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|
/**
\file env_universal_common.c
The utility library for universal variables. Used both by the
client library and by the daemon.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <pwd.h>
#include <errno.h>
#include <sys/stat.h>
#include <dirent.h>
#include <wctype.h>
#include <iconv.h>
#include <errno.h>
#include <locale.h>
#include <dirent.h>
#include <signal.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include "fallback.h"
#include "util.h"
#include "common.h"
#include "wutil.h"
#include "env_universal_common.h"
/**
Non-wide version of the set command
*/
#define SET_MBS "SET"
/**
Non-wide version of the set_export command
*/
#define SET_EXPORT_MBS "SET_EXPORT"
/**
Non-wide version of the erase command
*/
#define ERASE_MBS "ERASE"
/**
Non-wide version of the barrier command
*/
#define BARRIER_MBS "BARRIER"
/**
Non-wide version of the barrier_reply command
*/
#define BARRIER_REPLY_MBS "BARRIER_REPLY"
/**
Error message
*/
#define PARSE_ERR L"Unable to parse universal variable message: '%ls'"
/**
ERROR string for internal buffered reader
*/
#define ENV_UNIVERSAL_ERROR 0x100
/**
EAGAIN string for internal buffered reader
*/
#define ENV_UNIVERSAL_AGAIN 0x101
/**
EOF string for internal buffered reader
*/
#define ENV_UNIVERSAL_EOF 0x102
/**
A variable entry. Stores the value of a variable and whether it
should be exported. Obviously, it needs to be allocated large
enough to fit the value string.
*/
typedef struct var_uni_entry
{
int exportv; /**< Whether the variable should be exported */
wchar_t val[1]; /**< The value of the variable */
}
var_uni_entry_t;
static void parse_message( wchar_t *msg,
connection_t *src );
/**
The table of all universal variables
*/
hash_table_t env_universal_var;
/**
Callback function, should be called on all events
*/
void (*callback)( int type,
const wchar_t *key,
const wchar_t *val );
/**
Variable used by env_get_names to communicate auxiliary information
to add_key_to_hash
*/
static int get_names_show_exported;
/**
Variable used by env_get_names to communicate auxiliary information
to add_key_to_hash
*/
static int get_names_show_unexported;
/**
List of names for the UTF-8 character set.
*/
static char *iconv_utf8_names[]=
{
"utf-8", "UTF-8",
"utf8", "UTF8",
0
}
;
/**
List of wide character names, undefined byte length.
*/
static char *iconv_wide_names_unknown[]=
{
"wchar_t", "WCHAR_T",
"wchar", "WCHAR",
0
}
;
/**
List of wide character names, 4 bytes long.
*/
static char *iconv_wide_names_4[]=
{
"wchar_t", "WCHAR_T",
"wchar", "WCHAR",
"ucs-4", "UCS-4",
"ucs4", "UCS4",
"utf-32", "UTF-32",
"utf32", "UTF32",
0
}
;
/**
List of wide character names, 2 bytes long.
*/
static char *iconv_wide_names_2[]=
{
"wchar_t", "WCHAR_T",
"wchar", "WCHAR",
"ucs-2", "UCS-2",
"ucs2", "UCS2",
"utf-16", "UTF-16",
"utf16", "UTF16",
0
}
;
/**
Convert utf-8 string to wide string
*/
static wchar_t *utf2wcs( const char *in )
{
iconv_t cd=(iconv_t) -1;
int i,j;
wchar_t *out;
/*
Try to convert to wchar_t. If that is not a valid character set,
try various names for ucs-4. We can't be sure that ucs-4 is
really the character set used by wchar_t, but it is the best
assumption we can make.
*/
char **to_name=0;
switch (sizeof (wchar_t))
{
case 2:
to_name = iconv_wide_names_2;
break;
case 4:
to_name = iconv_wide_names_4;
break;
default:
to_name = iconv_wide_names_unknown;
break;
}
/*
The line protocol fish uses is always utf-8.
*/
char **from_name = iconv_utf8_names;
size_t in_len = strlen( in );
size_t out_len = sizeof( wchar_t )*(in_len+2);
size_t nconv;
char *nout;
out = (wchar_t *)malloc( out_len );
nout = (char *)out;
if( !out )
return 0;
for( i=0; to_name[i]; i++ )
{
for( j=0; from_name[j]; j++ )
{
cd = iconv_open ( to_name[i], from_name[j] );
if( cd != (iconv_t) -1)
{
goto start_conversion;
}
}
}
start_conversion:
if (cd == (iconv_t) -1)
{
/* Something went wrong. */
debug( 0, L"Could not perform utf-8 conversion" );
if(errno != EINVAL)
wperror( L"iconv_open" );
/* Terminate the output string. */
free(out);
return 0;
}
nconv = iconv( cd, (char **)&in, &in_len, &nout, &out_len );
if (nconv == (size_t) -1)
{
debug( 0, L"Error while converting from utf string" );
return 0;
}
*((wchar_t *) nout) = L'\0';
/*
Check for silly iconv behaviour inserting an bytemark in the output
string.
*/
if (*out == L'\xfeff' || *out == L'\xffef' || *out == L'\xefbbbf')
{
wchar_t *out_old = out;
out = wcsdup(out+1);
if (! out )
{
debug(0, L"FNORD!!!!");
free( out_old );
return 0;
}
free( out_old );
}
if (iconv_close (cd) != 0)
wperror (L"iconv_close");
return out;
}
/**
Convert wide string to utf-8
*/
static char *wcs2utf( const wchar_t *in )
{
iconv_t cd=(iconv_t) -1;
int i,j;
char *char_in = (char *)in;
char *out;
/*
Try to convert to wchar_t. If that is not a valid character set,
try various names for ucs-4. We can't be sure that ucs-4 is
really the character set used by wchar_t, but it is the best
assumption we can make.
*/
char **from_name=0;
switch (sizeof (wchar_t))
{
case 2:
from_name = iconv_wide_names_2;
break;
case 4:
from_name = iconv_wide_names_4;
break;
default:
from_name = iconv_wide_names_unknown;
break;
}
char **to_name = iconv_utf8_names;
size_t in_len = wcslen( in );
size_t out_len = sizeof( char )*( (MAX_UTF8_BYTES*in_len)+1);
size_t nconv;
char *nout;
out = (char *)malloc( out_len );
nout = (char *)out;
in_len *= sizeof( wchar_t );
if( !out )
return 0;
for( i=0; to_name[i]; i++ )
{
for( j=0; from_name[j]; j++ )
{
cd = iconv_open ( to_name[i], from_name[j] );
if( cd != (iconv_t) -1)
{
goto start_conversion;
}
}
}
start_conversion:
if (cd == (iconv_t) -1)
{
/* Something went wrong. */
debug( 0, L"Could not perform utf-8 conversion" );
if(errno != EINVAL)
wperror( L"iconv_open" );
/* Terminate the output string. */
free(out);
return 0;
}
nconv = iconv( cd, &char_in, &in_len, &nout, &out_len );
if (nconv == (size_t) -1)
{
debug( 0, L"%d %d", in_len, out_len );
debug( 0, L"Error while converting from to string" );
return 0;
}
*nout = '\0';
if (iconv_close (cd) != 0)
wperror (L"iconv_close");
return out;
}
void env_universal_common_init( void (*cb)(int type, const wchar_t *key, const wchar_t *val ) )
{
callback = cb;
hash_init( &env_universal_var, &hash_wcs_func, &hash_wcs_cmp );
}
/**
Free both key and data
*/
static void erase( void *key,
void *data )
{
free( (void *)key );
free( (void *)data );
}
void env_universal_common_destroy()
{
hash_foreach( &env_universal_var, &erase );
hash_destroy( &env_universal_var );
}
/**
Read one byte of date form the specified connection
*/
static int read_byte( connection_t *src )
{
if( src->buffer_consumed >= src->buffer_used )
{
int res;
res = read( src->fd, src->buffer, ENV_UNIVERSAL_BUFFER_SIZE );
// debug(4, L"Read chunk '%.*s'", res, src->buffer );
if( res < 0 )
{
if( errno == EAGAIN ||
errno == EINTR )
{
return ENV_UNIVERSAL_AGAIN;
}
return ENV_UNIVERSAL_ERROR;
}
if( res == 0 )
{
return ENV_UNIVERSAL_EOF;
}
src->buffer_consumed = 0;
src->buffer_used = res;
}
return src->buffer[src->buffer_consumed++];
}
void read_message( connection_t *src )
{
while( 1 )
{
int ib = read_byte( src );
char b;
switch( ib )
{
case ENV_UNIVERSAL_AGAIN:
{
return;
}
case ENV_UNIVERSAL_ERROR:
{
debug( 2, L"Read error on fd %d, set killme flag", src->fd );
if( debug_level > 2 )
wperror( L"read" );
src->killme = 1;
return;
}
case ENV_UNIVERSAL_EOF:
{
src->killme = 1;
debug( 3, L"Fd %d has reached eof, set killme flag", src->fd );
if( src->input.used > 0 )
{
char c = 0;
b_append( &src->input, &c, 1 );
debug( 1,
L"Universal variable connection closed while reading command. Partial command recieved: '%s'",
(wchar_t *)src->input.buff );
}
return;
}
}
b = (char)ib;
if( b == '\n' )
{
wchar_t *msg;
b = 0;
b_append( &src->input, &b, 1 );
msg = utf2wcs( src->input.buff );
/*
Before calling parse_message, we must empty reset
everything, since the callback function could
potentially call read_message.
*/
src->input.used=0;
if( msg )
{
parse_message( msg, src );
}
else
{
debug( 0, _(L"Could not convert message '%s' to wide character string"), src->input.buff );
}
free( msg );
}
else
{
b_append( &src->input, &b, 1 );
}
}
}
/**
Remove variable with specified name
*/
void env_universal_common_remove( const wchar_t *name )
{
void *k, *v;
hash_remove( &env_universal_var,
name,
&k,
&v );
free( k );
free( v );
}
/**
Test if the message msg contains the command cmd
*/
static int match( const wchar_t *msg, const wchar_t *cmd )
{
size_t len = wcslen( cmd );
if( wcsncasecmp( msg, cmd, len ) != 0 )
return 0;
if( msg[len] && msg[len]!= L' ' && msg[len] != L'\t' )
return 0;
return 1;
}
void env_universal_common_set( const wchar_t *key, const wchar_t *val, int exportv )
{
var_uni_entry_t *entry;
wchar_t *name;
CHECK( key, );
CHECK( val, );
entry = (var_uni_entry_t *)malloc( sizeof(var_uni_entry_t) + sizeof(wchar_t)*(wcslen(val)+1) );
name = wcsdup(key);
if( !entry || !name )
DIE_MEM();
entry->exportv=exportv;
wcscpy( entry->val, val );
env_universal_common_remove( name );
hash_put( &env_universal_var, name, entry );
if( callback )
{
callback( exportv?SET_EXPORT:SET, name, val );
}
}
/**
Parse message msg
*/
static void parse_message( wchar_t *msg,
connection_t *src )
{
// debug( 3, L"parse_message( %ls );", msg );
if( msg[0] == L'#' )
return;
if( match( msg, SET_STR ) || match( msg, SET_EXPORT_STR ))
{
wchar_t *name, *tmp;
int exportv = match( msg, SET_EXPORT_STR );
name = msg+(exportv?wcslen(SET_EXPORT_STR):wcslen(SET_STR));
while( wcschr( L"\t ", *name ) )
name++;
tmp = wcschr( name, L':' );
if( tmp )
{
wchar_t *key;
wchar_t *val;
key = (wchar_t *)malloc( sizeof( wchar_t)*(tmp-name+1));
memcpy( key, name, sizeof( wchar_t)*(tmp-name));
key[tmp-name]=0;
val = tmp+1;
val = unescape( val, 0 );
env_universal_common_set( key, val, exportv );
free( val );
free( key );
}
else
{
debug( 1, PARSE_ERR, msg );
}
}
else if( match( msg, ERASE_STR ) )
{
wchar_t *name, *tmp;
name = msg+wcslen(ERASE_STR);
while( wcschr( L"\t ", *name ) )
name++;
tmp = name;
while( iswalnum( *tmp ) || *tmp == L'_')
tmp++;
*tmp = 0;
if( !wcslen( name ) )
{
debug( 1, PARSE_ERR, msg );
}
env_universal_common_remove( name );
if( callback )
{
callback( ERASE, name, 0 );
}
}
else if( match( msg, BARRIER_STR) )
{
message_t *msg = create_message( BARRIER_REPLY, 0, 0 );
msg->count = 1;
src->unsent->push(msg);
try_send_all( src );
}
else if( match( msg, BARRIER_REPLY_STR ) )
{
if( callback )
{
callback( BARRIER_REPLY, 0, 0 );
}
}
else
{
debug( 1, PARSE_ERR, msg );
}
}
/**
Attempt to send the specified message to the specified file descriptor
\return 1 on sucess, 0 if the message could not be sent without blocking and -1 on error
*/
static int try_send( message_t *msg,
int fd )
{
debug( 3,
L"before write of %d chars to fd %d", strlen(msg->body), fd );
int res = write( fd, msg->body, strlen(msg->body) );
if( res != -1 )
{
debug( 4, L"Wrote message '%s'", msg->body );
}
else
{
debug( 4, L"Failed to write message '%s'", msg->body );
}
if( res == -1 )
{
switch( errno )
{
case EAGAIN:
return 0;
default:
debug( 2,
L"Error while sending universal variable message to fd %d. Closing connection",
fd );
if( debug_level > 2 )
wperror( L"write" );
return -1;
}
}
msg->count--;
if( !msg->count )
{
free( msg );
}
return 1;
}
void try_send_all( connection_t *c )
{
/* debug( 3,
L"Send all updates to connection on fd %d",
c->fd );*/
while( !c->unsent->empty() )
{
switch( try_send( c->unsent->front(), c->fd ) )
{
case 1:
c->unsent->pop();
break;
case 0:
debug( 4,
L"Socket full, send rest later" );
return;
case -1:
c->killme = 1;
return;
}
}
}
/**
Escape specified string
*/
static wchar_t *full_escape( const wchar_t *in )
{
string_buffer_t out;
sb_init( &out );
for( ; *in; in++ )
{
if( *in < 32 )
{
sb_printf( &out, L"\\x%.2x", *in );
}
else if( *in < 128 )
{
sb_append_char( &out, *in );
}
else if( *in < 65536 )
{
sb_printf( &out, L"\\u%.4x", *in );
}
else
{
sb_printf( &out, L"\\U%.8x", *in );
}
}
return (wchar_t *)out.buff;
}
message_t *create_message( int type,
const wchar_t *key_in,
const wchar_t *val_in )
{
message_t *msg=0;
char *key=0;
size_t sz;
// debug( 4, L"Crete message of type %d", type );
if( key_in )
{
if( wcsvarname( key_in ) )
{
debug( 0, L"Illegal variable name: '%ls'", key_in );
return 0;
}
key = wcs2utf(key_in);
if( !key )
{
debug( 0,
L"Could not convert %ls to narrow character string",
key_in );
return 0;
}
}
switch( type )
{
case SET:
case SET_EXPORT:
{
if( !val_in )
{
val_in=L"";
}
wchar_t *esc = full_escape( val_in );
if( !esc )
break;
char *val = wcs2utf(esc );
free(esc);
sz = strlen(type==SET?SET_MBS:SET_EXPORT_MBS) + strlen(key) + strlen(val) + 4;
msg = (message_t *)malloc( sizeof( message_t ) + sz );
if( !msg )
DIE_MEM();
strcpy( msg->body, (type==SET?SET_MBS:SET_EXPORT_MBS) );
strcat( msg->body, " " );
strcat( msg->body, key );
strcat( msg->body, ":" );
strcat( msg->body, val );
strcat( msg->body, "\n" );
free( val );
break;
}
case ERASE:
{
sz = strlen(ERASE_MBS) + strlen(key) + 3;
msg = (message_t *)malloc( sizeof( message_t ) + sz );
if( !msg )
DIE_MEM();
strcpy( msg->body, ERASE_MBS " " );
strcat( msg->body, key );
strcat( msg->body, "\n" );
break;
}
case BARRIER:
{
msg = (message_t *)malloc( sizeof( message_t ) +
strlen( BARRIER_MBS ) +2);
if( !msg )
DIE_MEM();
strcpy( msg->body, BARRIER_MBS "\n" );
break;
}
case BARRIER_REPLY:
{
msg = (message_t *)malloc( sizeof( message_t ) +
strlen( BARRIER_REPLY_MBS ) +2);
if( !msg )
DIE_MEM();
strcpy( msg->body, BARRIER_REPLY_MBS "\n" );
break;
}
default:
{
debug( 0, L"create_message: Unknown message type" );
}
}
free( key );
if( msg )
msg->count=0;
// debug( 4, L"Message body is '%s'", msg->body );
return msg;
}
/**
Function used with hash_foreach to insert keys of one table into
another
*/
static void add_key_to_hash( void *key,
void *data,
void *aux )
{
var_uni_entry_t *e = (var_uni_entry_t *)data;
if( ( e->exportv && get_names_show_exported) ||
( !e->exportv && get_names_show_unexported) )
al_push( (array_list_t *)aux, key );
}
static void add_key_to_hash2( void *key,
void *data,
void *aux )
{
wcstring_list_t &lst = *(wcstring_list_t *)aux;
var_uni_entry_t *e = (var_uni_entry_t *)data;
if( ( e->exportv && get_names_show_exported) ||
( !e->exportv && get_names_show_unexported) )
lst.push_back((wchar_t *)key);
}
void env_universal_common_get_names( array_list_t *l,
int show_exported,
int show_unexported )
{
get_names_show_exported = show_exported;
get_names_show_unexported = show_unexported;
hash_foreach2( &env_universal_var,
add_key_to_hash,
l );
}
void env_universal_common_get_names2( wcstring_list_t &lst,
int show_exported,
int show_unexported )
{
get_names_show_exported = show_exported;
get_names_show_unexported = show_unexported;
hash_foreach2( &env_universal_var,
add_key_to_hash2,
&lst );
}
wchar_t *env_universal_common_get( const wchar_t *name )
{
var_uni_entry_t *e = (var_uni_entry_t *)hash_get( &env_universal_var, name );
if( e )
return e->val;
return 0;
}
int env_universal_common_get_export( const wchar_t *name )
{
var_uni_entry_t *e = (var_uni_entry_t *)hash_get( &env_universal_var, name );
if( e )
return e->exportv;
return 0;
}
/**
Adds a variable creation message about the specified variable to
the specified queue. The function signature is non-obvious since
this function is used together with hash_foreach2, which requires
the specified function signature.
\param k the variable name
\param v the variable value
\param q the queue to add the message to
*/
static void enqueue( void *k,
void *v,
void *q)
{
const wchar_t *key = (const wchar_t *)k;
const var_uni_entry_t *val = (const var_uni_entry_t *)v;
message_queue_t *queue = (message_queue_t *)q;
message_t *msg = create_message( val->exportv?SET_EXPORT:SET, key, val->val );
msg->count=1;
queue->push(msg);
}
void enqueue_all( connection_t *c )
{
hash_foreach2( &env_universal_var,
&enqueue,
(void *)c->unsent );
try_send_all( c );
}
void connection_init( connection_t *c, int fd )
{
memset (c, 0, sizeof (connection_t));
c->fd = fd;
b_init( &c->input );
c->unsent = new std::queue<message_t *>;
c->buffer_consumed = c->buffer_used = 0;
}
void connection_destroy( connection_t *c)
{
if (c->unsent) delete c->unsent;
b_destroy( &c->input );
/*
A connection need not always be open - we only try to close it
if it is open.
*/
if( c->fd >= 0 )
{
if( close( c->fd ) )
{
wperror( L"close" );
}
}
}
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