elemental-ircd/ssld/ssld.c

1158 lines
25 KiB
C

/*
* ssld.c: The ircd-ratbox ssl/zlib helper daemon thingy
* Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org>
* Copyright (C) 2007 ircd-ratbox development team
*
* 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
*
* $Id: ssld.c 25677 2008-07-06 04:21:42Z androsyn $
*/
#include "stdinc.h"
#ifdef HAVE_LIBZ
#include <zlib.h>
#endif
#define MAXPASSFD 4
#ifndef READBUF_SIZE
#define READBUF_SIZE 16384
#endif
static void setup_signals(void);
static inline int32_t buf_to_int32(char *buf)
{
int32_t x;
memcpy(&x, buf, sizeof(x));
return x;
}
static inline void int32_to_buf(char *buf, int32_t x)
{
memcpy(buf, &x, sizeof(x));
return;
}
static inline uint16_t buf_to_uint16(char *buf)
{
uint16_t x;
memcpy(&x, buf, sizeof(x));
return x;
}
static inline void uint16_to_buf(char *buf, uint16_t x)
{
memcpy(buf, &x, sizeof(x));
return;
}
static char inbuf[READBUF_SIZE];
#ifdef HAVE_LIBZ
static char outbuf[READBUF_SIZE];
#endif
typedef struct _mod_ctl_buf
{
rb_dlink_node node;
char *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;
#ifdef HAVE_LIBZ
typedef struct _zlib_stream
{
z_stream instream;
z_stream outstream;
} zlib_stream_t;
#endif
typedef struct _conn
{
rb_dlink_node node;
mod_ctl_t *ctl;
rawbuf_head_t *modbuf_out;
rawbuf_head_t *plainbuf_out;
int32_t id;
rb_fde_t *mod_fd;
rb_fde_t *plain_fd;
unsigned long long mod_out;
unsigned long long mod_in;
unsigned long long plain_in;
unsigned long long plain_out;
uint8_t flags;
void *stream;
} conn_t;
#define FLAG_SSL 0x01
#define FLAG_ZIP 0x02
#define FLAG_CORK 0x04
#define FLAG_DEAD 0x08
#define FLAG_SSL_W_WANTS_R 0x10 /* output needs to wait until input possible */
#define FLAG_SSL_R_WANTS_W 0x20 /* input needs to wait until output possible */
#define IsSSL(x) ((x)->flags & FLAG_SSL)
#define IsZip(x) ((x)->flags & FLAG_ZIP)
#define IsCork(x) ((x)->flags & FLAG_CORK)
#define IsDead(x) ((x)->flags & FLAG_DEAD)
#define IsSSLWWantsR(x) ((x)->flags & FLAG_SSL_W_WANTS_R)
#define IsSSLRWantsW(x) ((x)->flags & FLAG_SSL_R_WANTS_W)
#define SetSSL(x) ((x)->flags |= FLAG_SSL)
#define SetZip(x) ((x)->flags |= FLAG_ZIP)
#define SetCork(x) ((x)->flags |= FLAG_CORK)
#define SetDead(x) ((x)->flags |= FLAG_DEAD)
#define SetSSLWWantsR(x) ((x)->flags |= FLAG_SSL_W_WANTS_R)
#define SetSSLRWantsW(x) ((x)->flags |= FLAG_SSL_R_WANTS_W)
#define ClearSSL(x) ((x)->flags &= ~FLAG_SSL)
#define ClearZip(x) ((x)->flags &= ~FLAG_ZIP)
#define ClearCork(x) ((x)->flags &= ~FLAG_CORK)
#define ClearDead(x) ((x)->flags &= ~FLAG_DEAD)
#define ClearSSLWWantsR(x) ((x)->flags &= ~FLAG_SSL_W_WANTS_R)
#define ClearSSLRWantsW(x) ((x)->flags &= ~FLAG_SSL_R_WANTS_W)
#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;
static void conn_mod_read_cb(rb_fde_t * fd, void *data);
static void conn_mod_write_sendq(rb_fde_t *, void *data);
static void conn_plain_write_sendq(rb_fde_t *, void *data);
static void mod_write_ctl(rb_fde_t *, void *data);
static void conn_plain_read_cb(rb_fde_t * fd, void *data);
static void mod_cmd_write_queue(mod_ctl_t *ctl, const void *data, size_t len);
static const char *remote_closed = "Remote host closed the connection";
static int ssl_ok;
#ifdef HAVE_LIBZ
static int zlib_ok = 1;
#else
static int zlib_ok = 0;
#endif
#ifdef HAVE_LIBZ
static void *
ssld_alloc(void *unused, size_t count, size_t size)
{
return rb_malloc(count * size);
}
static void
ssld_free(void *unused, void *ptr)
{
rb_free(ptr);
}
#endif
static conn_t *
conn_find_by_id(int32_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, int32_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);
#ifdef HAVE_LIBZ
if(IsZip(conn))
{
zlib_stream_t *stream = conn->stream;
inflateEnd(&stream->instream);
deflateEnd(&stream->outstream);
}
#endif
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 void
close_conn(conn_t * conn, int wait_plain, const char *fmt, ...)
{
va_list ap;
char reason[128]; /* must always be under 250 bytes */
char buf[256];
int len;
if(IsDead(conn))
return;
rb_rawbuf_flush(conn->modbuf_out, conn->mod_fd);
rb_rawbuf_flush(conn->plainbuf_out, conn->plain_fd);
rb_close(conn->mod_fd);
SetDead(conn);
if(!wait_plain || fmt == NULL)
{
rb_close(conn->plain_fd);
if(conn->id >= 0)
rb_dlinkDelete(&conn->node, connid_hash(conn->id));
rb_dlinkAdd(conn, &conn->node, &dead_list);
return;
}
rb_setselect(conn->plain_fd, RB_SELECT_WRITE|RB_SELECT_READ, NULL, NULL);
va_start(ap, fmt);
rb_vsnprintf(reason, sizeof(reason), fmt, ap);
va_end(ap);
buf[0] = 'D';
int32_to_buf(&buf[1], conn->id);
strcpy(&buf[5], reason);
len = (strlen(reason) + 1) + 5;
mod_cmd_write_queue(conn->ctl, buf, len);
}
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
check_handshake_flood(void *unused)
{
conn_t *conn;
rb_dlink_node *ptr, *next;
unsigned int count;
int i;
HASH_WALK_SAFE(i, CONN_HASH_SIZE, ptr, next, connid_hash_table)
{
conn = ptr->data;
if(!IsSSL(conn))
continue;
count = rb_ssl_handshake_count(conn->mod_fd);
/* nothing needs to do this more than twice in ten seconds i don't think */
if(count > 2)
close_conn(conn, WAIT_PLAIN, "Handshake flooding");
else
rb_ssl_clear_handshake_count(conn->mod_fd);
}
HASH_WALK_END
}
static void
conn_mod_write_sendq(rb_fde_t * fd, void *data)
{
conn_t *conn = data;
const char *err;
int retlen;
if(IsDead(conn))
return;
if(IsSSLWWantsR(conn))
{
ClearSSLWWantsR(conn);
conn_mod_read_cb(conn->mod_fd, conn);
if(IsDead(conn))
return;
}
while ((retlen = rb_rawbuf_flush(conn->modbuf_out, fd)) > 0)
conn->mod_out += retlen;
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
{
if(retlen == 0)
close_conn(conn, WAIT_PLAIN, "%s", remote_closed);
if(IsSSL(conn) && retlen == RB_RW_SSL_ERROR)
err = rb_get_ssl_strerror(conn->mod_fd);
else
err = strerror(errno);
close_conn(conn, WAIT_PLAIN, "Write error: %s", err);
return;
}
if(rb_rawbuf_length(conn->modbuf_out) > 0)
{
if(retlen != RB_RW_SSL_NEED_READ)
rb_setselect(conn->mod_fd, RB_SELECT_WRITE, conn_mod_write_sendq, conn);
else
{
rb_setselect(conn->mod_fd, RB_SELECT_READ, conn_mod_write_sendq, conn);
rb_setselect(conn->mod_fd, RB_SELECT_WRITE, NULL, NULL);
SetSSLWWantsR(conn);
}
}
else
rb_setselect(conn->mod_fd, RB_SELECT_WRITE, NULL, NULL);
if(IsCork(conn) && rb_rawbuf_length(conn->modbuf_out) == 0)
{
ClearCork(conn);
conn_plain_read_cb(conn->plain_fd, conn);
}
}
static void
conn_mod_write(conn_t * conn, void *data, size_t len)
{
if(IsDead(conn)) /* no point in queueing to a dead man */
return;
rb_rawbuf_append(conn->modbuf_out, data, len);
}
static void
conn_plain_write(conn_t * conn, void *data, size_t len)
{
if(IsDead(conn)) /* again no point in queueing to dead men */
return;
rb_rawbuf_append(conn->plainbuf_out, data, len);
}
static void
mod_cmd_write_queue(mod_ctl_t * ctl, const void *data, size_t len)
{
mod_ctl_buf_t *ctl_buf;
ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t));
ctl_buf->buf = rb_malloc(len);
ctl_buf->buflen = len;
memcpy(ctl_buf->buf, data, len);
ctl_buf->nfds = 0;
rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq);
mod_write_ctl(ctl->F, ctl);
}
#ifdef HAVE_LIBZ
static void
common_zlib_deflate(conn_t * conn, void *buf, size_t len)
{
int ret, have;
z_stream *outstream = &((zlib_stream_t *)conn->stream)->outstream;
outstream->next_in = buf;
outstream->avail_in = len;
outstream->next_out = (Bytef *) outbuf;
outstream->avail_out = sizeof(outbuf);
ret = deflate(outstream, Z_SYNC_FLUSH);
if(ret != Z_OK)
{
/* deflate error */
close_conn(conn, WAIT_PLAIN, "Deflate failed: %s", zError(ret));
return;
}
if(outstream->avail_out == 0)
{
/* avail_out empty */
close_conn(conn, WAIT_PLAIN, "error compressing data, avail_out == 0");
return;
}
if(outstream->avail_in != 0)
{
/* avail_in isn't empty...*/
close_conn(conn, WAIT_PLAIN, "error compressing data, avail_in != 0");
return;
}
have = sizeof(outbuf) - outstream->avail_out;
conn_mod_write(conn, outbuf, have);
}
static void
common_zlib_inflate(conn_t * conn, void *buf, size_t len)
{
int ret, have;
((zlib_stream_t *)conn->stream)->instream.next_in = buf;
((zlib_stream_t *)conn->stream)->instream.avail_in = len;
((zlib_stream_t *)conn->stream)->instream.next_out = (Bytef *) outbuf;
((zlib_stream_t *)conn->stream)->instream.avail_out = sizeof(outbuf);
while (((zlib_stream_t *)conn->stream)->instream.avail_in)
{
ret = inflate(&((zlib_stream_t *)conn->stream)->instream, Z_NO_FLUSH);
if(ret != Z_OK)
{
if(!strncmp("ERROR ", buf, 6))
{
close_conn(conn, WAIT_PLAIN, "Received uncompressed ERROR");
return;
}
close_conn(conn, WAIT_PLAIN, "Inflate failed: %s", zError(ret));
return;
}
have = sizeof(outbuf) - ((zlib_stream_t *)conn->stream)->instream.avail_out;
if(((zlib_stream_t *)conn->stream)->instream.avail_in)
{
conn_plain_write(conn, outbuf, have);
have = 0;
((zlib_stream_t *)conn->stream)->instream.next_out = (Bytef *) outbuf;
((zlib_stream_t *)conn->stream)->instream.avail_out = sizeof(outbuf);
}
}
if(have == 0)
return;
conn_plain_write(conn, outbuf, have);
}
#endif
static int
plain_check_cork(conn_t * conn)
{
if(rb_rawbuf_length(conn->modbuf_out) >= 4096)
{
/* if we have over 4k pending outbound, don't read until
* we've cleared the queue */
SetCork(conn);
rb_setselect(conn->plain_fd, RB_SELECT_READ, NULL, NULL);
/* try to write */
conn_mod_write_sendq(conn->mod_fd, conn);
return 1;
}
return 0;
}
static void
conn_plain_read_cb(rb_fde_t * fd, void *data)
{
conn_t *conn = data;
int length = 0;
if(conn == NULL)
return;
if(IsDead(conn))
return;
if(plain_check_cork(conn))
return;
while (1)
{
if(IsDead(conn))
return;
length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf));
if(length == 0 || (length < 0 && !rb_ignore_errno(errno)))
{
close_conn(conn, NO_WAIT, NULL);
return;
}
if(length < 0)
{
rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_cb, conn);
conn_mod_write_sendq(conn->mod_fd, conn);
return;
}
conn->plain_in += length;
#ifdef HAVE_LIBZ
if(IsZip(conn))
common_zlib_deflate(conn, inbuf, length);
else
#endif
conn_mod_write(conn, inbuf, length);
if(IsDead(conn))
return;
if(plain_check_cork(conn))
return;
}
}
static void
conn_mod_read_cb(rb_fde_t * fd, void *data)
{
conn_t *conn = data;
const char *err = remote_closed;
int length;
if(conn == NULL)
return;
if(IsDead(conn))
return;
if(IsSSLRWantsW(conn))
{
ClearSSLRWantsW(conn);
conn_mod_write_sendq(conn->mod_fd, conn);
if(IsDead(conn))
return;
}
while (1)
{
if(IsDead(conn))
return;
length = rb_read(conn->mod_fd, inbuf, sizeof(inbuf));
if(length == 0 || (length < 0 && !rb_ignore_errno(errno)))
{
if(length == 0) {
close_conn(conn, WAIT_PLAIN, "%s", remote_closed);
return;
}
if(IsSSL(conn) && length == RB_RW_SSL_ERROR)
err = rb_get_ssl_strerror(conn->mod_fd);
else
err = strerror(errno);
close_conn(conn, WAIT_PLAIN, "Read error: %s", err);
return;
}
if(length < 0)
{
if(length != RB_RW_SSL_NEED_WRITE)
rb_setselect(conn->mod_fd, RB_SELECT_READ, conn_mod_read_cb, conn);
else
{
rb_setselect(conn->mod_fd, RB_SELECT_READ, NULL, NULL);
rb_setselect(conn->mod_fd, RB_SELECT_WRITE, conn_mod_read_cb, conn);
SetSSLRWantsW(conn);
}
conn_plain_write_sendq(conn->plain_fd, conn);
return;
}
conn->mod_in += length;
#ifdef HAVE_LIBZ
if(IsZip(conn))
common_zlib_inflate(conn, inbuf, length);
else
#endif
conn_plain_write(conn, inbuf, length);
}
}
static void
conn_plain_write_sendq(rb_fde_t * fd, void *data)
{
conn_t *conn = data;
int retlen;
if(IsDead(conn))
return;
while ((retlen = rb_rawbuf_flush(conn->plainbuf_out, fd)) > 0)
{
conn->plain_out += retlen;
}
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
{
close_conn(data, NO_WAIT, NULL);
return;
}
if(rb_rawbuf_length(conn->plainbuf_out) > 0)
rb_setselect(conn->plain_fd, RB_SELECT_WRITE, conn_plain_write_sendq, conn);
else
rb_setselect(conn->plain_fd, RB_SELECT_WRITE, NULL, NULL);
}
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 void
ssl_process_accept_cb(rb_fde_t * F, int status, struct sockaddr *addr, rb_socklen_t len, void *data)
{
conn_t *conn = data;
if(status == RB_OK)
{
conn_mod_read_cb(conn->mod_fd, conn);
conn_plain_read_cb(conn->plain_fd, conn);
return;
}
/* ircd doesn't care about the reason for this */
close_conn(conn, NO_WAIT, 0);
return;
}
static void
ssl_process_connect_cb(rb_fde_t * F, int status, void *data)
{
conn_t *conn = data;
if(status == RB_OK)
{
conn_mod_read_cb(conn->mod_fd, conn);
conn_plain_read_cb(conn->plain_fd, conn);
}
else if(status == RB_ERR_TIMEOUT)
close_conn(conn, WAIT_PLAIN, "SSL handshake timed out");
else if(status == RB_ERROR_SSL)
close_conn(conn, WAIT_PLAIN, "%s", rb_get_ssl_strerror(conn->mod_fd));
else
close_conn(conn, WAIT_PLAIN, "SSL handshake failed");
}
static void
ssl_process_accept(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb)
{
conn_t *conn;
int32_t id;
conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]);
id = buf_to_int32(&ctlb->buf[1]);
if(id >= 0)
conn_add_id_hash(conn, id);
SetSSL(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->mod_fd) == RB_FD_UNKNOWN)
rb_set_type(conn->plain_fd, RB_FD_SOCKET);
rb_ssl_start_accepted(ctlb->F[0], ssl_process_accept_cb, conn, 10);
}
static void
ssl_process_connect(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb)
{
conn_t *conn;
int32_t id;
conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]);
id = buf_to_int32(&ctlb->buf[1]);
if(id >= 0)
conn_add_id_hash(conn, id);
SetSSL(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->mod_fd) == RB_FD_UNKNOWN)
rb_set_type(conn->plain_fd, RB_FD_SOCKET);
rb_ssl_start_connected(ctlb->F[0], ssl_process_connect_cb, conn, 10);
}
static void
process_stats(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb)
{
char outstat[512];
conn_t *conn;
const char *odata;
int32_t id;
id = buf_to_int32(&ctlb->buf[1]);
if(id < 0)
return;
odata = &ctlb->buf[5];
conn = conn_find_by_id(id);
if(conn == NULL)
return;
rb_snprintf(outstat, sizeof(outstat), "S %s %llu %llu %llu %llu", odata,
conn->plain_out, conn->mod_in, conn->plain_in, conn->mod_out);
conn->plain_out = 0;
conn->plain_in = 0;
conn->mod_in = 0;
conn->mod_out = 0;
mod_cmd_write_queue(ctl, outstat, strlen(outstat) + 1); /* +1 is so we send the \0 as well */
}
#ifdef HAVE_LIBZ
static void
zlib_send_zip_ready(mod_ctl_t *ctl, conn_t *conn)
{
char buf[5];
buf[0] = 'R';
int32_to_buf(&buf[1], conn->id);
mod_cmd_write_queue(conn->ctl, buf, sizeof(buf));
}
static void
zlib_process(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb)
{
uint8_t level;
size_t recvqlen;
size_t hdr = (sizeof(uint8_t) * 2) + sizeof(int32_t);
void *recvq_start;
z_stream *instream, *outstream;
conn_t *conn;
int32_t id;
conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]);
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);
id = buf_to_int32(&ctlb->buf[1]);
conn_add_id_hash(conn, id);
level = (uint8_t) ctlb->buf[5];
recvqlen = ctlb->buflen - hdr;
recvq_start = &ctlb->buf[6];
SetZip(conn);
conn->stream = rb_malloc(sizeof(zlib_stream_t));
instream = &((zlib_stream_t *)conn->stream)->instream;
outstream = &((zlib_stream_t *)conn->stream)->outstream;
instream->total_in = 0;
instream->total_out = 0;
instream->zalloc = (alloc_func) ssld_alloc;
instream->zfree = (free_func) ssld_free;
instream->data_type = Z_ASCII;
inflateInit(&((zlib_stream_t *)conn->stream)->instream);
outstream->total_in = 0;
outstream->total_out = 0;
outstream->zalloc = (alloc_func) ssld_alloc;
outstream->zfree = (free_func) ssld_free;
outstream->data_type = Z_ASCII;
if(level > 9)
level = Z_DEFAULT_COMPRESSION;
deflateInit(&((zlib_stream_t *)conn->stream)->outstream, level);
if(recvqlen > 0)
common_zlib_inflate(conn, recvq_start, recvqlen);
zlib_send_zip_ready(ctl, conn);
conn_mod_read_cb(conn->mod_fd, conn);
conn_plain_read_cb(conn->plain_fd, conn);
return;
}
#endif
static void
init_prng(mod_ctl_t * ctl, mod_ctl_buf_t * ctl_buf)
{
char *path;
prng_seed_t seed_type;
seed_type = (prng_seed_t)ctl_buf->buf[1];
path = &ctl_buf->buf[2];
rb_init_prng(path, seed_type);
}
static void
ssl_new_keys(mod_ctl_t * ctl, mod_ctl_buf_t * ctl_buf)
{
char *buf;
char *cert, *key, *dhparam;
buf = &ctl_buf->buf[2];
cert = buf;
buf += strlen(cert) + 1;
key = buf;
buf += strlen(key) + 1;
dhparam = buf;
if(strlen(dhparam) == 0)
dhparam = NULL;
if(!rb_setup_ssl_server(cert, key, dhparam))
{
const char *invalid = "I";
mod_cmd_write_queue(ctl, invalid, strlen(invalid));
return;
}
}
static void
send_nossl_support(mod_ctl_t *ctl, mod_ctl_buf_t *ctlb)
{
static const char *nossl_cmd = "N";
conn_t *conn;
int32_t id;
if(ctlb != NULL)
{
conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]);
id = buf_to_int32(&ctlb->buf[1]);
if(id >= 0)
conn_add_id_hash(conn, id);
close_conn(conn, WAIT_PLAIN, "libratbox reports no SSL/TLS support");
}
mod_cmd_write_queue(ctl, nossl_cmd, strlen(nossl_cmd));
}
static void
send_i_am_useless(mod_ctl_t *ctl)
{
static const char *useless = "U";
mod_cmd_write_queue(ctl, useless, strlen(useless));
}
static void
send_nozlib_support(mod_ctl_t *ctl, mod_ctl_buf_t *ctlb)
{
static const char *nozlib_cmd = "z";
conn_t *conn;
int32_t id;
if(ctlb != NULL)
{
conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]);
id = buf_to_int32(&ctlb->buf[1]);
if(id >= 0)
conn_add_id_hash(conn, id);
close_conn(conn, WAIT_PLAIN, "libratbox reports no zlib support");
}
mod_cmd_write_queue(ctl, nozlib_cmd, strlen(nozlib_cmd));
}
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(!ssl_ok)
{
send_nossl_support(ctl, ctl_buf);
break;
}
ssl_process_accept(ctl, ctl_buf);
break;
}
case 'C':
{
if(!ssl_ok)
{
send_nossl_support(ctl, ctl_buf);
break;
}
ssl_process_connect(ctl, ctl_buf);
break;
}
case 'K':
{
if(!ssl_ok)
{
send_nossl_support(ctl, ctl_buf);
break;
}
ssl_new_keys(ctl, ctl_buf);
break;
}
case 'I':
init_prng(ctl, ctl_buf);
break;
case 'S':
{
process_stats(ctl, ctl_buf);
break;
}
#ifdef HAVE_LIBZ
case 'Z':
{
/* just zlib only */
zlib_process(ctl, ctl_buf);
break;
}
#else
case 'Y':
case 'Z':
send_nozlib_support(ctl, ctl_buf);
break;
#endif
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;
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);
}
}
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);
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);
rb_setselect(ctl->F, RB_SELECT_WRITE, mod_write_ctl, ctl);
}
}
static void
read_pipe_ctl(rb_fde_t * F, void *data)
{
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;
int ctlfd, pipefd, x, maxfd;
maxfd = maxconn();
s_ctlfd = getenv("CTL_FD");
s_pipe = getenv("CTL_PIPE");
if(s_ctlfd == NULL || s_pipe == NULL)
{
fprintf(stderr, "This is ircd-ratbox ssld. You know you aren't supposed to run me directly?\n");
fprintf(stderr, "You get an Id tag for this: $Id: ssld.c 25677 2008-07-06 04:21:42Z androsyn $\n");
fprintf(stderr, "Have a nice life\n");
exit(1);
}
ctlfd = atoi(s_ctlfd);
pipefd = atoi(s_pipe);
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);
}
setup_signals();
rb_lib_init(NULL, NULL, NULL, 0, maxfd, 1024, 4096);
rb_init_rawbuffers(1024);
ssl_ok = rb_supports_ssl();
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);
rb_event_add("check_handshake_flood", check_handshake_flood, NULL, 10);
read_pipe_ctl(mod_ctl->F_pipe, NULL);
mod_read_ctl(mod_ctl->F, mod_ctl);
if(!zlib_ok && !ssl_ok)
{
/* this is really useless... */
send_i_am_useless(mod_ctl);
/* sleep until the ircd kills us */
rb_sleep(2<<30, 0);
exit(1);
}
if(!zlib_ok)
send_nozlib_support(mod_ctl, NULL);
if(!ssl_ok)
send_nossl_support(mod_ctl, NULL);
rb_lib_loop(0);
return 0;
}
static void
dummy_handler(int sig)
{
return;
}
static void
setup_signals()
{
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);
}