1 /*
2 * Copyright (C) 2016 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
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <netdb.h>
21 #include <netinet/in.h>
22 #include <sys/socket.h>
23 #include <sys/types.h>
24 #include <sys/uio.h>
25 #include <iostream>
26 #include <string>
27
28 #include <android/multinetwork.h>
29 #include <android-base/stringprintf.h>
30 #include "common.h"
31
32
33
34 struct Parameters {
ParametersParameters35 Parameters() : ss({}), port("80"), path("/") {}
36
37 struct sockaddr_storage ss;
38 std::string host;
39 std::string hostname;
40 std::string port;
41 std::string path;
42 };
43
44
parseUrl(const struct Arguments & args,struct Parameters * parameters)45 bool parseUrl(const struct Arguments& args, struct Parameters* parameters) {
46 if (parameters == nullptr) { return false; }
47
48 static const char HTTP_PREFIX[] = "http://";
49 if (strncmp(args.arg1, HTTP_PREFIX, strlen(HTTP_PREFIX)) != 0) {
50 std::cerr << "Only " << HTTP_PREFIX << " URLs supported." << std::endl;
51 return false;
52 }
53
54 parameters->host = std::string(args.arg1).substr(strlen(HTTP_PREFIX));
55 const auto first_slash = parameters->host.find_first_of('/');
56 if (first_slash != std::string::npos) {
57 parameters->path = parameters->host.substr(first_slash);
58 parameters->host.erase(first_slash);
59 }
60
61 if (parameters->host.size() == 0) {
62 std::cerr << "Host portion cannot be empty." << std::endl;
63 return false;
64 }
65
66 if (parameters->host[0] == '[') {
67 const auto closing_bracket = parameters->host.find_first_of(']');
68 if (closing_bracket == std::string::npos) {
69 std::cerr << "Missing closing bracket." << std::endl;
70 return false;
71 }
72 parameters->hostname = parameters->host.substr(1, closing_bracket - 1);
73
74 const auto colon_port = closing_bracket + 1;
75 if (colon_port < parameters->host.size()) {
76 if (parameters->host[colon_port] != ':') {
77 std::cerr << "Malformed port portion." << std::endl;
78 return false;
79 }
80 parameters->port = parameters->host.substr(closing_bracket + 2);
81 }
82 } else {
83 const auto first_colon = parameters->host.find_first_of(':');
84 if (first_colon != std::string::npos) {
85 parameters->port = parameters->host.substr(first_colon + 1);
86 parameters->hostname = parameters->host.substr(0, first_colon);
87 } else {
88 parameters->hostname = parameters->host;
89 }
90 }
91
92 // TODO: find the request portion to send (before '#...').
93
94 std::cerr << "Resolving hostname=" << parameters->hostname
95 << ", port=" << parameters->port
96 << std::endl;
97
98 struct addrinfo hints = {
99 .ai_family = args.family,
100 .ai_socktype = SOCK_STREAM,
101 };
102 struct addrinfo *result = nullptr;
103
104 int rval = -1;
105 switch (args.api_mode) {
106 case ApiMode::EXPLICIT:
107 rval = android_getaddrinfofornetwork(args.nethandle,
108 parameters->hostname.c_str(),
109 parameters->port.c_str(),
110 &hints, &result);
111 break;
112 case ApiMode::PROCESS:
113 rval = getaddrinfo(parameters->hostname.c_str(),
114 parameters->port.c_str(),
115 &hints, &result);
116 break;
117 default:
118 // Unreachable.
119 std::cerr << "Unknown api mode." << std::endl;
120 return false;
121 }
122
123 if (rval != 0) {
124 std::cerr << "DNS resolution failure; gaierror=" << rval
125 << " [" << gai_strerror(rval) << "]"
126 << std::endl;
127 return rval;
128 }
129
130 memcpy(&(parameters->ss), result[0].ai_addr, result[0].ai_addrlen);
131 std::cerr << "Connecting to: "
132 << inetSockaddrToString(result[0].ai_addr)
133 << std::endl;
134
135 freeaddrinfo(result);
136 return true;
137 }
138
139
makeTcpSocket(sa_family_t address_family,net_handle_t nethandle)140 int makeTcpSocket(sa_family_t address_family, net_handle_t nethandle) {
141 int fd = socket(address_family, SOCK_STREAM, IPPROTO_TCP);
142 if (fd < 0) {
143 std::cerr << "failed to create TCP socket" << std::endl;
144 return -1;
145 }
146
147 // Don't let reads or writes block indefinitely. We cannot control
148 // connect() timeouts without nonblocking sockets and select/poll/epoll.
149 const struct timeval timeo = { 5, 0 }; // 5 seconds
150 setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(timeo));
151 setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo));
152
153 if (nethandle != NETWORK_UNSPECIFIED) {
154 if (android_setsocknetwork(nethandle, fd) != 0) {
155 int errnum = errno;
156 std::cerr << "android_setsocknetwork() failed;"
157 << " errno: " << errnum << " [" << strerror(errnum) << "]"
158 << std::endl;
159 close(fd);
160 return -1;
161 }
162 }
163 return fd;
164 }
165
166
doHttpQuery(int fd,const struct Parameters & parameters)167 int doHttpQuery(int fd, const struct Parameters& parameters) {
168 int rval = -1;
169 if (connect(fd,
170 reinterpret_cast<const struct sockaddr *>(&(parameters.ss)),
171 (parameters.ss.ss_family == AF_INET6)
172 ? sizeof(struct sockaddr_in6)
173 : sizeof(struct sockaddr_in)) != 0) {
174 int errnum = errno;
175 std::cerr << "Failed to connect; errno=" << errnum
176 << " [" << strerror(errnum) << "]"
177 << std::endl;
178 return -1;
179 }
180
181 const std::string request(android::base::StringPrintf(
182 "GET %s HTTP/1.1\r\n"
183 "Host: %s\r\n"
184 "Accept: */*\r\n"
185 "Connection: close\r\n"
186 "User-Agent: httpurl/0.0\r\n"
187 "\r\n",
188 parameters.path.c_str(), parameters.host.c_str()));
189 const ssize_t sent = write(fd, request.c_str(), request.size());
190 if (sent != static_cast<ssize_t>(request.size())) {
191 std::cerr << "Sent only " << sent << "/" << request.size() << " bytes"
192 << std::endl;
193 return -1;
194 }
195
196 char buf[4*1024];
197 do {
198 rval = recv(fd, buf, sizeof(buf), 0);
199
200 if (rval < 0) {
201 const int saved_errno = errno;
202 std::cerr << "Failed to recv; errno=" << saved_errno
203 << " [" << strerror(saved_errno) << "]"
204 << std::endl;
205 } else if (rval > 0) {
206 std::cout.write(buf, rval);
207 std::cout.flush();
208 }
209 } while (rval > 0);
210 std::cout << std::endl;
211
212 return 0;
213 }
214
215
main(int argc,const char * argv[])216 int main(int argc, const char* argv[]) {
217 int rval = -1;
218
219 struct Arguments args;
220 if (!args.parseArguments(argc, argv)) { return rval; }
221
222 if (args.api_mode == ApiMode::PROCESS) {
223 rval = android_setprocnetwork(args.nethandle);
224 if (rval != 0) {
225 int errnum = errno;
226 std::cerr << "android_setprocnetwork(" << args.nethandle << ") failed;"
227 << " errno: " << errnum << " [" << strerror(errnum) << "]"
228 << std::endl;
229 return rval;
230 }
231 }
232
233 struct Parameters parameters;
234 if (!parseUrl(args, ¶meters)) { return -1; }
235
236 // TODO: Fall back from IPv6 to IPv4 if ss.ss_family is AF_UNSPEC.
237 // This will involve changes to parseUrl() as well.
238 struct FdAutoCloser closer = makeTcpSocket(
239 parameters.ss.ss_family,
240 (args.api_mode == ApiMode::EXPLICIT) ? args.nethandle
241 : NETWORK_UNSPECIFIED);
242 if (closer.fd < 0) { return closer.fd; }
243
244 return doHttpQuery(closer.fd, parameters);
245 }
246