rofi/source/modes/ssh.c

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/*
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* rofi
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*
* MIT/X11 License
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* Copyright © 2013-2022 Qball Cow <qball@gmpclient.org>
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*
* 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.
*
*/
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/**
* \ingroup SSHMode
* @{
*/
/**
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* Log domain for the ssh mode.
*/
#define G_LOG_DOMAIN "Modes.Ssh"
#include <config.h>
#include <glib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
#include <glob.h>
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#include <helper.h>
#include <signal.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <unistd.h>
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#include "modes/ssh.h"
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#include "history.h"
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#include "rofi.h"
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#include "settings.h"
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/**
* Holding an ssh entry.
*/
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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.
*/
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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;
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/**
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* Name of the history file where previously chosen hosts are stored.
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*/
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#define SSH_CACHE_FILE "rofi-2.sshcache"
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/**
* Used in get_ssh() when splitting lines from the user's
* SSH config file into tokens.
*/
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#define SSH_TOKEN_DELIM "= \t\r\n"
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/**
* @param entry The host to connect too
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*
* SSH into the selected host.
*
* @returns FALSE On failure, TRUE on success
*/
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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);
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}
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/**
* @param entry The host to connect too
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*
* SSH into the selected host, if successful update history.
*/
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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);
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}
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/**
* @param host The host to remove from history
*
* Remove host from history.
*/
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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);
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}
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/**
* @param path Path of the known host file.
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* @param retv list of hosts
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* @param length pointer to length of list [in][out]
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*
* Read 'known_hosts' file when entries are not hashed.
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*
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* @returns updated list of hosts.
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*/
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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 *strend = strchr(start, ']');
if (strend[1] == ':') {
*strend = '\0';
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errno = 0;
gchar *endptr = NULL;
gint64 number = g_ascii_strtoll(&(strend[2]), &endptr, 10);
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if (errno != 0) {
g_warning("Failed to parse port number: %s.", &(strend[2]));
} else if (endptr == &(strend[2])) {
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g_warning("Failed to parse port number: %s, invalid number.",
&(strend[2]));
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} else if (number < 0 || number > 65535) {
g_warning("Failed to parse port number: %s, out of range.",
&(strend[2]));
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} else {
port = number;
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}
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}
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}
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// 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;
}
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}
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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)++;
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}
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start = strsep(&sep, ", ");
}
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}
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if (buffer != NULL) {
free(buffer);
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}
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if (fclose(fd) != 0) {
g_warning("Failed to close hosts file: '%s'", g_strerror(errno));
}
} else {
g_debug("Failed to open KnownHostFile: '%s'", path);
}
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return retv;
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}
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/**
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* @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.
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*/
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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;
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}
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}
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;
}
}
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// Skip to the next entry.
index++;
} while (buffer[index] != '\0' && buffer[index] != '#');
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}
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if (buffer != NULL) {
free(buffer);
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}
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if (fclose(fd) != 0) {
g_warning("Failed to close hosts file: '%s'", g_strerror(errno));
}
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}
return retv;
}
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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);
}
}
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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};
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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);
}
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}
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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);
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}
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} 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)++;
}
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}
g_free(low_token);
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}
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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.
*/
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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;
}
}
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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 *known_hosts_path =
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g_build_filename(g_get_home_dir(), ".ssh", "known_hosts", NULL);
retv = read_known_hosts_file(known_hosts_path, retv, length);
g_free(known_hosts_path);
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for (GList *iter = g_list_first(pd->user_known_hosts); iter;
iter = g_list_next(iter)) {
char *user_known_hosts_path = rofi_expand_path((const char *)iter->data);
retv = read_known_hosts_file((const char *)user_known_hosts_path, retv,
length);
g_free(user_known_hosts_path);
}
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}
if (config.parse_hosts == TRUE) {
retv = read_hosts_file(retv, length);
}
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g_free(path);
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return retv;
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}
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/**
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* @param sw Object handle to the SSH Mode object
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*
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* Initializes the SSH Mode private data object and
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* loads the relevant ssh information.
*/
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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;
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}
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/**
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* @param sw Object handle to the SSH Mode object
*
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* Get the number of SSH entries.
*
* @returns the number of ssh entries.
*/
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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;
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}
/**
* @param sw Object handle to the SSH Mode object
*
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* Cleanup the SSH Mode. Free all allocated memory and NULL the private data
* pointer.
*/
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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);
}
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g_list_free_full(rmpd->user_known_hosts, g_free);
g_free(rmpd->hosts_list);
g_free(rmpd);
mode_set_private_data(sw, NULL);
}
}
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/**
* @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.
*/
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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;
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}
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/**
* @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]
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* @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.
*/
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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;
}
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/**
* @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
*/
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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);
}
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#include "mode-private.h"
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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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/**@}*/