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rofi/source/dialogs/ssh.c

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/*
* rofi
*
* MIT/X11 License
* Copyright © 2013-2021 Qball Cow <qball@gmpclient.org>
*
* 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.
*
*/
/**
* \ingroup SSHMode
* @{
*/
/**
* Log domain for the ssh modi.
*/
#define G_LOG_DOMAIN "Dialogs.Ssh"
#include <config.h>
#include <glib.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <dirent.h>
#include <strings.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <helper.h>
#include <glob.h>
#include "rofi.h"
#include "settings.h"
#include "history.h"
#include "dialogs/ssh.h"
/**
* Holding an ssh entry.
*/
typedef struct _SshEntry
{
/** SSH hostname */
char *hostname;
/** SSH port number */
int port;
} SshEntry;
/**
* The internal data structure holding the private data of the SSH Mode.
*/
typedef struct
{
GList *user_known_hosts;
/** List if available ssh hosts.*/
SshEntry *hosts_list;
/** Length of the #hosts_list.*/
unsigned int hosts_list_length;
} SSHModePrivateData;
/**
* Name of the history file where previously chosen hosts are stored.
*/
#define SSH_CACHE_FILE "rofi-2.sshcache"
/**
* Used in get_ssh() when splitting lines from the user's
* SSH config file into tokens.
*/
#define SSH_TOKEN_DELIM "= \t\r\n"
/**
* @param entry The host to connect too
*
* SSH into the selected host.
*
* @returns FALSE On failure, TRUE on success
*/
static int execshssh ( const SshEntry *entry )
{
char **args = NULL;
int argsv = 0;
gchar *portstr = NULL;
if ( entry->port > 0 ) {
portstr = g_strdup_printf ( "%d", entry->port );
}
helper_parse_setup ( config.ssh_command, &args, &argsv,
"{host}", entry->hostname,
"{port}", portstr,
(char *) 0 );
g_free ( portstr );
gsize l = strlen ( "Connecting to '' via rofi" ) + strlen ( entry->hostname ) + 1;
gchar *desc = g_newa ( gchar, l );
g_snprintf ( desc, l, "Connecting to '%s' via rofi", entry->hostname );
RofiHelperExecuteContext context = {
.name = "ssh",
.description = desc,
.command = "ssh",
};
return helper_execute ( NULL, args, "ssh ", entry->hostname, &context );
}
/**
* @param entry The host to connect too
*
* SSH into the selected host, if successful update history.
*/
static void exec_ssh ( const SshEntry *entry )
{
if ( !( entry->hostname ) || !( entry->hostname[0] ) ) {
return;
}
if ( !execshssh ( entry ) ) {
return;
}
// This happens in non-critical time (After launching app)
// It is allowed to be a bit slower.
char *path = g_build_filename ( cache_dir, SSH_CACHE_FILE, NULL );
// TODO update.
if ( entry->port > 0 ) {
char *store = g_strdup_printf ( "%s\x1F%d", entry->hostname, entry->port );
history_set ( path, store );
g_free ( store );
}
else {
history_set ( path, entry->hostname );
}
g_free ( path );
}
/**
* @param host The host to remove from history
*
* Remove host from history.
*/
static void delete_ssh ( const char *host )
{
if ( !host || !host[0] ) {
return;
}
char *path = g_build_filename ( cache_dir, SSH_CACHE_FILE, NULL );
history_remove ( path, host );
g_free ( path );
}
/**
* @param path Path of the known host file.
* @param retv list of hosts
* @param length pointer to length of list [in][out]
*
* Read 'known_hosts' file when entries are not hashed.
*
* @returns updated list of hosts.
*/
static SshEntry *read_known_hosts_file ( const char *path, SshEntry * retv, unsigned int *length )
{
FILE *fd = fopen ( path, "r" );
if ( fd != NULL ) {
char *buffer = NULL;
size_t buffer_length = 0;
// Reading one line per time.
while ( getline ( &buffer, &buffer_length, fd ) > 0 ) {
// Strip whitespace.
char *start = g_strstrip ( &( buffer[0] ) );
// Find start.
if ( *start == '#' || *start == '@' ) {
// skip comments or cert-authority or revoked items.
continue;
}
if ( *start == '|' ) {
// Skip hashed hostnames.
continue;
}
// Find end of hostname set.
char *end = strstr ( start, " " );
if ( end == NULL ) {
// Something is wrong.
continue;
}
*end = '\0';
char *sep = start;
start = strsep ( &sep, ", " );
while ( start ) {
int port = 0;
if ( start[0] == '[' ) {
start++;
char *end = strchr ( start, ']' );
if ( end[1] == ':' ) {
*end = '\0';
errno = 0;
gchar *endptr = NULL;
gint64 number = g_ascii_strtoll ( &( end[2] ), &endptr, 10 );
if ( errno != 0 ) {
g_warning ( "Failed to parse port number: %s.", &( end[2] ) );
}
else if ( endptr == &( end[2] ) ) {
g_warning ( "Failed to parse port number: %s, invalid number.", &( end[2] ) );
}
else if ( number < 0 || number > 65535 ) {
g_warning ( "Failed to parse port number: %s, out of range.", &( end[2] ) );
}
else {
port = number;
}
}
}
// Is this host name already in the list?
// We often get duplicates in hosts file, so lets check this.
int found = 0;
for ( unsigned int j = 0; j < ( *length ); j++ ) {
if ( !g_ascii_strcasecmp ( start, retv[j].hostname ) ) {
found = 1;
break;
}
}
if ( !found ) {
// Add this host name to the list.
retv = g_realloc ( retv, ( ( *length ) + 2 ) * sizeof ( SshEntry ) );
retv[( *length )].hostname = g_strdup ( start );
retv[( *length )].port = port;
retv[( *length ) + 1].hostname = NULL;
retv[( *length ) + 1].port = 0;
( *length )++;
}
start = strsep ( &sep, ", " );
}
}
if ( buffer != NULL ) {
free ( buffer );
}
if ( fclose ( fd ) != 0 ) {
g_warning ( "Failed to close hosts file: '%s'", g_strerror ( errno ) );
}
}
else {
g_debug ( "Failed to open KnownHostFile: '%s'", path );
}
return retv;
}
/**
* @param retv The list of hosts to update.
* @param length The length of the list retv [in][out]
*
* Read `/etc/hosts` and appends them to the list retv
*
* @returns an updated list with the added hosts.
*/
static SshEntry *read_hosts_file ( SshEntry * retv, unsigned int *length )
{
// Read the hosts file.
FILE *fd = fopen ( "/etc/hosts", "r" );
if ( fd != NULL ) {
char *buffer = NULL;
size_t buffer_length = 0;
// Reading one line per time.
while ( getline ( &buffer, &buffer_length, fd ) > 0 ) {
// Evaluate one line.
unsigned int index = 0, ti = 0;
char *token = buffer;
// Tokenize it.
do {
char c = buffer[index];
// Break on space, tab, newline and \0.
if ( c == ' ' || c == '\t' || c == '\n' || c == '\0' || c == '#' ) {
buffer[index] = '\0';
// Ignore empty tokens
if ( token[0] != '\0' ) {
ti++;
// and first token.
if ( ti > 1 ) {
// Is this host name already in the list?
// We often get duplicates in hosts file, so lets check this.
int found = 0;
for ( unsigned int j = 0; j < ( *length ); j++ ) {
if ( !g_ascii_strcasecmp ( token, retv[j].hostname ) ) {
found = 1;
break;
}
}
if ( !found ) {
// Add this host name to the list.
retv = g_realloc ( retv,
( ( *length ) + 2 ) * sizeof ( SshEntry ) );
retv[( *length )].hostname = g_strdup ( token );
retv[( *length )].port = 0;
retv[( *length ) + 1].hostname = NULL;
( *length )++;
}
}
}
// Set start to next element.
token = &buffer[index + 1];
// Everything after comment ignore.
if ( c == '#' ) {
break;
}
}
// Skip to the next entry.
index++;
} while ( buffer[index] != '\0' && buffer[index] != '#' );
}
if ( buffer != NULL ) {
free ( buffer );
}
if ( fclose ( fd ) != 0 ) {
g_warning ( "Failed to close hosts file: '%s'", g_strerror ( errno ) );
}
}
return retv;
}
static void add_known_hosts_file ( SSHModePrivateData *pd, const char *token )
{
GList *item = g_list_find_custom ( pd->user_known_hosts, token, (GCompareFunc) g_strcmp0 );
if ( item == NULL ) {
g_debug ( "Add '%s' to UserKnownHost list", token );
pd->user_known_hosts = g_list_append ( pd->user_known_hosts, g_strdup ( token ) );
}
else {
g_debug ( "File '%s' already in UserKnownHostsFile list", token );
}
}
static void parse_ssh_config_file ( SSHModePrivateData *pd, const char *filename, SshEntry **retv, unsigned int *length, unsigned int num_favorites )
{
FILE *fd = fopen ( filename, "r" );
g_debug ( "Parsing ssh config file: %s", filename );
if ( fd != NULL ) {
char *buffer = NULL;
size_t buffer_length = 0;
char *strtok_pointer = NULL;
while ( getline ( &buffer, &buffer_length, fd ) > 0 ) {
// Each line is either empty, a comment line starting with a '#'
// character or of the form "keyword [=] arguments", where there may
// be multiple (possibly quoted) arguments separated by whitespace.
// The keyword is separated from its arguments by whitespace OR by
// optional whitespace and a '=' character.
char *token = strtok_r ( buffer, SSH_TOKEN_DELIM, &strtok_pointer );
// Skip empty lines and comment lines. Also skip lines where the
// keyword is not "Host".
if ( !token || *token == '#' ) {
continue;
}
char *low_token = g_ascii_strdown ( token, -1 );
if ( g_strcmp0 ( low_token, "include" ) == 0 ) {
token = strtok_r ( NULL, SSH_TOKEN_DELIM, &strtok_pointer );
g_debug ( "Found Include: %s", token );
gchar *path = rofi_expand_path ( token );
gchar *full_path = NULL;
if ( !g_path_is_absolute ( path ) ) {
char *dirname = g_path_get_dirname ( filename );
full_path = g_build_filename ( dirname, path, NULL );
g_free ( dirname );
}
else {
full_path = g_strdup ( path );
}
glob_t globbuf = { .gl_pathc = 0, .gl_pathv = NULL, .gl_offs = 0 };
if ( glob ( full_path, 0, NULL, &globbuf ) == 0 ) {
for ( size_t iter = 0; iter < globbuf.gl_pathc; iter++ ) {
parse_ssh_config_file ( pd, globbuf.gl_pathv[iter], retv, length, num_favorites );
}
}
globfree ( &globbuf );
g_free ( full_path );
g_free ( path );
}
else if ( g_strcmp0 ( low_token, "userknownhostsfile" ) == 0 ) {
while ( ( token = strtok_r ( NULL, SSH_TOKEN_DELIM, &strtok_pointer ) ) ) {
g_debug ( "Found extra UserKnownHostsFile: %s", token );
add_known_hosts_file ( pd, token );
}
}
else if ( g_strcmp0 ( low_token, "host" ) == 0 ) {
// Now we know that this is a "Host" line.
// The "Host" keyword is followed by one more host names separated
// by whitespace; while host names may be quoted with double quotes
// to represent host names containing spaces, we don't support this
// (how many host names contain spaces?).
while ( ( token = strtok_r ( NULL, SSH_TOKEN_DELIM, &strtok_pointer ) ) ) {
// We do not want to show wildcard entries, as you cannot ssh to them.
const char *const sep = "*?";
if ( *token == '!' || strpbrk ( token, sep ) ) {
continue;
}
// If comment, skip from now on.
if ( *token == '#' ) {
break;
}
// Is this host name already in the history file?
// This is a nice little penalty, but doable? time will tell.
// given num_favorites is max 25.
int found = 0;
for ( unsigned int j = 0; j < num_favorites; j++ ) {
if ( !g_ascii_strcasecmp ( token, ( *retv )[j].hostname ) ) {
found = 1;
break;
}
}
if ( found ) {
continue;
}
// Add this host name to the list.
( *retv ) = g_realloc ( ( *retv ), ( ( *length ) + 2 ) * sizeof ( SshEntry ) );
( *retv )[( *length )].hostname = g_strdup ( token );
( *retv )[( *length )].port = 0;
( *retv )[( *length ) + 1].hostname = NULL;
( *length )++;
}
}
g_free ( low_token );
}
if ( buffer != NULL ) {
free ( buffer );
}
if ( fclose ( fd ) != 0 ) {
g_warning ( "Failed to close ssh configuration file: '%s'", g_strerror ( errno ) );
}
}
}
/**
* @param pd The plugin data handle
* @param length The number of found ssh hosts [out]
*
* Gets the list available SSH hosts.
*
* @returns an array of strings containing all the hosts.
*/
static SshEntry * get_ssh ( SSHModePrivateData *pd, unsigned int *length )
{
SshEntry *retv = NULL;
unsigned int num_favorites = 0;
char *path;
if ( g_get_home_dir () == NULL ) {
return NULL;
}
path = g_build_filename ( cache_dir, SSH_CACHE_FILE, NULL );
char **h = history_get_list ( path, length );
retv = malloc ( ( *length ) * sizeof ( SshEntry ) );
for ( unsigned int i = 0; i < ( *length ); i++ ) {
int port = 0;
char *portstr = strchr ( h[i], '\x1F' );
if ( portstr != NULL ) {
*portstr = '\0';
errno = 0;
gchar *endptr = NULL;
gint64 number = g_ascii_strtoll ( &( portstr[1] ), &endptr, 10 );
if ( errno != 0 ) {
g_warning ( "Failed to parse port number: %s.", &( portstr[1] ) );
}
else if ( endptr == &( portstr[1] ) ) {
g_warning ( "Failed to parse port number: %s, invalid number.", &( portstr[1] ) );
}
else if ( number < 0 || number > 65535 ) {
g_warning ( "Failed to parse port number: %s, out of range.", &( portstr[1] ) );
}
else {
port = number;
}
}
retv[i].hostname = h[i];
retv[i].port = port;
}
g_free ( h );
g_free ( path );
num_favorites = ( *length );
const char *hd = g_get_home_dir ();
path = g_build_filename ( hd, ".ssh", "config", NULL );
parse_ssh_config_file ( pd, path, &retv, length, num_favorites );
if ( config.parse_known_hosts == TRUE ) {
char *path = g_build_filename ( g_get_home_dir (), ".ssh", "known_hosts", NULL );
retv = read_known_hosts_file ( path, retv, length );
g_free ( path );
for ( GList *iter = g_list_first ( pd->user_known_hosts ); iter; iter = g_list_next ( iter ) ) {
char *path = rofi_expand_path ( (const char *) iter->data );
retv = read_known_hosts_file ( (const char *) path, retv, length );
g_free ( path );
}
}
if ( config.parse_hosts == TRUE ) {
retv = read_hosts_file ( retv, length );
}
g_free ( path );
return retv;
}
/**
* @param sw Object handle to the SSH Mode object
*
* Initializes the SSH Mode private data object and
* loads the relevant ssh information.
*/
static int ssh_mode_init ( Mode *sw )
{
if ( mode_get_private_data ( sw ) == NULL ) {
SSHModePrivateData *pd = g_malloc0 ( sizeof ( *pd ) );
mode_set_private_data ( sw, (void *) pd );
pd->hosts_list = get_ssh ( pd, &( pd->hosts_list_length ) );
}
return TRUE;
}
/**
* @param sw Object handle to the SSH Mode object
*
* Get the number of SSH entries.
*
* @returns the number of ssh entries.
*/
static unsigned int ssh_mode_get_num_entries ( const Mode *sw )
{
const SSHModePrivateData *rmpd = (const SSHModePrivateData *) mode_get_private_data ( sw );
return rmpd->hosts_list_length;
}
/**
* @param sw Object handle to the SSH Mode object
*
* Cleanup the SSH Mode. Free all allocated memory and NULL the private data pointer.
*/
static void ssh_mode_destroy ( Mode *sw )
{
SSHModePrivateData *rmpd = (SSHModePrivateData *) mode_get_private_data ( sw );
if ( rmpd != NULL ) {
for ( unsigned int i = 0; i < rmpd->hosts_list_length; i++ ) {
g_free ( rmpd->hosts_list[i].hostname );
}
g_list_free_full ( rmpd->user_known_hosts, g_free );
g_free ( rmpd->hosts_list );
g_free ( rmpd );
mode_set_private_data ( sw, NULL );
}
}
/**
* @param sw Object handle to the SSH Mode object
* @param mretv The menu return value.
* @param input Pointer to the user input string.
* @param selected_line the line selected by the user.
*
* Acts on the user interaction.
*
* @returns the next #ModeMode.
*/
static ModeMode ssh_mode_result ( Mode *sw, int mretv, char **input, unsigned int selected_line )
{
ModeMode retv = MODE_EXIT;
SSHModePrivateData *rmpd = (SSHModePrivateData *) mode_get_private_data ( sw );
if ( ( mretv & MENU_OK ) && rmpd->hosts_list[selected_line].hostname != NULL ) {
exec_ssh ( &( rmpd->hosts_list[selected_line] ) );
}
else if ( ( mretv & MENU_CUSTOM_INPUT ) && *input != NULL && *input[0] != '\0' ) {
SshEntry entry = { .hostname = *input, .port = 0 };
exec_ssh ( &entry );
}
else if ( ( mretv & MENU_ENTRY_DELETE ) && rmpd->hosts_list[selected_line].hostname ) {
delete_ssh ( rmpd->hosts_list[selected_line].hostname );
// Stay
retv = RELOAD_DIALOG;
ssh_mode_destroy ( sw );
ssh_mode_init ( sw );
}
else if ( mretv & MENU_CUSTOM_COMMAND ) {
retv = ( mretv & MENU_LOWER_MASK );
}
return retv;
}
/**
* @param sw Object handle to the SSH Mode object
* @param selected_line The line to view
* @param state The state of the entry [out]
* @param attr_list List of extra rendering attributes to set [out]
* @param get_entry
*
* Gets the string as it should be displayed and the display state.
* If get_entry is FALSE only the state is set.
*
* @return the string as it should be displayed and the display state.
*/
static char *_get_display_value ( const Mode *sw, unsigned int selected_line, G_GNUC_UNUSED int *state, G_GNUC_UNUSED GList **attr_list, int get_entry )
{
SSHModePrivateData *rmpd = (SSHModePrivateData *) mode_get_private_data ( sw );
return get_entry ? g_strdup ( rmpd->hosts_list[selected_line].hostname ) : NULL;
}
/**
* @param sw Object handle to the SSH Mode object
* @param tokens The set of tokens to match against
* @param index The index of the entry to match
*
* Match entry against the set of tokens.
*
* @returns TRUE if matches
*/
static int ssh_token_match ( const Mode *sw, rofi_int_matcher **tokens, unsigned int index )
{
SSHModePrivateData *rmpd = (SSHModePrivateData *) mode_get_private_data ( sw );
return helper_token_match ( tokens, rmpd->hosts_list[index].hostname );
}
#include "mode-private.h"
Mode ssh_mode =
{
.name = "ssh",
.cfg_name_key = "display-ssh",
._init = ssh_mode_init,
._get_num_entries = ssh_mode_get_num_entries,
._result = ssh_mode_result,
._destroy = ssh_mode_destroy,
._token_match = ssh_token_match,
._get_display_value = _get_display_value,
._get_completion = NULL,
._preprocess_input = NULL,
.private_data = NULL,
.free = NULL
};
/**@}*/
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