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/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "net.h"
#include "hash.h"
#include "doveadm.h"
#include "doveadm-who.h"
#include "doveadm-print.h"
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
struct kick_user {
const char *username;
bool kick_me; /* true if username and/or ip[/mask] matches.
ignored when the -f switch is given. */
};
struct kick_pid {
pid_t pid;
ARRAY(struct kick_user) users;
bool kick;
};
struct kick_context {
struct who_context who;
HASH_TABLE(void *, struct kick_pid *) pids;
enum doveadm_client_type conn_type;
bool force_kick;
ARRAY(const char *) kicked_users;
};
static void
kick_aggregate_line(struct who_context *_ctx, const struct who_line *line)
{
struct kick_context *ctx = (struct kick_context *)_ctx;
const bool user_match = who_line_filter_match(line, &ctx->who.filter);
struct kick_pid *k_pid;
struct kick_user new_user, *user;
i_zero(&new_user);
k_pid = hash_table_lookup(ctx->pids, POINTER_CAST(line->pid));
if (k_pid == NULL) {
k_pid = p_new(ctx->who.pool, struct kick_pid, 1);
k_pid->pid = line->pid;
p_array_init(&k_pid->users, ctx->who.pool, 5);
hash_table_insert(ctx->pids, POINTER_CAST(line->pid), k_pid);
}
array_foreach_modifiable(&k_pid->users, user) {
if (strcmp(line->username, user->username) == 0) {
if (user_match)
user->kick_me = TRUE;
return;
}
}
new_user.username = p_strdup(ctx->who.pool, line->username);
new_user.kick_me = user_match;
array_push_back(&k_pid->users, &new_user);
}
static bool
kick_pid_want_kicked(struct kick_context *ctx, const struct kick_pid *k_pid,
bool *show_warning)
{
unsigned int kick_count = 0;
const struct kick_user *user;
if (array_count(&k_pid->users) == 1) {
user = array_front(&k_pid->users);
if (!user->kick_me)
return FALSE;
} else {
array_foreach(&k_pid->users, user) {
if (user->kick_me)
kick_count++;
}
if (kick_count == 0)
return FALSE;
if (kick_count < array_count(&k_pid->users) &&
!ctx->force_kick) {
array_foreach(&k_pid->users, user) {
if (!user->kick_me) {
array_push_back(&ctx->kicked_users,
&user->username);
}
}
*show_warning = TRUE;
return FALSE;
}
}
return TRUE;
}
static void
kick_print_kicked(struct kick_context *ctx, const bool show_warning)
{
unsigned int i, count;
const char *const *users;
bool cli = (ctx->conn_type == DOVEADM_CONNECTION_TYPE_CLI);
if (array_count(&ctx->kicked_users) == 0) {
if (cli)
printf("no users kicked\n");
doveadm_exit_code = DOVEADM_EX_NOTFOUND;
return;
}
if (cli) {
if (show_warning) {
printf("warning: other connections would also be "
"kicked from following users:\n");
} else {
printf("kicked connections from the following users:\n");
}
}
array_sort(&ctx->kicked_users, i_strcmp_p);
users = array_get(&ctx->kicked_users, &count);
doveadm_print(users[0]);
for (i = 1; i < count; i++) {
if (strcmp(users[i-1], users[i]) != 0)
doveadm_print(users[i]);
}
doveadm_print_flush();
if (cli)
printf("\n");
if (show_warning)
printf("Use the '-f' option to enforce the disconnect.\n");
}
static void kick_users(struct kick_context *ctx)
{
bool show_enforce_warning = FALSE;
struct hash_iterate_context *iter;
void *key;
struct kick_pid *k_pid;
const struct kick_user *user;
p_array_init(&ctx->kicked_users, ctx->who.pool, 10);
iter = hash_table_iterate_init(ctx->pids);
while (hash_table_iterate(iter, ctx->pids, &key, &k_pid)) {
if (kick_pid_want_kicked(ctx, k_pid, &show_enforce_warning))
k_pid->kick = TRUE;
}
hash_table_iterate_deinit(&iter);
if (show_enforce_warning) {
kick_print_kicked(ctx, show_enforce_warning);
return;
}
iter = hash_table_iterate_init(ctx->pids);
while (hash_table_iterate(iter, ctx->pids, &key, &k_pid)) {
if (!k_pid->kick)
continue;
if (kill(k_pid->pid, SIGTERM) < 0 && errno != ESRCH) {
fprintf(stderr, "kill(%s, SIGTERM) failed: %m\n",
dec2str(k_pid->pid));
} else {
array_foreach(&k_pid->users, user) {
array_push_back(&ctx->kicked_users,
&user->username);
}
}
}
hash_table_iterate_deinit(&iter);
kick_print_kicked(ctx, show_enforce_warning);
}
static void cmd_kick(struct doveadm_cmd_context *cctx)
{
const char *const *masks;
struct kick_context ctx;
i_zero(&ctx);
if (!doveadm_cmd_param_str(cctx, "socket-path", &(ctx.who.anvil_path)))
ctx.who.anvil_path = t_strconcat(doveadm_settings->base_dir, "/anvil", NULL);
(void)doveadm_cmd_param_bool(cctx, "force", &(ctx.force_kick));
if (!doveadm_cmd_param_array(cctx, "mask", &masks)) {
doveadm_exit_code = EX_USAGE;
i_error("user and/or ip[/bits] must be specified.");
return;
}
ctx.conn_type = cctx->conn_type;
if (ctx.conn_type != DOVEADM_CONNECTION_TYPE_CLI) {
/* force-kick is a pretty ugly option. its output can't be
nicely translated to an API reply. it also wouldn't be very
useful in scripts, only for preventing a new admin from
accidentally kicking too many users. it's also useful only
in a non-recommended setup where processes are handling
multiple connections. so for now we'll preserve the option
for CLI, but always do a force-kick with non-CLI. */
ctx.force_kick = TRUE;
}
ctx.who.pool = pool_alloconly_create("kick pids", 10240);
hash_table_create_direct(&ctx.pids, ctx.who.pool, 0);
if (who_parse_args(&ctx.who, masks)!=0) {
hash_table_destroy(&ctx.pids);
pool_unref(&ctx.who.pool);
return;
}
doveadm_print_init(DOVEADM_PRINT_TYPE_FORMATTED);
doveadm_print_formatted_set_format("%{result} ");
doveadm_print_header_simple("result");
who_lookup(&ctx.who, kick_aggregate_line);
kick_users(&ctx);
hash_table_destroy(&ctx.pids);
pool_unref(&ctx.who.pool);
}
struct doveadm_cmd_ver2 doveadm_cmd_kick_ver2 = {
.name = "kick",
.cmd = cmd_kick,
.usage = "[-a <anvil socket path>] <user mask>[|]<ip/bits>",
DOVEADM_CMD_PARAMS_START
DOVEADM_CMD_PARAM('a',"socket-path",CMD_PARAM_STR,0)
DOVEADM_CMD_PARAM('f',"force",CMD_PARAM_BOOL,0)
DOVEADM_CMD_PARAM('\0',"mask",CMD_PARAM_ARRAY,CMD_PARAM_FLAG_POSITIONAL)
DOVEADM_CMD_PARAMS_END
};
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