mirror of
https://github.com/matrix-construct/construct
synced 2024-11-10 20:11:07 +01:00
wsockd: add skeleton for future websockets helper (ref #78)
This commit is contained in:
William Pitcock
parent
122ae255d7
commit
caebeeca95
5 changed files with 442 additions and 0 deletions
1
.gitignore
vendored
1
.gitignore
vendored
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@ -53,6 +53,7 @@ ircd/ircd_lexer.c
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ircd/version.c
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ircd/version.c.last
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ssld/ssld
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wsockd/wsockd
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tools/charybdis-mkpasswd
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tools/genssl
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tools/mkpasswd
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@ -9,6 +9,7 @@ endif
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SUBDIRS += ircd \
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ssld \
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wsockd \
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authd \
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bandb \
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tools \
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@ -656,6 +656,7 @@ AC_CONFIG_FILES( \
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authd/Makefile \
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bandb/Makefile \
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ssld/Makefile \
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wsockd/Makefile \
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extensions/Makefile \
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ircd/Makefile \
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modules/Makefile \
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7
wsockd/Makefile.am
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7
wsockd/Makefile.am
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@ -0,0 +1,7 @@
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pkglibexec_PROGRAMS = wsockd
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AM_CFLAGS=$(WARNFLAGS)
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AM_CPPFLAGS = -I../include -I../librb/include
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wsockd_SOURCES = wsockd.c
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wsockd_LDADD = ../librb/src/librb.la
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432
wsockd/wsockd.c
Normal file
432
wsockd/wsockd.c
Normal file
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@ -0,0 +1,432 @@
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/*
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* wsockd.c: charybdis websockets helper
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* Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org>
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* Copyright (C) 2007 ircd-ratbox development team
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* Copyright (C) 2016 William Pitcock <nenolod@dereferenced.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*/
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#include "stdinc.h"
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#define MAXPASSFD 4
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#ifndef READBUF_SIZE
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#define READBUF_SIZE 16384
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#endif
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static void setup_signals(void);
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static pid_t ppid;
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static inline uint32_t
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buf_to_uint32(uint8_t *buf)
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{
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uint32_t x;
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memcpy(&x, buf, sizeof(x));
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return x;
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}
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static inline void
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uint32_to_buf(uint8_t *buf, uint32_t x)
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{
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memcpy(buf, &x, sizeof(x));
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return;
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}
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typedef struct _mod_ctl_buf
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{
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rb_dlink_node node;
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uint8_t *buf;
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size_t buflen;
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rb_fde_t *F[MAXPASSFD];
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int nfds;
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} mod_ctl_buf_t;
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typedef struct _mod_ctl
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{
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rb_dlink_node node;
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int cli_count;
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rb_fde_t *F;
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rb_fde_t *F_pipe;
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rb_dlink_list readq;
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rb_dlink_list writeq;
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} mod_ctl_t;
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static mod_ctl_t *mod_ctl;
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typedef struct _conn
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{
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rb_dlink_node node;
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mod_ctl_t *ctl;
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rawbuf_head_t *modbuf_out;
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rawbuf_head_t *plainbuf_out;
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uint32_t id;
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rb_fde_t *mod_fd;
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rb_fde_t *plain_fd;
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uint64_t mod_out;
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uint64_t mod_in;
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uint64_t plain_in;
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uint64_t plain_out;
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uint8_t flags;
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void *stream;
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} conn_t;
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#define FLAG_CORK 0x01
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#define FLAG_DEAD 0x02
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#define FLAG_WSOCK 0x04
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#define IsCork(x) ((x)->flags & FLAG_CORK)
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#define IsDead(x) ((x)->flags & FLAG_DEAD)
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#define IsWS(x) ((x)->flags & FLAG_WSOCK)
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#define SetCork(x) ((x)->flags |= FLAG_CORK)
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#define SetDead(x) ((x)->flags |= FLAG_DEAD)
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#define SetWS(x) ((x)->flags |= FLAG_WSOCK)
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#define ClearCork(x) ((x)->flags &= ~FLAG_CORK)
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#define ClearDead(x) ((x)->flags &= ~FLAG_DEAD)
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#define ClearWS(x) ((x)->flags &= ~FLAG_WSOCK)
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#define NO_WAIT 0x0
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#define WAIT_PLAIN 0x1
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#define HASH_WALK_SAFE(i, max, ptr, next, table) for(i = 0; i < max; i++) { RB_DLINK_FOREACH_SAFE(ptr, next, table[i].head)
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#define HASH_WALK_END }
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#define CONN_HASH_SIZE 2000
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#define connid_hash(x) (&connid_hash_table[(x % CONN_HASH_SIZE)])
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static rb_dlink_list connid_hash_table[CONN_HASH_SIZE];
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static rb_dlink_list dead_list;
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#ifndef _WIN32
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static void
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dummy_handler(int sig)
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{
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return;
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}
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#endif
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static void
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setup_signals()
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{
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#ifndef _WIN32
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struct sigaction act;
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act.sa_flags = 0;
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act.sa_handler = SIG_IGN;
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sigemptyset(&act.sa_mask);
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sigaddset(&act.sa_mask, SIGPIPE);
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sigaddset(&act.sa_mask, SIGALRM);
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#ifdef SIGTRAP
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sigaddset(&act.sa_mask, SIGTRAP);
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#endif
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#ifdef SIGWINCH
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sigaddset(&act.sa_mask, SIGWINCH);
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sigaction(SIGWINCH, &act, 0);
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#endif
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sigaction(SIGPIPE, &act, 0);
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#ifdef SIGTRAP
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sigaction(SIGTRAP, &act, 0);
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#endif
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act.sa_handler = dummy_handler;
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sigaction(SIGALRM, &act, 0);
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#endif
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}
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static int
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maxconn(void)
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{
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#if defined(RLIMIT_NOFILE) && defined(HAVE_SYS_RESOURCE_H)
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struct rlimit limit;
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if(!getrlimit(RLIMIT_NOFILE, &limit))
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{
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return limit.rlim_cur;
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}
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#endif /* RLIMIT_FD_MAX */
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return MAXCONNECTIONS;
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}
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static conn_t *
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conn_find_by_id(uint32_t id)
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{
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rb_dlink_node *ptr;
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conn_t *conn;
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RB_DLINK_FOREACH(ptr, (connid_hash(id))->head)
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{
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conn = ptr->data;
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if(conn->id == id && !IsDead(conn))
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return conn;
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}
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return NULL;
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}
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static void
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conn_add_id_hash(conn_t * conn, uint32_t id)
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{
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conn->id = id;
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rb_dlinkAdd(conn, &conn->node, connid_hash(id));
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}
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static void
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free_conn(conn_t * conn)
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{
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rb_free_rawbuffer(conn->modbuf_out);
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rb_free_rawbuffer(conn->plainbuf_out);
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rb_free(conn);
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}
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static void
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clean_dead_conns(void *unused)
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{
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conn_t *conn;
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rb_dlink_node *ptr, *next;
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RB_DLINK_FOREACH_SAFE(ptr, next, dead_list.head)
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{
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conn = ptr->data;
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free_conn(conn);
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}
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dead_list.tail = dead_list.head = NULL;
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}
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static conn_t *
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make_conn(mod_ctl_t * ctl, rb_fde_t *mod_fd, rb_fde_t *plain_fd)
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{
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conn_t *conn = rb_malloc(sizeof(conn_t));
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conn->ctl = ctl;
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conn->modbuf_out = rb_new_rawbuffer();
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conn->plainbuf_out = rb_new_rawbuffer();
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conn->mod_fd = mod_fd;
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conn->plain_fd = plain_fd;
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conn->id = -1;
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conn->stream = NULL;
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rb_set_nb(mod_fd);
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rb_set_nb(plain_fd);
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return conn;
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}
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static void
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cleanup_bad_message(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb)
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{
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int i;
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/* XXX should log this somehow */
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for (i = 0; i < ctlb->nfds; i++)
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rb_close(ctlb->F[i]);
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}
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static void
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wsock_process_accept(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb)
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{
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conn_t *conn;
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uint32_t id;
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conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]);
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id = buf_to_uint32(&ctlb->buf[1]);
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conn_add_id_hash(conn, id);
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SetWS(conn);
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if(rb_get_type(conn->mod_fd) & RB_FD_UNKNOWN)
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rb_set_type(conn->mod_fd, RB_FD_SOCKET);
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if(rb_get_type(conn->plain_fd) == RB_FD_UNKNOWN)
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rb_set_type(conn->plain_fd, RB_FD_SOCKET);
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// XXX todo
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}
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static void
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mod_process_cmd_recv(mod_ctl_t * ctl)
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{
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rb_dlink_node *ptr, *next;
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mod_ctl_buf_t *ctl_buf;
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RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head)
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{
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ctl_buf = ptr->data;
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switch (*ctl_buf->buf)
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{
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case 'A':
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{
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if (ctl_buf->nfds != 2 || ctl_buf->buflen != 5)
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{
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cleanup_bad_message(ctl, ctl_buf);
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break;
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}
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wsock_process_accept(ctl, ctl_buf);
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break;
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}
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default:
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break;
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/* Log unknown commands */
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}
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rb_dlinkDelete(ptr, &ctl->readq);
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rb_free(ctl_buf->buf);
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rb_free(ctl_buf);
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}
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}
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static void
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mod_read_ctl(rb_fde_t *F, void *data)
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{
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mod_ctl_buf_t *ctl_buf;
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mod_ctl_t *ctl = data;
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int retlen;
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int i;
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do
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{
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ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t));
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ctl_buf->buf = rb_malloc(READBUF_SIZE);
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ctl_buf->buflen = READBUF_SIZE;
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retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, ctl_buf->buflen, ctl_buf->F,
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MAXPASSFD);
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if(retlen <= 0)
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{
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rb_free(ctl_buf->buf);
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rb_free(ctl_buf);
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}
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else
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{
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ctl_buf->buflen = retlen;
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rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq);
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for (i = 0; i < MAXPASSFD && ctl_buf->F[i] != NULL; i++)
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;
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ctl_buf->nfds = i;
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}
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}
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while(retlen > 0);
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if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
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exit(0);
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mod_process_cmd_recv(ctl);
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rb_setselect(ctl->F, RB_SELECT_READ, mod_read_ctl, ctl);
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}
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static void
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mod_write_ctl(rb_fde_t *F, void *data)
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{
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mod_ctl_t *ctl = data;
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mod_ctl_buf_t *ctl_buf;
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rb_dlink_node *ptr, *next;
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int retlen, x;
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RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head)
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{
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ctl_buf = ptr->data;
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retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf,
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ctl_buf->buflen, ppid);
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if(retlen > 0)
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{
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rb_dlinkDelete(ptr, &ctl->writeq);
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for(x = 0; x < ctl_buf->nfds; x++)
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rb_close(ctl_buf->F[x]);
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rb_free(ctl_buf->buf);
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rb_free(ctl_buf);
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}
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if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
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exit(0);
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}
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if(rb_dlink_list_length(&ctl->writeq) > 0)
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rb_setselect(ctl->F, RB_SELECT_WRITE, mod_write_ctl, ctl);
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}
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static void
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read_pipe_ctl(rb_fde_t *F, void *data)
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{
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char inbuf[READBUF_SIZE];
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int retlen;
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while((retlen = rb_read(F, inbuf, sizeof(inbuf))) > 0)
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{
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;; /* we don't do anything with the pipe really, just care if the other process dies.. */
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}
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if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
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exit(0);
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rb_setselect(F, RB_SELECT_READ, read_pipe_ctl, NULL);
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}
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int
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main(int argc, char **argv)
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{
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const char *s_ctlfd, *s_pipe, *s_pid;
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int ctlfd, pipefd, x, maxfd;
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maxfd = maxconn();
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s_ctlfd = getenv("CTL_FD");
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s_pipe = getenv("CTL_PIPE");
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s_pid = getenv("CTL_PPID");
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if(s_ctlfd == NULL || s_pipe == NULL || s_pid == NULL)
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{
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fprintf(stderr,
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"This is the charybdis wsockd for internal ircd use.\n");
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fprintf(stderr,
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"You aren't supposed to run me directly. Exiting.\n");
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exit(1);
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}
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ctlfd = atoi(s_ctlfd);
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pipefd = atoi(s_pipe);
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ppid = atoi(s_pid);
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x = 0;
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#ifndef _WIN32
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for(x = 0; x < maxfd; x++)
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{
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if(x != ctlfd && x != pipefd && x > 2)
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close(x);
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}
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x = open("/dev/null", O_RDWR);
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if(x >= 0)
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{
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if(ctlfd != 0 && pipefd != 0)
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dup2(x, 0);
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if(ctlfd != 1 && pipefd != 1)
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dup2(x, 1);
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if(ctlfd != 2 && pipefd != 2)
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dup2(x, 2);
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if(x > 2)
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close(x);
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}
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#endif
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setup_signals();
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rb_lib_init(NULL, NULL, NULL, 0, maxfd, 1024, 4096);
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rb_init_rawbuffers(1024);
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mod_ctl = rb_malloc(sizeof(mod_ctl_t));
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mod_ctl->F = rb_open(ctlfd, RB_FD_SOCKET, "ircd control socket");
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mod_ctl->F_pipe = rb_open(pipefd, RB_FD_PIPE, "ircd pipe");
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rb_set_nb(mod_ctl->F);
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rb_set_nb(mod_ctl->F_pipe);
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rb_event_addish("clean_dead_conns", clean_dead_conns, NULL, 10);
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read_pipe_ctl(mod_ctl->F_pipe, NULL);
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mod_read_ctl(mod_ctl->F, mod_ctl);
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rb_lib_loop(0);
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return 0;
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}
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