/* * ssld.c: The ircd-ratbox ssl/zlib helper daemon thingy * Copyright (C) 2007 Aaron Sethman * Copyright (C) 2007-2012 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 29265 2015-12-20 04:35:39Z androsyn $ */ #include "stdinc.h" #ifdef HAVE_ZLIB #include #endif #define MAXPASSFD 4 #ifndef READBUF_SIZE #define READBUF_SIZE 16384 #endif static void setup_signals(void); static pid_t ppid; 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; } #if 0 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; } #endif static char inbuf[READBUF_SIZE]; #ifdef HAVE_ZLIB 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_ZLIB 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 FLAG_ZIPSSL 0x40 #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 IsZipSSL(x) ((x)->flags & FLAG_ZIPSSL) #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 SetZipSSL(x) ((x)->flags |= FLAG_ZIPSSL) #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 ClearZipSSL(x) ((x)->flags &= ~FLAG_ZIPSSL) #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 conn_plain_read_shutdown_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_ZLIB static int zlib_ok = 1; #else static int zlib_ok = 0; #endif #ifdef HAVE_ZLIB 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_ZLIB 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(conn->id >= 0 && !IsZipSSL(conn)) rb_dlinkDelete(&conn->node, connid_hash(conn->id)); if(!wait_plain || fmt == NULL) { rb_close(conn->plain_fd); rb_dlinkAdd(conn, &conn->node, &dead_list); return; } rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_shutdown_cb, conn); rb_setselect(conn->plain_fd, RB_SELECT_WRITE, 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; /* we need both, not just one..bail if NULL */ if(mod_fd == NULL || plain_fd == NULL) return NULL; 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_ZLIB 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 = 0; ((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_ZLIB 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_plain_read_shutdown_cb(rb_fde_t *fd, void *data) { conn_t *conn = data; int length = 0; if(conn == NULL) return; while(1) { length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf)); if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) { rb_close(conn->plain_fd); rb_dlinkAdd(conn, &conn->node, &dead_list); return; } if(length < 0) { rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_shutdown_cb, 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_ZLIB 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 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 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]); if(conn == NULL) { /* give up.. */ rb_close(ctlb->F[0]); rb_close(ctlb->F[1]); return; } 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]); if(conn == NULL) { /* give up.. */ rb_close(ctlb->F[0]); rb_close(ctlb->F[1]); return; } 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 */ } static void change_connid(mod_ctl_t *ctl, mod_ctl_buf_t *ctlb) { int32_t id = buf_to_int32(&ctlb->buf[1]); int32_t newid = buf_to_int32(&ctlb->buf[5]); conn_t *conn = conn_find_by_id(id); if(conn->id >= 0) rb_dlinkDelete(&conn->node, connid_hash(conn->id)); SetZipSSL(conn); conn->id = newid; } #ifdef HAVE_ZLIB 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(conn == NULL) { rb_close(ctlb->F[0]); rb_close(ctlb->F[1]); return; } 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); 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]); if(conn == NULL) { rb_close(ctlb->F[0]); rb_close(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]); if(conn == NULL) { rb_close(ctlb->F[0]); rb_close(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 (ctl_buf->nfds != 2 || ctl_buf->buflen != 5) { cleanup_bad_message(ctl, ctl_buf); break; } if(!ssl_ok) { send_nossl_support(ctl, ctl_buf); break; } ssl_process_accept(ctl, ctl_buf); break; } case 'C': { if (ctl_buf->nfds != 2 || ctl_buf->buflen != 5) { cleanup_bad_message(ctl, ctl_buf); break; } 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; } case 'Y': { change_connid(ctl, ctl_buf); break; } #ifdef HAVE_ZLIB case 'Z': { if (ctl_buf->nfds != 2 || ctl_buf->buflen < 6) { cleanup_bad_message(ctl, ctl_buf); break; } /* just zlib only */ zlib_process(ctl, ctl_buf); break; } #else 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; 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) { 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 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 29265 2015-12-20 04:35:39Z androsyn $\n"); fprintf(stderr, "Have a nice life\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); 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 << 29, 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; } #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); sigaction(SIGPIPE, &act, 0); sigaddset(&act.sa_mask, SIGALRM); sigaction(SIGALRM, &act, 0); sigaddset(&act.sa_mask, SIGINT); sigaction(SIGINT, &act, 0); #ifdef SIGTRAP sigaddset(&act.sa_mask, SIGTRAP); sigaction(SIGTRAP, &act, 0); #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 }