SendProtocolString(fd, reason);
44}
45
46bool ReadFdExactly(int fd, void* buf, size_t len) {
47    char* p = reinterpret_cast<char*>(buf);
48
49    size_t len0 = len;
50
51    D("readx: fd=%d wanted=%zu\n", fd, len);
52    while (len > 0) {
53        int r = adb_read(fd, p, len);
54        if (r > 0) {
55            len -= r;
56            p += r;
57        } else if (r == -1) {
58            D("readx: fd=%d error %d: %s\n", fd, errno, strerror(errno));
59            return false;
60        } else {
61            D("readx: fd=%d disconnected\n", fd);
62            errno = 0;
63            return false;
64        }
65    }
66
67    D("readx: fd=%d wanted=%zu got=%zu\n", fd, len0, len0 - len);
68    if (ADB_TRACING) {
69        dump_hex(reinterpret_cast<const unsigned char*>(buf), len0);
70    }
71
72    return true;
73}
74
75bool WriteFdExactly(int fd, const void* buf, size_t len) {
76    const char* p = reinterpret_cast<const char*>(buf);
77    int r;
78
79    D("writex: fd=%d len=%d: ", fd, (int)len);
80    if (ADB_TRACING) {
81        dump_hex(reinterpret_cast<const unsigned char*>(buf), len);
82    }
83
84    while (len > 0) {
85        r = adb_write(fd, p, len);
86        if (r == -1) {
87            D("writex: fd=%d error %d: %s\n", fd, errno, strerror(errno));
88            if (errno == EAGAIN) {
89                adb_sleep_ms(1); // just yield some cpu time
90                continue;
91            } else if (errno == EPIPE) {
92                D("writex: fd=%d disconnected\n", fd);
93                errno = 0;
94                return false;
95            } else {
96                return false;
97            }
98        } else {
99            len -= r;
100            p += r;
101        }
102    }
103    return true;
104}
105
106bool WriteFdExactly(int fd, const char* str) {
107    return WriteFdExactly(fd, str, strlen(str));
108}
109
110bool WriteFdExactly(int fd, const std::string& str) {
111    return WriteFdExactly(fd, str.c_str(), str.size());
112}
113
114bool WriteFdFmt(int fd, const char* fmt, ...) {
115    std::string str;
116
117    va_list ap;
118    va_start(ap, fmt);
119    android::base::StringAppendV(&str, fmt, ap);
120    va_end(ap);
121
122    return WriteFdExactly(fd, str);
123}
124