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solanum-vs-hackint-and-char.../wsockd/wsockd.c

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/*
* wsockd.c: charybdis websockets helper
* Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org>
* Copyright (C) 2007 ircd-ratbox development team
* Copyright (C) 2016 William Pitcock <nenolod@dereferenced.org>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include "stdinc.h"
#define MAXPASSFD 4
#ifndef READBUF_SIZE
#define READBUF_SIZE 16384
#endif
static void setup_signals(void);
static pid_t ppid;
static inline uint32_t
buf_to_uint32(uint8_t *buf)
{
uint32_t x;
memcpy(&x, buf, sizeof(x));
return x;
}
static inline void
uint32_to_buf(uint8_t *buf, uint32_t x)
{
memcpy(buf, &x, sizeof(x));
return;
}
typedef struct _mod_ctl_buf
{
rb_dlink_node node;
uint8_t *buf;
size_t buflen;
rb_fde_t *F[MAXPASSFD];
int nfds;
} mod_ctl_buf_t;
typedef struct _mod_ctl
{
rb_dlink_node node;
int cli_count;
rb_fde_t *F;
rb_fde_t *F_pipe;
rb_dlink_list readq;
rb_dlink_list writeq;
} mod_ctl_t;
static mod_ctl_t *mod_ctl;
typedef struct _conn
{
rb_dlink_node node;
mod_ctl_t *ctl;
rawbuf_head_t *modbuf_out;
rawbuf_head_t *plainbuf_out;
uint32_t id;
rb_fde_t *mod_fd;
rb_fde_t *plain_fd;
uint64_t mod_out;
uint64_t mod_in;
uint64_t plain_in;
uint64_t plain_out;
uint8_t flags;
void *stream;
} conn_t;
#define FLAG_CORK 0x01
#define FLAG_DEAD 0x02
#define FLAG_WSOCK 0x04
#define IsCork(x) ((x)->flags & FLAG_CORK)
#define IsDead(x) ((x)->flags & FLAG_DEAD)
#define IsWS(x) ((x)->flags & FLAG_WSOCK)
#define SetCork(x) ((x)->flags |= FLAG_CORK)
#define SetDead(x) ((x)->flags |= FLAG_DEAD)
#define SetWS(x) ((x)->flags |= FLAG_WSOCK)
#define ClearCork(x) ((x)->flags &= ~FLAG_CORK)
#define ClearDead(x) ((x)->flags &= ~FLAG_DEAD)
#define ClearWS(x) ((x)->flags &= ~FLAG_WSOCK)
#define NO_WAIT 0x0
#define WAIT_PLAIN 0x1
#define HASH_WALK_SAFE(i, max, ptr, next, table) for(i = 0; i < max; i++) { RB_DLINK_FOREACH_SAFE(ptr, next, table[i].head)
#define HASH_WALK_END }
#define CONN_HASH_SIZE 2000
#define connid_hash(x) (&connid_hash_table[(x % CONN_HASH_SIZE)])
static rb_dlink_list connid_hash_table[CONN_HASH_SIZE];
static rb_dlink_list dead_list;
#ifndef _WIN32
static void
dummy_handler(int sig)
{
return;
}
#endif
static void
setup_signals()
{
#ifndef _WIN32
struct sigaction act;
act.sa_flags = 0;
act.sa_handler = SIG_IGN;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGPIPE);
sigaddset(&act.sa_mask, SIGALRM);
#ifdef SIGTRAP
sigaddset(&act.sa_mask, SIGTRAP);
#endif
#ifdef SIGWINCH
sigaddset(&act.sa_mask, SIGWINCH);
sigaction(SIGWINCH, &act, 0);
#endif
sigaction(SIGPIPE, &act, 0);
#ifdef SIGTRAP
sigaction(SIGTRAP, &act, 0);
#endif
act.sa_handler = dummy_handler;
sigaction(SIGALRM, &act, 0);
#endif
}
static int
maxconn(void)
{
#if defined(RLIMIT_NOFILE) && defined(HAVE_SYS_RESOURCE_H)
struct rlimit limit;
if(!getrlimit(RLIMIT_NOFILE, &limit))
{
return limit.rlim_cur;
}
#endif /* RLIMIT_FD_MAX */
return MAXCONNECTIONS;
}
static conn_t *
conn_find_by_id(uint32_t id)
{
rb_dlink_node *ptr;
conn_t *conn;
RB_DLINK_FOREACH(ptr, (connid_hash(id))->head)
{
conn = ptr->data;
if(conn->id == id && !IsDead(conn))
return conn;
}
return NULL;
}
static void
conn_add_id_hash(conn_t * conn, uint32_t id)
{
conn->id = id;
rb_dlinkAdd(conn, &conn->node, connid_hash(id));
}
static void
free_conn(conn_t * conn)
{
rb_free_rawbuffer(conn->modbuf_out);
rb_free_rawbuffer(conn->plainbuf_out);
rb_free(conn);
}
static void
clean_dead_conns(void *unused)
{
conn_t *conn;
rb_dlink_node *ptr, *next;
RB_DLINK_FOREACH_SAFE(ptr, next, dead_list.head)
{
conn = ptr->data;
free_conn(conn);
}
dead_list.tail = dead_list.head = NULL;
}
static conn_t *
make_conn(mod_ctl_t * ctl, rb_fde_t *mod_fd, rb_fde_t *plain_fd)
{
conn_t *conn = rb_malloc(sizeof(conn_t));
conn->ctl = ctl;
conn->modbuf_out = rb_new_rawbuffer();
conn->plainbuf_out = rb_new_rawbuffer();
conn->mod_fd = mod_fd;
conn->plain_fd = plain_fd;
conn->id = -1;
conn->stream = NULL;
rb_set_nb(mod_fd);
rb_set_nb(plain_fd);
return conn;
}
static void
cleanup_bad_message(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb)
{
int i;
/* XXX should log this somehow */
for (i = 0; i < ctlb->nfds; i++)
rb_close(ctlb->F[i]);
}
static void
wsock_process_accept(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb)
{
conn_t *conn;
uint32_t id;
conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]);
id = buf_to_uint32(&ctlb->buf[1]);
conn_add_id_hash(conn, id);
SetWS(conn);
if(rb_get_type(conn->mod_fd) & RB_FD_UNKNOWN)
rb_set_type(conn->mod_fd, RB_FD_SOCKET);
if(rb_get_type(conn->plain_fd) == RB_FD_UNKNOWN)
rb_set_type(conn->plain_fd, RB_FD_SOCKET);
// XXX todo
}
static void
mod_process_cmd_recv(mod_ctl_t * ctl)
{
rb_dlink_node *ptr, *next;
mod_ctl_buf_t *ctl_buf;
RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head)
{
ctl_buf = ptr->data;
switch (*ctl_buf->buf)
{
case 'A':
{
if (ctl_buf->nfds != 2 || ctl_buf->buflen != 5)
{
cleanup_bad_message(ctl, ctl_buf);
break;
}
wsock_process_accept(ctl, ctl_buf);
break;
}
default:
break;
/* Log unknown commands */
}
rb_dlinkDelete(ptr, &ctl->readq);
rb_free(ctl_buf->buf);
rb_free(ctl_buf);
}
}
static void
mod_read_ctl(rb_fde_t *F, void *data)
{
mod_ctl_buf_t *ctl_buf;
mod_ctl_t *ctl = data;
int retlen;
int i;
do
{
ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t));
ctl_buf->buf = rb_malloc(READBUF_SIZE);
ctl_buf->buflen = READBUF_SIZE;
retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, ctl_buf->buflen, ctl_buf->F,
MAXPASSFD);
if(retlen <= 0)
{
rb_free(ctl_buf->buf);
rb_free(ctl_buf);
}
else
{
ctl_buf->buflen = retlen;
rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq);
for (i = 0; i < MAXPASSFD && ctl_buf->F[i] != NULL; i++)
;
ctl_buf->nfds = i;
}
}
while(retlen > 0);
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
exit(0);
mod_process_cmd_recv(ctl);
rb_setselect(ctl->F, RB_SELECT_READ, mod_read_ctl, ctl);
}
static void
mod_write_ctl(rb_fde_t *F, void *data)
{
mod_ctl_t *ctl = data;
mod_ctl_buf_t *ctl_buf;
rb_dlink_node *ptr, *next;
int retlen, x;
RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head)
{
ctl_buf = ptr->data;
retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf,
ctl_buf->buflen, ppid);
if(retlen > 0)
{
rb_dlinkDelete(ptr, &ctl->writeq);
for(x = 0; x < ctl_buf->nfds; x++)
rb_close(ctl_buf->F[x]);
rb_free(ctl_buf->buf);
rb_free(ctl_buf);
}
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
exit(0);
}
if(rb_dlink_list_length(&ctl->writeq) > 0)
rb_setselect(ctl->F, RB_SELECT_WRITE, mod_write_ctl, ctl);
}
static void
read_pipe_ctl(rb_fde_t *F, void *data)
{
char inbuf[READBUF_SIZE];
int retlen;
while((retlen = rb_read(F, inbuf, sizeof(inbuf))) > 0)
{
;; /* we don't do anything with the pipe really, just care if the other process dies.. */
}
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
exit(0);
rb_setselect(F, RB_SELECT_READ, read_pipe_ctl, NULL);
}
int
main(int argc, char **argv)
{
const char *s_ctlfd, *s_pipe, *s_pid;
int ctlfd, pipefd, x, maxfd;
maxfd = maxconn();
s_ctlfd = getenv("CTL_FD");
s_pipe = getenv("CTL_PIPE");
s_pid = getenv("CTL_PPID");
if(s_ctlfd == NULL || s_pipe == NULL || s_pid == NULL)
{
fprintf(stderr,
"This is the charybdis wsockd for internal ircd use.\n");
fprintf(stderr,
"You aren't supposed to run me directly. Exiting.\n");
exit(1);
}
ctlfd = atoi(s_ctlfd);
pipefd = atoi(s_pipe);
ppid = atoi(s_pid);
x = 0;
#ifndef _WIN32
for(x = 0; x < maxfd; x++)
{
if(x != ctlfd && x != pipefd && x > 2)
close(x);
}
x = open("/dev/null", O_RDWR);
if(x >= 0)
{
if(ctlfd != 0 && pipefd != 0)
dup2(x, 0);
if(ctlfd != 1 && pipefd != 1)
dup2(x, 1);
if(ctlfd != 2 && pipefd != 2)
dup2(x, 2);
if(x > 2)
close(x);
}
#endif
setup_signals();
rb_lib_init(NULL, NULL, NULL, 0, maxfd, 1024, 4096);
rb_init_rawbuffers(1024);
mod_ctl = rb_malloc(sizeof(mod_ctl_t));
mod_ctl->F = rb_open(ctlfd, RB_FD_SOCKET, "ircd control socket");
mod_ctl->F_pipe = rb_open(pipefd, RB_FD_PIPE, "ircd pipe");
rb_set_nb(mod_ctl->F);
rb_set_nb(mod_ctl->F_pipe);
rb_event_addish("clean_dead_conns", clean_dead_conns, NULL, 10);
read_pipe_ctl(mod_ctl->F_pipe, NULL);
mod_read_ctl(mod_ctl->F, mod_ctl);
rb_lib_loop(0);
return 0;
}
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