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Mini Shell
Mini Shell
/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2010-2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <oxt/system_calls.hpp>
#include <boost/thread.hpp>
#include <boost/shared_array.hpp>
#include <algorithm>
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cerrno>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/uio.h>
#include <libgen.h>
#include <fcntl.h>
#include <poll.h>
#include <dirent.h>
#include <limits.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#ifdef __linux__
#include <sys/syscall.h>
#include <features.h>
#endif
#include <vector>
#include <FileDescriptor.h>
#include <ResourceLocator.h>
#include <Exceptions.h>
#include <ProcessManagement/Spawn.h>
#include <ProcessManagement/Utils.h>
#include <Utils.h>
#include <StrIntTools/StrIntUtils.h>
#include <IOTools/IOUtils.h>
#ifndef HOST_NAME_MAX
#if defined(_POSIX_HOST_NAME_MAX)
#define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
#elif defined(_SC_HOST_NAME_MAX)
#define HOST_NAME_MAX sysconf(_SC_HOST_NAME_MAX)
#else
#define HOST_NAME_MAX 255
#endif
#endif
namespace Passenger {
string
escapeForXml(const StaticString &input) {
string result(input.data(), input.size());
string::size_type input_pos = 0;
string::size_type input_end_pos = input.size();
string::size_type result_pos = 0;
while (input_pos < input_end_pos) {
const unsigned char ch = input[input_pos];
if ((ch >= 'A' && ch <= 'z')
|| (ch >= '0' && ch <= '9')
|| ch == '/' || ch == ' ' || ch == '_' || ch == '.'
|| ch == ':' || ch == '+' || ch == '-') {
// This is an ASCII character. Ignore it and
// go to next character.
result_pos++;
} else {
// Not an ASCII character; escape it.
char escapedCharacter[sizeof("ÿ") + 1];
int size;
size = snprintf(escapedCharacter,
sizeof(escapedCharacter) - 1,
"&#%d;",
(int) ch);
if (size < 0) {
throw std::bad_alloc();
}
escapedCharacter[sizeof(escapedCharacter) - 1] = '\0';
result.replace(result_pos, 1, escapedCharacter, size);
result_pos += size;
}
input_pos++;
}
return result;
}
string
escapeShell(const StaticString &value) {
if (value.empty()) {
return "''";
}
const char *pos = value.data();
const char *end = value.data() + value.size();
string result;
result.reserve((value.size() * 3) / 2);
while (pos < end) {
char ch = *pos;
if (ch == '\n') {
// It is not possible to escape a newline with a backslash.
// This is because a backslash + newline combination
// is treated to mean a line continuation
result.append("'\n'", 3);
} else {
bool allowed =
(ch >= 'A' && ch <= 'Z')
|| (ch >= 'a' && ch <= 'z')
|| (ch >= '0' && ch <= '9')
|| ch == '_'
|| ch == '-'
|| ch == '.'
|| ch == ','
|| ch == ':'
|| ch == '/'
|| ch == '@';
if (!allowed) {
result.append(1, '\\');
}
result.append(1, ch);
}
pos++;
}
return result;
}
mode_t
parseModeString(const StaticString &mode) {
mode_t modeBits = 0;
vector<string> clauses;
vector<string>::iterator it;
split(mode, ',', clauses);
for (it = clauses.begin(); it != clauses.end(); it++) {
const string &clause = *it;
if (clause.empty()) {
continue;
} else if (clause.size() < 2 || (clause[0] != '+' && clause[1] != '=')) {
throw InvalidModeStringException("Invalid mode clause specification '" + clause + "'");
}
switch (clause[0]) {
case 'u':
for (string::size_type i = 2; i < clause.size(); i++) {
switch (clause[i]) {
case 'r':
modeBits |= S_IRUSR;
break;
case 'w':
modeBits |= S_IWUSR;
break;
case 'x':
modeBits |= S_IXUSR;
break;
case 's':
modeBits |= S_ISUID;
break;
default:
throw InvalidModeStringException("Invalid permission '" +
string(1, clause[i]) +
"' in mode clause specification '" +
clause + "'");
}
}
break;
case 'g':
for (string::size_type i = 2; i < clause.size(); i++) {
switch (clause[i]) {
case 'r':
modeBits |= S_IRGRP;
break;
case 'w':
modeBits |= S_IWGRP;
break;
case 'x':
modeBits |= S_IXGRP;
break;
case 's':
modeBits |= S_ISGID;
break;
default:
throw InvalidModeStringException("Invalid permission '" +
string(1, clause[i]) +
"' in mode clause specification '" +
clause + "'");
}
}
break;
case 'o':
for (string::size_type i = 2; i < clause.size(); i++) {
switch (clause[i]) {
case 'r':
modeBits |= S_IROTH;
break;
case 'w':
modeBits |= S_IWOTH;
break;
case 'x':
modeBits |= S_IXOTH;
break;
default:
throw InvalidModeStringException("Invalid permission '" +
string(1, clause[i]) +
"' in mode clause specification '" +
clause + "'");
}
}
break;
case '+':
for (string::size_type i = 1; i < clause.size(); i++) {
switch (clause[i]) {
case 't':
modeBits |= S_ISVTX;
break;
default:
throw InvalidModeStringException("Invalid permission '" +
string(1, clause[i]) +
"' in mode clause specification '" +
clause + "'");
}
}
break;
default:
throw InvalidModeStringException("Invalid owner '" + string(1, clause[0]) +
"' in mode clause specification '" + clause + "'");
}
}
return modeBits;
}
const char *
getSystemTempDir() {
const char *temp_dir = getenv("TMPDIR");
if (temp_dir == NULL || *temp_dir == '\0') {
temp_dir = "/tmp";
}
return temp_dir;
}
void
prestartWebApps(const ResourceLocator &locator, const string &ruby,
const vector<string> &prestartURLs)
{
/* Apache calls the initialization routines twice during startup, and
* as a result it starts two watchdogs, where the first one exits
* after a short idle period. We want any prespawning requests to reach
* the second watchdog, so we sleep for a short period before
* executing the prespawning scripts.
*/
syscalls::sleep(2);
vector<string>::const_iterator it;
string prespawnScript = locator.getHelperScriptsDir() + "/prespawn";
it = prestartURLs.begin();
while (it != prestartURLs.end() && !boost::this_thread::interruption_requested()) {
if (it->empty()) {
it++;
continue;
}
const char *command[] = {
ruby.c_str(),
prespawnScript.c_str(),
it->c_str(),
NULL
};
SubprocessInfo info;
runCommand(command, info);
syscalls::sleep(1);
it++;
}
}
void
runAndPrintExceptions(const boost::function<void ()> &func, bool toAbort) {
try {
func();
} catch (const boost::thread_interrupted &) {
throw;
} catch (const tracable_exception &e) {
P_ERROR("Exception: " << e.what() << "\n" << e.backtrace());
if (toAbort) {
abort();
}
}
}
void
runAndPrintExceptions(const boost::function<void ()> &func) {
runAndPrintExceptions(func, true);
}
string
getHostName() {
long hostNameMax = HOST_NAME_MAX;
if (hostNameMax < 255) {
// https://bugzilla.redhat.com/show_bug.cgi?id=130733
hostNameMax = 255;
}
string buf(hostNameMax + 1, '\0');
if (gethostname(&buf[0], hostNameMax + 1) == 0) {
buf[hostNameMax] = '\0';
return string(buf.c_str());
} else {
int e = errno;
throw SystemException("Unable to query the system's host name", e);
}
}
string
getSignalName(int sig) {
switch (sig) {
case SIGHUP:
return "SIGHUP";
case SIGINT:
return "SIGINT";
case SIGQUIT:
return "SIGQUIT";
case SIGILL:
return "SIGILL";
case SIGTRAP:
return "SIGTRAP";
case SIGABRT:
return "SIGABRT";
case SIGFPE:
return "SIGFPE";
case SIGKILL:
return "SIGKILL";
case SIGBUS:
return "SIGBUS";
case SIGSEGV:
return "SIGSEGV";
case SIGPIPE:
return "SIGPIPE";
case SIGALRM:
return "SIGARLM";
case SIGTERM:
return "SIGTERM";
case SIGUSR1:
return "SIGUSR1";
case SIGUSR2:
return "SIGUSR2";
#ifdef SIGEMT
case SIGEMT:
return "SIGEMT";
#endif
#ifdef SIGINFO
case SIGINFO:
return "SIGINFO";
#endif
default:
return toString(sig);
}
}
void
breakpoint() {
// No-op.
}
} // namespace Passenger
Zerion Mini Shell 1.0