control.c
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/*
clsync - file tree sync utility based on fanotify and inotify
Copyright (C) 2013 Dmitry Yu Okunev <dyokunev@ut.mephi.ru> 0x8E30679C
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
#include <sys/un.h> // for "struct sockaddr_un"
#include <sys/stat.h> // mkdir()
#include <sys/types.h> // mkdir()
#include <fcntl.h> // mkdirat()
#include <glib.h> // g_hash_table_foreach()
#include "indexes.h"
#include "ctx.h"
#include "error.h"
#include "sync.h"
#include "control.h"
#include "socket.h"
static pthread_t pthread_control;
static inline int control_error(clsyncsock_t *clsyncsock_p, const char *const funct, const char *const args) {
return socket_send(clsyncsock_p, SOCKCMD_REPLY_ECUSTOM, funct, args, errno, strerror(errno));
}
enum dump_dirfd_obj {
DUMP_DIRFD_ROOT = 0,
DUMP_DIRFD_QUEUE,
DUMP_DIRFD_THREAD,
DUMP_DIRFD_MAX
};
enum dump_ltype {
DUMP_LTYPE_INCLUDE,
DUMP_LTYPE_EXCLUDE,
DUMP_LTYPE_EVINFO,
};
struct control_dump_arg {
clsyncsock_t *clsyncsock_p;
ctx_t *ctx_p;
int dirfd[DUMP_DIRFD_MAX];
int fd_out;
int data;
};
void control_dump_liststep(gpointer fpath_gp, gpointer evinfo_gp, gpointer arg_gp) {
char *fpath = (char *)fpath_gp;
eventinfo_t *evinfo = (eventinfo_t *)evinfo_gp;
struct control_dump_arg *arg = arg_gp;
char act, num;
switch (arg->data) {
case DUMP_LTYPE_INCLUDE:
act = '+';
num = '1';
break;
case DUMP_LTYPE_EXCLUDE:
act = '-';
num = '1';
break;
case DUMP_LTYPE_EVINFO:
act = '+';
num = evinfo->flags&EVIF_RECURSIVELY ? '*' :
(evinfo->flags&EVIF_CONTENTRECURSIVELY ? '/' : '1');
break;
default:
act = '?';
num = '?';
}
dprintf(arg->fd_out, "%c%c %s\n", act, num, fpath);
return;
}
int control_dump_thread(threadinfo_t *threadinfo_p, void *_arg) {
struct control_dump_arg *arg = _arg;
char buf[BUFSIZ];
snprintf(buf, BUFSIZ, "%u-%u-%lx", threadinfo_p->iteration, threadinfo_p->thread_num, (long)threadinfo_p->pthread);
arg->fd_out = openat(arg->dirfd[DUMP_DIRFD_THREAD], buf, O_WRONLY);
if (arg->fd_out == -1)
return errno;
{
char **argv;
dprintf(arg->fd_out,
"thread:\n\titeration == %u;\n\tnum == %u;\n\tpthread == %lx;\n\tstarttime == %lu\n\texpiretime == %lu\n\tchild_pid == %u\n\ttry_n == %u\nCommand:",
threadinfo_p->iteration,
threadinfo_p->thread_num,
(long)threadinfo_p->pthread,
threadinfo_p->starttime,
threadinfo_p->expiretime,
threadinfo_p->child_pid,
threadinfo_p->try_n
);
argv = threadinfo_p->argv;
while (argv != NULL)
dprintf(arg->fd_out, " \"%s\"", *(argv++));
dprintf(arg->fd_out, "\n");
}
arg->data = DUMP_LTYPE_EVINFO;
g_hash_table_foreach(threadinfo_p->fpath2ei_ht, control_dump_liststep, arg);
close(arg->fd_out);
return 0;
}
int control_mkdir_open(clsyncsock_t *clsyncsock_p, const char *const dir_path) {
int dirfd;
if (mkdir(dir_path, DUMP_DIRMODE)) {
control_error(clsyncsock_p, "mkdir", dir_path);
return -1;
}
dirfd = open(dir_path, O_RDWR);
if (dirfd == -1) {
control_error(clsyncsock_p, "open", dir_path);
return -1;
}
return dirfd;
}
int control_dump(ctx_t *ctx_p, clsyncsock_t *clsyncsock_p, sockcmd_t *sockcmd_p) {
indexes_t *indexes_p = ctx_p->indexes_p;
sockcmd_dat_dump_t *dat = sockcmd_p->data;
int rootfd;
struct control_dump_arg arg;
enum dump_dirfd_obj dirfd_obj;
static const char *const subdirs[] = {
[DUMP_DIRFD_QUEUE] = "queue",
[DUMP_DIRFD_THREAD] = "threads"
};
rootfd = control_mkdir_open(clsyncsock_p, dat->dir_path);
if (rootfd == -1)
goto l_control_dump_end;
arg.dirfd[DUMP_DIRFD_ROOT] = rootfd;
dirfd_obj = DUMP_DIRFD_ROOT+1;
while (dirfd_obj < DUMP_DIRFD_MAX) {
const char *const subdir = subdirs[dirfd_obj];
arg.dirfd[dirfd_obj] = control_mkdir_open(clsyncsock_p, subdir);
if (arg.dirfd[dirfd_obj] == -1)
goto l_control_dump_end;
dirfd_obj++;
}
arg.clsyncsock_p = clsyncsock_p;
arg.ctx_p = ctx_p;
int queue_id = 0;
while (queue_id < QUEUE_MAX) {
char buf[BUFSIZ];
snprintf(buf, BUFSIZ, "%u", queue_id);
arg.fd_out = openat(arg.dirfd[DUMP_DIRFD_QUEUE], buf, O_WRONLY);
arg.data = DUMP_LTYPE_EVINFO;
g_hash_table_foreach(indexes_p->fpath2ei_coll_ht[queue_id], control_dump_liststep, &arg);
arg.data = DUMP_LTYPE_EXCLUDE;
g_hash_table_foreach(indexes_p->exc_fpath_coll_ht[queue_id], control_dump_liststep, &arg);
close(arg.fd_out);
queue_id++;
}
threads_foreach(control_dump_thread, STATE_RUNNING, &arg);
l_control_dump_end:
dirfd_obj = DUMP_DIRFD_ROOT;
while (dirfd_obj < DUMP_DIRFD_MAX) {
if (arg.dirfd[dirfd_obj] != -1)
close(arg.dirfd[dirfd_obj]);
dirfd_obj++;
}
return errno ? errno : socket_send(clsyncsock_p, SOCKCMD_REPLY_DUMP);
}
int control_procclsyncsock(socket_sockthreaddata_t *arg, sockcmd_t *sockcmd_p) {
clsyncsock_t *clsyncsock_p = arg->clsyncsock_p;
ctx_t *ctx_p = (ctx_t *)arg->arg;
switch(sockcmd_p->cmd_id) {
case SOCKCMD_REQUEST_DUMP:
control_dump(ctx_p, clsyncsock_p, sockcmd_p);
break;
case SOCKCMD_REQUEST_INFO:
socket_send(clsyncsock_p, SOCKCMD_REPLY_INFO, ctx_p->config_block, ctx_p->label, ctx_p->flags, ctx_p->flags_set);
break;
case SOCKCMD_REQUEST_DIE:
sync_term(SIGTERM);
break;
default:
return EINVAL;
}
return 0;
}
static inline void closecontrol(ctx_t *ctx_p) {
if(ctx_p->socket) {
close(ctx_p->socket);
ctx_p->socket = 0;
}
}
int control_loop(ctx_t *ctx_p) {
// Starting
debug(1, "started (ctx_p->socket == %u)", ctx_p->socket);
int s;
while((s=ctx_p->socket)) {
// Check if the socket is still alive
if(socket_check_bysock(s)) {
debug(1, "Control socket closed [case 0]: %s", strerror(errno));
closecontrol(ctx_p);
continue;
}
// Waiting for event
debug(3, "waiting for events on the socket");
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(s, &rfds);
int count = select(s+1, &rfds, NULL, NULL, NULL);
// Processing the events
debug(2, "got %i events with select()", count);
// Processing the events: checks
if(count == 0) {
debug(2, "select() timed out.");
continue;
}
if(count < 0) {
debug(1, "Got negative events count. Closing the socket.");
closecontrol(ctx_p);
continue;
}
if(!FD_ISSET(s, &rfds)) {
error("Got event, but not on the control socket. Closing the socket (cannot use \"select()\").");
closecontrol(ctx_p);
continue;
}
// Processing the events: accepting new clsyncsock
clsyncsock_t *clsyncsock_p = socket_accept(s);
if(clsyncsock_p == NULL) {
if(errno == EUSERS) // Too many connections. Just ignoring the new one.
continue;
// Got unknown error. Closing control socket just in case.
error("Cannot socket_accept()");
closecontrol(ctx_p);
continue;
}
debug(2, "Starting new thread for new connection.");
socket_sockthreaddata_t *threaddata_p = socket_thread_attach(clsyncsock_p);
if (threaddata_p == NULL) {
error("Cannot create a thread for connection");
closecontrol(ctx_p);
continue;
}
threaddata_p->procfunct = control_procclsyncsock;
threaddata_p->clsyncsock_p = clsyncsock_p;
threaddata_p->arg = ctx_p;
threaddata_p->running = &ctx_p->socket;
threaddata_p->authtype = ctx_p->flags[SOCKETAUTH];
threaddata_p->flags = 0;
if (socket_thread_start(threaddata_p)) {
error("Cannot start a thread for connection");
closecontrol(ctx_p);
continue;
}
#ifdef DEBUG
// To prevent too often connections
sleep(1);
#endif
}
// Cleanup
debug(1, "control_loop() finished");
return 0;
}
int control_run(ctx_t *ctx_p) {
if(ctx_p->socketpath != NULL) {
int ret = 0;
int s = -1;
// initializing clsync-socket subsystem
if ((ret = socket_init()))
error("Cannot init clsync-sockets subsystem.");
if (!ret) {
clsyncsock_t *clsyncsock = socket_listen_unix(ctx_p->socketpath);
if (clsyncsock == NULL) {
ret = errno;
} else {
s = clsyncsock->sock;
socket_cleanup(clsyncsock);
}
}
// fixing privileges
if (!ret) {
if(ctx_p->flags[SOCKETMOD])
if(chmod(ctx_p->socketpath, ctx_p->socketmod)) {
error("Error, Cannot chmod(\"%s\", %o)",
ctx_p->socketpath, ctx_p->socketmod);
ret = errno;
}
if(ctx_p->flags[SOCKETOWN])
if(chown(ctx_p->socketpath, ctx_p->socketuid, ctx_p->socketgid)) {
error("Error, Cannot chown(\"%s\", %u, %u)",
ctx_p->socketpath, ctx_p->socketuid, ctx_p->socketgid);
ret = errno;
}
}
// finish
if (ret) {
close(s);
return ret;
}
ctx_p->socket = s;
debug(2, "ctx_p->socket = %u", ctx_p->socket);
ret = pthread_create(&pthread_control, NULL, (void *(*)(void *))control_loop, ctx_p);
}
return 0;
}
int control_cleanup(ctx_t *ctx_p) {
if(ctx_p->socketpath != NULL) {
unlink(ctx_p->socketpath);
closecontrol(ctx_p);
// TODO: kill pthread_control and join
// pthread_join(pthread_control, NULL);
socket_deinit();
}
return 0;
}