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arts/mcop/mcoputils.cc

588 lines
14 KiB

/*
Copyright (C) 2000 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "mcoputils.h"
#include "mcopconfig.h"
#include "debug.h"
#include <pwd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <netdb.h>
#include <errno.h>
#include <config.h>
#include <ctype.h>
#include <cstdlib>
#include <cstring>
#include <stdio.h>
#include <map>
#include <limits.h>
using namespace std;
using namespace Arts;
// 0: Dir ok
// 1: Dir not ok
static int check_tmp_dir(const char *tmp_dir)
{
int result;
struct stat stat_buf;
result = lstat(tmp_dir, &stat_buf);
if ((result == -1) && (errno == ENOENT))
{
result = mkdir(tmp_dir, 0700);
if (result == -1)
{
arts_warning("Error: Cannot create directory \"%s\".\n", tmp_dir);
return 1;
}
result = stat(tmp_dir, &stat_buf);
}
if ((result == -1) || (!S_ISDIR(stat_buf.st_mode)))
{
arts_warning("Error: \"%s\" is not a directory.\n", tmp_dir);
return 1;
}
if (stat_buf.st_uid != getuid())
{
arts_warning("Error: \"%s\" is owned by uid %d instead of uid %d.\n", tmp_dir, stat_buf.st_uid, getuid());
return 1;
}
return 0;
}
// 0: Link not ok
// != 0: location of mcop directory
static char *locate_mcop_dir()
{
struct passwd *pw_ent;
string kde_tmp_dir;
string user_tmp_dir;
int uid = getuid();
const char *home_dir = getenv("HOME");
const char *kde_home = uid ? getenv("KDEHOME") : getenv("KDEROOTHOME");
const char *kde_prefix = "/socket-";
const char *tmp;
char *tmp_buf;
int result;
struct stat stat_buf;
tmp = getenv("KDETMP");
if (!tmp || !tmp[0])
tmp = getenv("TMPDIR");
if (!tmp || !tmp[0])
tmp = "/tmp";
kde_tmp_dir = "";
pw_ent = getpwuid(uid);
if (!pw_ent)
{
arts_warning("Error: Can not find password entry for uid %d.\n", getuid());
return 0;
}
user_tmp_dir = string(tmp) + "/ksocket-" + string(pw_ent->pw_name);
if (!kde_home || !kde_home[0])
{
kde_home = "~/.kde/";
}
if (kde_home[0] == '~')
{
if (uid == 0)
{
home_dir = pw_ent->pw_dir ? pw_ent->pw_dir : "/root";
}
if (!home_dir || !home_dir[0])
{
arts_fatal("Aborting. $HOME not set!");
}
kde_home++;
kde_tmp_dir = string(home_dir);
}
kde_tmp_dir += kde_home;
/** Strip trailing '/' **/
if ( kde_tmp_dir[kde_tmp_dir.length()-1] == '/')
kde_tmp_dir.resize(kde_tmp_dir.length()-1);
result = stat(kde_tmp_dir.c_str(), &stat_buf);
if (result == -1)
{
return 0;
}
kde_tmp_dir += kde_prefix;
{
char buf[1024];
if (gethostname(buf, sizeof(buf)-1) != 0)
{
arts_fatal("Aborting. Could not determine hostname or hostname too long.");
}
buf[sizeof(buf)-1] = '\0';
kde_tmp_dir += buf;
}
result = lstat(kde_tmp_dir.c_str(), &stat_buf);
if ((result == 0) && (S_ISDIR(stat_buf.st_mode)))
{
/* $KDEHOME/socket-$HOSTNAME is a normal directory. Do nothing. */
tmp_buf = strdup(kde_tmp_dir.c_str());
return tmp_buf;
}
if ((result == -1) && (errno == ENOENT))
{
// Link mising...
return 0;
}
if ((result == -1) || (!S_ISLNK(stat_buf.st_mode)))
{
arts_warning("Error: \"%s\" is not a link or a directory.\n", kde_tmp_dir.c_str());
return 0;
}
/* kde_tmp_dir is a link. Check whether it points to a valid directory. */
ssize_t size = 2048;
tmp_buf = NULL;
do {
size *= 2;
tmp_buf = (char *) realloc(tmp_buf, size);
if (!tmp_buf)
return 0;
result = readlink(kde_tmp_dir.c_str(), tmp_buf, size - 1);
if (result == -1)
{
arts_warning("Error: \"%s\" could not be read.\n", kde_tmp_dir.c_str());
free(tmp_buf);
return 0;
}
} while(result == size - 1);
tmp_buf[result] = '\0';
// printf("Link points to \"%s\"\n", tmp_buf);
if (strncmp(tmp_buf, user_tmp_dir.c_str(), user_tmp_dir.length()) != 0)
{
arts_warning("Error: \"%s\" points to \"%s\" instead of \"%s\".\n", kde_tmp_dir.c_str(), tmp_buf, user_tmp_dir.c_str());
free(tmp_buf);
return 0;
}
result = check_tmp_dir(tmp_buf);
if (result == 0) return tmp_buf; /* Success */
free(tmp_buf);
return 0;
}
/* blatant and literal copy from lnusertemp to avoid kdelibs dependency */
/* Copyright (c) 2000 Waldo Bastian <bastian@kde.org>, released under LGPL */
static
int create_link(const char *file, const char *tmp_dir)
{
int result;
result = check_tmp_dir(tmp_dir);
if (result)
{
return result;
}
result = symlink(tmp_dir, file);
if (result == -1)
{
fprintf(stderr, "Error: Can not create link from \"%s\" to \"%s\"\n", file, tmp_dir);
return 1;
}
printf("Created link from \"%s\" to \"%s\"\n", file, tmp_dir);
return 0;
}
static
int build_link(string tmp_prefix, const char *kde_prefix)
{
struct passwd *pw_ent;
string kde_tmp_dir;
string user_tmp_dir;
char *tmp_buf;
int uid = getuid();
const char *home_dir = getenv("HOME");
const char *kde_home = uid ? getenv("KDEHOME") : getenv("KDEROOTHOME");
int result;
struct stat stat_buf;
kde_tmp_dir = "";
pw_ent = getpwuid(uid);
if (!pw_ent)
{
fprintf(stderr, "Error: Can not find password entry for uid %d.\n", getuid());
return 1;
}
user_tmp_dir = tmp_prefix + string(pw_ent->pw_name);
if (!kde_home || !kde_home[0])
{
kde_home = "~/.kde/";
}
if (kde_home[0] == '~')
{
if (uid == 0)
{
home_dir = pw_ent->pw_dir ? pw_ent->pw_dir : "/root";
}
if (!home_dir || !home_dir[0])
{
fprintf(stderr, "Aborting. $HOME not set!");
exit(255);
}
kde_home++;
kde_tmp_dir = string(home_dir);
}
kde_tmp_dir += kde_home;
/** Strip trailing '/' **/
if ( kde_tmp_dir[kde_tmp_dir.length()-1] == '/')
kde_tmp_dir.resize(kde_tmp_dir.length()-1);
result = stat(kde_tmp_dir.c_str(), &stat_buf);
if ((result == -1) && (errno == ENOENT))
{
result = mkdir(kde_tmp_dir.c_str(), 0700);
}
if (result == -1)
{
return 1;
}
kde_tmp_dir += kde_prefix;
{
char buf[1024];
if (gethostname(buf, sizeof(buf)-1) != 0)
{
arts_fatal("Aborting. Could not determine hostname or hostname too long.");
}
buf[sizeof(buf)-1] = '\0';
kde_tmp_dir += buf;
}
result = lstat(kde_tmp_dir.c_str(), &stat_buf);
if ((result == 0) && (S_ISDIR(stat_buf.st_mode)))
{
/* $KDEHOME/tmp is a normal directory. Do nothing. */
printf("Directory \"%s\" already exists.\n", kde_tmp_dir.c_str());
return 0;
}
if ((result == -1) && (errno == ENOENT))
{
printf("Creating link %s.\n", kde_tmp_dir.c_str());
result = create_link(kde_tmp_dir.c_str(), user_tmp_dir.c_str());
if (result == 0) return 0; /* Success */
unlink(kde_tmp_dir.c_str());
user_tmp_dir += "XXXXXX";
tmp_buf = strdup(user_tmp_dir.c_str());
mktemp(tmp_buf); /* We want a directory, not a file, so using mkstemp makes no sense and is wrong */
result = create_link(kde_tmp_dir.c_str(), tmp_buf);
free(tmp_buf);
return result;
}
if ((result == -1) || (!S_ISLNK(stat_buf.st_mode)))
{
fprintf(stderr, "Error: \"%s\" is not a link or a directory.\n", kde_tmp_dir.c_str());
return 1;
}
/* kde_tmp_dir is a link. Check whether it points to a valid directory. */
ssize_t size = 2048;
tmp_buf = NULL;
do {
size *= 2;
tmp_buf = (char *) realloc(tmp_buf, size);
if (!tmp_buf)
return 0;
result = readlink(kde_tmp_dir.c_str(), tmp_buf, size - 1);
if (result == -1)
{
arts_warning("Error: \"%s\" could not be read.\n", kde_tmp_dir.c_str());
free(tmp_buf);
return 0;
}
} while(result == size - 1);
tmp_buf[result] = '\0';
printf("Link points to \"%s\"\n", tmp_buf);
if (strncmp(tmp_buf, user_tmp_dir.c_str(), user_tmp_dir.length()) != 0)
{
fprintf(stderr, "Error: \"%s\" points to \"%s\" instead of \"%s\".\n", kde_tmp_dir.c_str(), tmp_buf, user_tmp_dir.c_str());
free(tmp_buf);
unlink(kde_tmp_dir.c_str());
printf("Creating link %s.\n", kde_tmp_dir.c_str());
result = create_link(kde_tmp_dir.c_str(), user_tmp_dir.c_str());
if (result == 0) return 0; /* Success */
unlink(kde_tmp_dir.c_str());
user_tmp_dir += "XXXXXX";
tmp_buf = strdup(user_tmp_dir.c_str());
mktemp(tmp_buf); /* We want a directory, not a file, so using mkstemp makes no sense and is wrong */
result = create_link(kde_tmp_dir.c_str(), tmp_buf);
free(tmp_buf);
return result;
}
result = check_tmp_dir(tmp_buf);
free(tmp_buf);
if (result == 0) return 0; /* Success */
unlink(kde_tmp_dir.c_str());
user_tmp_dir += "XXXXXX";
tmp_buf = strdup(user_tmp_dir.c_str());
mktemp(tmp_buf); /* We want a directory, not a file, so using mkstemp makes no sense and is wrong */
result = create_link(kde_tmp_dir.c_str(), tmp_buf);
free(tmp_buf);
return result;
}
string MCOPUtils::createFilePath(string name)
{
static char *mcop_dir = 0;
if (!mcop_dir)
{
mcop_dir = locate_mcop_dir();
}
if (!mcop_dir)
{
const char *tmp = 0;
tmp = getenv("KDETMP");
if (!tmp || !tmp[0])
tmp = getenv("TMPDIR");
if (!tmp || !tmp[0])
tmp = "/tmp";
build_link(string(tmp) + "/ksocket-", "/socket-");
mcop_dir = locate_mcop_dir();
}
if (!mcop_dir)
{
arts_fatal("can't create mcop directory");
}
string tmpdir = mcop_dir;
return tmpdir+"/"+name;
}
/*
* try to figure out full hostname - this is important as every client which
* tries to connect objects located here will need to be able to resolve that
* correctly
*/
string MCOPUtils::getFullHostname()
{
char buffer[1024];
string result;
struct hostent *hp;
if(gethostname(buffer,1024) == 0) {
buffer[1023] = '\0';
result = buffer;
} else
return "localhost";
/*
* if gethostname() isn't a FQDN (guess that by checking whether it
* contains a dot), try to look it up to ensure it is
*/
if(result.find('.') == string::npos && (hp = gethostbyname(buffer)) != 0)
result = hp->h_name;
return result;
}
string MCOPUtils::readConfigEntry(const string& key, const string& defaultValue)
{
const char *home = getenv("HOME");
if(home)
{
string rcname = home + string("/.mcoprc");
MCOPConfig config(rcname);
return config.readEntry(key,defaultValue);
}
return defaultValue;
}
/** IID generation **/
unsigned long MCOPUtils::makeIID(const string& interfaceName)
{
static map<string, unsigned long> *iidmapobj = 0;
static unsigned long nextiid = 1;
if(!iidmapobj) iidmapobj = new map<string,unsigned long>;
map<string,unsigned long>& iidmap = *iidmapobj;
if(iidmap.find(interfaceName) == iidmap.end()) {
iidmap[interfaceName] = nextiid++;
return nextiid-1; // no need to lookup in the map thrice
}
return iidmap[interfaceName];
}
static vector<string> *readPath(const string& name, const string& defaultValue)
{
vector<string> *result = 0;
const char *home = getenv("HOME");
if(home)
{
string rcname = home + string("/.mcoprc");
MCOPConfig config(rcname);
result = config.readListEntry(name);
}
if(!result)
result = new vector<string>;
if(result->empty())
result->push_back(defaultValue);
return result;
}
const vector<string> *MCOPUtils::extensionPath()
{
static vector<string> *result = 0;
if(!result) result = readPath("ExtensionPath", EXTENSION_DIR);
return result;
}
const vector<string> *MCOPUtils::traderPath()
{
static vector<string> *result = 0;
if(!result)
{
result = readPath("TraderPath", TRADER_DIR);
const char *home = getenv("HOME");
if(home) result->push_back(home + string("/.mcop/trader-cache"));
}
return result;
}
string MCOPUtils::mcopDirectory()
{
static bool initialized = false;
static string mcopDirectory;
if(initialized)
return mcopDirectory;
initialized = true;
const char *home = getenv("HOME");
arts_return_val_if_fail(home != 0, "");
mcopDirectory = home + string("/.mcop");
mkdir(home,0755);
if(mkdir(mcopDirectory.c_str(),0755) != 0)
{
string why = strerror(errno);
struct stat st;
stat(mcopDirectory.c_str(),&st);
if(!S_ISDIR(st.st_mode))
{
arts_warning("can't create directory %s (%s)",
mcopDirectory.c_str(), why.c_str());
mcopDirectory = "";
}
}
return mcopDirectory;
}
bool MCOPUtils::tokenize(const string& line, string& key,vector<string>& values)
{
string value;
enum { sKey, sValue, sValueQuoted, sValueQuotedEscaped, sBad } state;
state = sKey;
for(string::const_iterator i = line.begin(); i != line.end(); i++)
{
char c = *i;
unsigned char uc = static_cast<unsigned char>(c);
arts_assert(c != '\n');
if(state == sKey)
{
if(c == ' ' || c == '\t')
; // ignore
else if(isalnum(c))
key += c;
else if(c == '=')
state = sValue;
else
state = sBad;
}
else if(state == sValue)
{
if(c == ' ' || c == '\t')
; // ignore
else if(c == '"')
state = sValueQuoted;
else if(c == ',')
{
values.push_back(value);
value = "";
}
else if(uc > 32 && uc < 128)
value += c;
else
state = sBad;
}
else if(state == sValueQuoted)
{
if(c == '"')
state = sValue;
else if(c == '\\')
state = sValueQuotedEscaped;
else
value += c;
}
else if(state == sValueQuotedEscaped)
{
value += c;
state = sValueQuoted;
}
}
if(state == sValue)
values.push_back(value);
return(state != sBad);
}