mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 14:52:24 +00:00
312 lines
8.9 KiB
C++
312 lines
8.9 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 ZeroTier Networks LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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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 <vector>
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#include <utility>
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#include <algorithm>
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#include "Constants.hpp"
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#include "HttpClient.hpp"
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#include "Thread.hpp"
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#include "Utils.hpp"
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#include "NonCopyable.hpp"
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#include "Defaults.hpp"
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#ifdef __UNIX_LIKE__
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/select.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#endif
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namespace ZeroTier {
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const std::map<std::string,std::string> HttpClient::NO_HEADERS;
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#ifdef __UNIX_LIKE__
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// The *nix implementation calls 'curl' externally rather than linking to it.
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// This makes it an optional dependency that can be avoided in tiny systems
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// provided you don't want to have automatic software updates... or want to
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// do them via another method.
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#ifdef __APPLE__
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// TODO: get proxy configuration
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#endif
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// Paths where "curl" may be found on the system
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#define NUM_CURL_PATHS 5
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static const char *CURL_PATHS[NUM_CURL_PATHS] = { "/usr/bin/curl","/bin/curl","/usr/local/bin/curl","/usr/sbin/curl","/sbin/curl" };
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// Maximum message length
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#define CURL_MAX_MESSAGE_LENGTH (1024 * 1024 * 64)
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// Internal private thread class that performs request, notifies handler,
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// and then commits suicide by deleting itself.
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class P_Req : NonCopyable
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{
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public:
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P_Req(const char *method,const std::string &url,const std::map<std::string,std::string> &headers,unsigned int timeout,void (*handler)(void *,int,const std::string &,bool,const std::string &),void *arg) :
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_url(url),
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_headers(headers),
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_timeout(timeout),
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_handler(handler),
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_arg(arg)
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{
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_myThread = Thread::start(this);
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}
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void threadMain()
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{
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char *curlArgs[1024];
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char buf[16384];
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fd_set readfds,writefds,errfds;
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struct timeval tv;
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std::string curlPath;
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for(int i=0;i<NUM_CURL_PATHS;++i) {
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if (Utils::fileExists(CURL_PATHS[i])) {
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curlPath = CURL_PATHS[i];
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break;
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}
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}
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if (!curlPath.length()) {
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_handler(_arg,-1,_url,false,"unable to locate 'curl' binary in /usr/bin, /bin, /usr/local/bin, /usr/sbin, or /sbin");
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delete this;
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return;
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}
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if (!_url.length()) {
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_handler(_arg,-1,_url,false,"cannot fetch empty URL");
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delete this;
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return;
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}
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curlArgs[0] = const_cast <char *>(curlPath.c_str());
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curlArgs[1] = const_cast <char *>("-D");
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curlArgs[2] = const_cast <char *>("-"); // append headers before output
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int argPtr = 3;
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std::vector<std::string> headerArgs;
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for(std::map<std::string,std::string>::const_iterator h(_headers.begin());h!=_headers.end();++h) {
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headerArgs.push_back(h->first);
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headerArgs.back().append(": ");
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headerArgs.back().append(h->second);
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}
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for(std::vector<std::string>::iterator h(headerArgs.begin());h!=headerArgs.end();++h) {
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if (argPtr >= (1024 - 4)) // leave room for terminating NULL and URL
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break;
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curlArgs[argPtr++] = const_cast <char *>("-H");
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curlArgs[argPtr++] = const_cast <char *>(h->c_str());
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}
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curlArgs[argPtr++] = const_cast <char *>(_url.c_str());
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curlArgs[argPtr] = (char *)0;
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int curlStdout[2];
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int curlStderr[2];
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::pipe(curlStdout);
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::pipe(curlStderr);
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long pid = (long)vfork();
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if (pid < 0) {
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// fork() failed
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::close(curlStdout[0]);
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::close(curlStdout[1]);
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::close(curlStderr[0]);
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::close(curlStderr[1]);
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_handler(_arg,-1,_url,false,"unable to fork()");
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delete this;
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return;
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} else if (pid > 0) {
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// fork() succeeded, in parent process
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::close(curlStdout[1]);
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::close(curlStderr[1]);
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fcntl(curlStdout[0],F_SETFL,O_NONBLOCK);
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fcntl(curlStderr[0],F_SETFL,O_NONBLOCK);
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int exitCode = -1;
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unsigned long long timesOutAt = Utils::now() + ((unsigned long long)_timeout * 1000ULL);
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bool timedOut = false;
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bool tooLong = false;
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for(;;) {
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FD_ZERO(&readfds);
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FD_ZERO(&writefds);
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FD_ZERO(&errfds);
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FD_SET(curlStdout[0],&readfds);
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FD_SET(curlStderr[0],&readfds);
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FD_SET(curlStdout[0],&errfds);
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FD_SET(curlStderr[0],&errfds);
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tv.tv_sec = 1;
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tv.tv_usec = 0;
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select(std::max(curlStdout[0],curlStderr[0])+1,&readfds,&writefds,&errfds,&tv);
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if (FD_ISSET(curlStdout[0],&readfds)) {
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int n = (int)::read(curlStdout[0],buf,sizeof(buf));
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if (n > 0) {
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_body.append(buf,n);
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// Reset timeout when data is read...
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timesOutAt = Utils::now() + ((unsigned long long)_timeout * 1000ULL);
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} else if (n < 0)
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break;
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if (_body.length() > CURL_MAX_MESSAGE_LENGTH) {
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::kill(pid,SIGKILL);
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tooLong = true;
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break;
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}
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}
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if (FD_ISSET(curlStderr[0],&readfds))
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::read(curlStderr[0],buf,sizeof(buf));
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if (FD_ISSET(curlStdout[0],&errfds)||FD_ISSET(curlStderr[0],&errfds))
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break;
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if (Utils::now() >= timesOutAt) {
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::kill(pid,SIGKILL);
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timedOut = true;
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break;
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}
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if (waitpid(pid,&exitCode,WNOHANG) > 0) {
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for(;;) {
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// Drain output...
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int n = (int)::read(curlStdout[0],buf,sizeof(buf));
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if (n <= 0)
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break;
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else {
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_body.append(buf,n);
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if (_body.length() > CURL_MAX_MESSAGE_LENGTH) {
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tooLong = true;
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break;
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}
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}
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}
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pid = 0;
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break;
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}
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}
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if (pid > 0)
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waitpid(pid,&exitCode,0);
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::close(curlStdout[0]);
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::close(curlStderr[0]);
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if (timedOut)
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_handler(_arg,-1,_url,false,"connection timed out");
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else if (tooLong)
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_handler(_arg,-1,_url,false,"response too long");
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else if (exitCode)
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_handler(_arg,-1,_url,false,"connection failed (curl returned non-zero exit code)");
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else {
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unsigned long idx = 0;
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// Grab status line and headers, which will prefix output on
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// success and will end with an empty line.
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std::vector<std::string> headers;
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headers.push_back(std::string());
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while (idx < _body.length()) {
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char c = _body[idx++];
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if (c == '\n') {
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if (!headers.back().length()) {
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headers.pop_back();
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break;
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} else headers.push_back(std::string());
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} else if (c != '\r')
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headers.back().push_back(c);
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}
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if (headers.empty()||(!headers.front().length())) {
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_handler(_arg,-1,_url,false,"HTTP response empty");
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delete this;
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return;
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}
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// Parse first line -- HTTP status code and response
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size_t scPos = headers.front().find(' ');
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if (scPos == std::string::npos) {
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_handler(_arg,-1,_url,false,"invalid HTTP response (no status line)");
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delete this;
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return;
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}
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++scPos;
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unsigned int rcode = Utils::strToUInt(headers.front().substr(scPos,3).c_str());
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if ((!rcode)||(rcode > 999)) {
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_handler(_arg,-1,_url,false,"invalid HTTP response (invalid response code)");
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delete this;
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return;
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}
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// Serve up the resulting data to the handler
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if (rcode == 200)
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_handler(_arg,rcode,_url,false,_body.substr(idx));
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else if ((scPos + 4) < headers.front().length())
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_handler(_arg,rcode,_url,false,headers.front().substr(scPos+4));
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else _handler(_arg,rcode,_url,false,"(no status message from server)");
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}
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delete this;
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return;
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} else {
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// fork() succeeded, in child process
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::dup2(curlStdout[1],STDOUT_FILENO);
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::close(curlStdout[1]);
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::dup2(curlStderr[1],STDERR_FILENO);
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::close(curlStderr[1]);
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::execv(curlPath.c_str(),curlArgs);
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::exit(-1); // only reached if execv() fails
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}
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}
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const std::string _url;
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std::string _body;
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std::map<std::string,std::string> _headers;
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unsigned int _timeout;
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void (*_handler)(void *,int,const std::string &,bool,const std::string &);
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void *_arg;
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Thread _myThread;
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};
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HttpClient::Request HttpClient::_do(
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const char *method,
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const std::string &url,
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const std::map<std::string,std::string> &headers,
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unsigned int timeout,
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void (*handler)(void *,int,const std::string &,bool,const std::string &),
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void *arg)
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{
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return (HttpClient::Request)(new P_Req(method,url,headers,timeout,handler,arg));
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}
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#endif
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} // namespace ZeroTier
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