/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved. */ /* * Copyright 2011 Nexenta Systems, Inc. All rights reserved. */ /* * nfs_tbind.c, common part for nfsd and lockd. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nfs_tbind.h" #include #include #include #include #include #include #include /* * Determine valid semantics for most applications. */ #define OK_TPI_TYPE(_nconf) \ (_nconf->nc_semantics == NC_TPI_CLTS || \ _nconf->nc_semantics == NC_TPI_COTS || \ _nconf->nc_semantics == NC_TPI_COTS_ORD) #define BE32_TO_U32(a) \ ((((ulong_t)((uchar_t *)a)[0] & 0xFF) << (ulong_t)24) | \ (((ulong_t)((uchar_t *)a)[1] & 0xFF) << (ulong_t)16) | \ (((ulong_t)((uchar_t *)a)[2] & 0xFF) << (ulong_t)8) | \ ((ulong_t)((uchar_t *)a)[3] & 0xFF)) /* * Number of elements to add to the poll array on each allocation. */ #define POLL_ARRAY_INC_SIZE 64 /* * Number of file descriptors by which the process soft limit may be * increased on each call to nofile_increase(0). */ #define NOFILE_INC_SIZE 64 /* * Default TCP send and receive buffer size of NFS server. */ #define NFSD_TCP_BUFSZ (1024*1024) struct conn_ind { struct conn_ind *conn_next; struct conn_ind *conn_prev; struct t_call *conn_call; }; struct conn_entry { bool_t closing; struct netconfig nc; }; /* * this file contains transport routines common to nfsd and lockd */ static int nofile_increase(int); static int reuseaddr(int); static int recvucred(int); static int anonmlp(int); static void add_to_poll_list(int, struct netconfig *); static char *serv_name_to_port_name(char *); static int bind_to_proto(char *, char *, struct netbuf **, struct netconfig **); static int bind_to_provider(char *, char *, struct netbuf **, struct netconfig **); static void conn_close_oldest(void); static boolean_t conn_get(int, struct netconfig *, struct conn_ind **); static void cots_listen_event(int, int); static int discon_get(int, struct netconfig *, struct conn_ind **); static int do_poll_clts_action(int, int); static int do_poll_cots_action(int, int); static void remove_from_poll_list(int); static int set_addrmask(int, struct netconfig *, struct netbuf *); static int is_listen_fd_index(int); static struct pollfd *poll_array; static struct conn_entry *conn_polled; static int num_conns; /* Current number of connections */ int (*Mysvc4)(int, struct netbuf *, struct netconfig *, int, struct netbuf *); static int setopt(int fd, int level, int name, int value); static int get_opt(int fd, int level, int name); static void nfslib_set_sockbuf(int fd); /* * Called to create and prepare a transport descriptor for in-kernel * RPC service. * Returns -1 on failure and a valid descriptor on success. */ int nfslib_transport_open(struct netconfig *nconf) { int fd; struct strioctl strioc; if ((nconf == (struct netconfig *)NULL) || (nconf->nc_device == (char *)NULL)) { syslog(LOG_ERR, "no netconfig device"); return (-1); } /* * Open the transport device. */ fd = t_open(nconf->nc_device, O_RDWR, (struct t_info *)NULL); if (fd == -1) { if (t_errno == TSYSERR && errno == EMFILE && (nofile_increase(0) == 0)) { /* Try again with a higher NOFILE limit. */ fd = t_open(nconf->nc_device, O_RDWR, (struct t_info *)NULL); } if (fd == -1) { syslog(LOG_ERR, "t_open %s failed: t_errno %d, %m", nconf->nc_device, t_errno); return (-1); } } /* * Pop timod because the RPC module must be as close as possible * to the transport. */ if (ioctl(fd, I_POP, 0) < 0) { syslog(LOG_ERR, "I_POP of timod failed: %m"); (void) t_close(fd); return (-1); } /* * Common code for CLTS and COTS transports */ if (ioctl(fd, I_PUSH, "rpcmod") < 0) { syslog(LOG_ERR, "I_PUSH of rpcmod failed: %m"); (void) t_close(fd); return (-1); } strioc.ic_cmd = RPC_SERVER; strioc.ic_dp = (char *)0; strioc.ic_len = 0; strioc.ic_timout = -1; /* Tell rpcmod to act like a server stream. */ if (ioctl(fd, I_STR, &strioc) < 0) { syslog(LOG_ERR, "rpcmod set-up ioctl failed: %m"); (void) t_close(fd); return (-1); } /* * Re-push timod so that we will still be doing TLI * operations on the descriptor. */ if (ioctl(fd, I_PUSH, "timod") < 0) { syslog(LOG_ERR, "I_PUSH of timod failed: %m"); (void) t_close(fd); return (-1); } /* * Enable options of returning the ip's for udp. */ if (strcmp(nconf->nc_netid, "udp6") == 0) __rpc_tli_set_options(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, 1); else if (strcmp(nconf->nc_netid, "udp") == 0) __rpc_tli_set_options(fd, IPPROTO_IP, IP_RECVDSTADDR, 1); return (fd); } static int nofile_increase(int limit) { struct rlimit rl; if (getrlimit(RLIMIT_NOFILE, &rl) == -1) { syslog(LOG_ERR, "getrlimit of NOFILE failed: %m"); return (-1); } if (limit > 0) rl.rlim_cur = limit; else rl.rlim_cur += NOFILE_INC_SIZE; if (rl.rlim_cur > rl.rlim_max && rl.rlim_max != RLIM_INFINITY) rl.rlim_max = rl.rlim_cur; if (setrlimit(RLIMIT_NOFILE, &rl) == -1) { syslog(LOG_ERR, "setrlimit of NOFILE to %d failed: %m", rl.rlim_cur); return (-1); } return (0); } static void nfslib_set_sockbuf(int fd) { int curval, val; val = NFSD_TCP_BUFSZ; curval = get_opt(fd, SOL_SOCKET, SO_SNDBUF); syslog(LOG_DEBUG, "Current SO_SNDBUF value is %d", curval); if ((curval != -1) && (curval < val)) { syslog(LOG_DEBUG, "Set SO_SNDBUF option to %d", val); if (setopt(fd, SOL_SOCKET, SO_SNDBUF, val) < 0) { syslog(LOG_ERR, "couldn't set SO_SNDBUF to %d - t_errno = %d", val, t_errno); syslog(LOG_ERR, "Check and increase system-wide tcp_max_buf"); } } curval = get_opt(fd, SOL_SOCKET, SO_RCVBUF); syslog(LOG_DEBUG, "Current SO_RCVBUF value is %d", curval); if ((curval != -1) && (curval < val)) { syslog(LOG_DEBUG, "Set SO_RCVBUF option to %d", val); if (setopt(fd, SOL_SOCKET, SO_RCVBUF, val) < 0) { syslog(LOG_ERR, "couldn't set SO_RCVBUF to %d - t_errno = %d", val, t_errno); syslog(LOG_ERR, "Check and increase system-wide tcp_max_buf"); } } } int nfslib_bindit(struct netconfig *nconf, struct netbuf **addr, struct nd_hostserv *hs, int backlog) { int fd; struct t_bind *ntb; struct t_bind tb; struct nd_addrlist *addrlist; struct t_optmgmt req, resp; struct opthdr *opt; char reqbuf[128]; bool_t use_any = FALSE; bool_t gzone = TRUE; if ((fd = nfslib_transport_open(nconf)) == -1) { syslog(LOG_ERR, "cannot establish transport service over %s", nconf->nc_device); return (-1); } addrlist = (struct nd_addrlist *)NULL; /* nfs4_callback service does not used a fieed port number */ if (strcmp(hs->h_serv, "nfs4_callback") == 0) { tb.addr.maxlen = 0; tb.addr.len = 0; tb.addr.buf = 0; use_any = TRUE; gzone = (getzoneid() == GLOBAL_ZONEID); } else if (netdir_getbyname(nconf, hs, &addrlist) != 0) { syslog(LOG_ERR, "Cannot get address for transport %s host %s service %s", nconf->nc_netid, hs->h_host, hs->h_serv); (void) t_close(fd); return (-1); } if (strcmp(nconf->nc_proto, "tcp") == 0) { /* * If we're running over TCP, then set the * SO_REUSEADDR option so that we can bind * to our preferred address even if previously * left connections exist in FIN_WAIT states. * This is somewhat bogus, but otherwise you have * to wait 2 minutes to restart after killing it. */ if (reuseaddr(fd) == -1) { syslog(LOG_WARNING, "couldn't set SO_REUSEADDR option on transport"); } } else if (strcmp(nconf->nc_proto, "udp") == 0) { /* * In order to run MLP on UDP, we need to handle creds. */ if (recvucred(fd) == -1) { syslog(LOG_WARNING, "couldn't set SO_RECVUCRED option on transport"); } } /* * Make non global zone nfs4_callback port MLP */ if (use_any && is_system_labeled() && !gzone) { if (anonmlp(fd) == -1) { /* * failing to set this option means nfs4_callback * could fail silently later. So fail it with * with an error message now. */ syslog(LOG_ERR, "couldn't set SO_ANON_MLP option on transport"); (void) t_close(fd); return (-1); } } if (nconf->nc_semantics == NC_TPI_CLTS) tb.qlen = 0; else tb.qlen = backlog; /* LINTED pointer alignment */ ntb = (struct t_bind *)t_alloc(fd, T_BIND, T_ALL); if (ntb == (struct t_bind *)NULL) { syslog(LOG_ERR, "t_alloc failed: t_errno %d, %m", t_errno); (void) t_close(fd); netdir_free((void *)addrlist, ND_ADDRLIST); return (-1); } /* * XXX - what about the space tb->addr.buf points to? This should * be either a memcpy() to/from the buf fields, or t_alloc(fd,T_BIND,) * should't be called with T_ALL. */ if (addrlist) tb.addr = *(addrlist->n_addrs); /* structure copy */ if (t_bind(fd, &tb, ntb) == -1) { syslog(LOG_ERR, "t_bind failed: t_errno %d, %m", t_errno); (void) t_free((char *)ntb, T_BIND); netdir_free((void *)addrlist, ND_ADDRLIST); (void) t_close(fd); return (-1); } /* make sure we bound to the right address */ if (use_any == FALSE && (tb.addr.len != ntb->addr.len || memcmp(tb.addr.buf, ntb->addr.buf, tb.addr.len) != 0)) { syslog(LOG_ERR, "t_bind to wrong address"); (void) t_free((char *)ntb, T_BIND); netdir_free((void *)addrlist, ND_ADDRLIST); (void) t_close(fd); return (-1); } /* * Call nfs4svc_setport so that the kernel can be * informed what port number the daemon is listing * for incoming connection requests. */ if ((nconf->nc_semantics == NC_TPI_COTS || nconf->nc_semantics == NC_TPI_COTS_ORD) && Mysvc4 != NULL) (*Mysvc4)(fd, NULL, nconf, NFS4_SETPORT, &ntb->addr); *addr = &ntb->addr; netdir_free((void *)addrlist, ND_ADDRLIST); if (strcmp(nconf->nc_proto, "tcp") == 0) { /* * Disable the Nagle algorithm on TCP connections. * Connections accepted from this listener will * inherit the listener options. */ /* LINTED pointer alignment */ opt = (struct opthdr *)reqbuf; opt->level = IPPROTO_TCP; opt->name = TCP_NODELAY; opt->len = sizeof (int); /* LINTED pointer alignment */ *(int *)((char *)opt + sizeof (*opt)) = 1; req.flags = T_NEGOTIATE; req.opt.len = sizeof (*opt) + opt->len; req.opt.buf = (char *)opt; resp.flags = 0; resp.opt.buf = reqbuf; resp.opt.maxlen = sizeof (reqbuf); if (t_optmgmt(fd, &req, &resp) < 0 || resp.flags != T_SUCCESS) { syslog(LOG_ERR, "couldn't set NODELAY option for proto %s: t_errno = %d, %m", nconf->nc_proto, t_errno); } nfslib_set_sockbuf(fd); } return (fd); } static int get_opt(int fd, int level, int name) { struct t_optmgmt req, res; struct { struct opthdr opt; int value; } reqbuf; reqbuf.opt.level = level; reqbuf.opt.name = name; reqbuf.opt.len = sizeof (int); reqbuf.value = 0; req.flags = T_CURRENT; req.opt.len = sizeof (reqbuf); req.opt.buf = (char *)&reqbuf; res.flags = 0; res.opt.buf = (char *)&reqbuf; res.opt.maxlen = sizeof (reqbuf); if (t_optmgmt(fd, &req, &res) < 0 || res.flags != T_SUCCESS) { t_error("t_optmgmt"); return (-1); } return (reqbuf.value); } static int setopt(int fd, int level, int name, int value) { struct t_optmgmt req, resp; struct { struct opthdr opt; int value; } reqbuf; reqbuf.opt.level = level; reqbuf.opt.name = name; reqbuf.opt.len = sizeof (int); reqbuf.value = value; req.flags = T_NEGOTIATE; req.opt.len = sizeof (reqbuf); req.opt.buf = (char *)&reqbuf; resp.flags = 0; resp.opt.buf = (char *)&reqbuf; resp.opt.maxlen = sizeof (reqbuf); if (t_optmgmt(fd, &req, &resp) < 0 || resp.flags != T_SUCCESS) { t_error("t_optmgmt"); return (-1); } return (0); } static int reuseaddr(int fd) { return (setopt(fd, SOL_SOCKET, SO_REUSEADDR, 1)); } static int recvucred(int fd) { return (setopt(fd, SOL_SOCKET, SO_RECVUCRED, 1)); } static int anonmlp(int fd) { return (setopt(fd, SOL_SOCKET, SO_ANON_MLP, 1)); } void nfslib_log_tli_error(char *tli_name, int fd, struct netconfig *nconf) { int error; /* * Save the error code across syslog(), just in case syslog() * gets its own error and, therefore, overwrites errno. */ error = errno; if (t_errno == TSYSERR) { syslog(LOG_ERR, "%s(file descriptor %d/transport %s) %m", tli_name, fd, nconf->nc_proto); } else { syslog(LOG_ERR, "%s(file descriptor %d/transport %s) TLI error %d", tli_name, fd, nconf->nc_proto, t_errno); } errno = error; } /* * Called to set up service over a particular transport. */ void do_one(char *provider, NETSELDECL(proto), struct protob *protobp0, int (*svc)(int, struct netbuf, struct netconfig *)) { register int sock; struct protob *protobp; struct netbuf *retaddr; struct netconfig *retnconf; struct netbuf addrmask; int vers; int err; int l; if (provider) sock = bind_to_provider(provider, protobp0->serv, &retaddr, &retnconf); else sock = bind_to_proto(proto, protobp0->serv, &retaddr, &retnconf); if (sock == -1) { (void) syslog(LOG_ERR, "Cannot establish %s service over %s: transport setup problem.", protobp0->serv, provider ? provider : proto); return; } if (set_addrmask(sock, retnconf, &addrmask) < 0) { (void) syslog(LOG_ERR, "Cannot set address mask for %s", retnconf->nc_netid); return; } /* * Register all versions of the programs in the protocol block list. */ l = strlen(NC_UDP); for (protobp = protobp0; protobp; protobp = protobp->next) { for (vers = protobp->versmin; vers <= protobp->versmax; vers++) { if ((protobp->program == NFS_PROGRAM || protobp->program == NFS_ACL_PROGRAM) && vers == NFS_V4 && strncasecmp(retnconf->nc_proto, NC_UDP, l) == 0) continue; (void) rpcb_unset(protobp->program, vers, retnconf); (void) rpcb_set(protobp->program, vers, retnconf, retaddr); } } /* * Register services with CLTS semantics right now. * Note: services with COTS/COTS_ORD semantics will be * registered later from cots_listen_event function. */ if (retnconf->nc_semantics == NC_TPI_CLTS) { /* Don't drop core if supporting module(s) aren't loaded. */ (void) signal(SIGSYS, SIG_IGN); /* * svc() doesn't block, it returns success or failure. */ if (svc == NULL && Mysvc4 != NULL) err = (*Mysvc4)(sock, &addrmask, retnconf, NFS4_SETPORT|NFS4_KRPC_START, retaddr); else err = (*svc)(sock, addrmask, retnconf); if (err < 0) { (void) syslog(LOG_ERR, "Cannot establish %s service over : %m. Exiting", protobp0->serv, sock, retnconf->nc_proto); exit(1); } } free(addrmask.buf); /* * We successfully set up the server over this transport. * Add this descriptor to the one being polled on. */ add_to_poll_list(sock, retnconf); } /* * Set up the NFS service over all the available transports. * Returns -1 for failure, 0 for success. */ int do_all(struct protob *protobp, int (*svc)(int, struct netbuf, struct netconfig *)) { struct netconfig *nconf; NCONF_HANDLE *nc; int l; if ((nc = setnetconfig()) == (NCONF_HANDLE *)NULL) { syslog(LOG_ERR, "setnetconfig failed: %m"); return (-1); } l = strlen(NC_UDP); while (nconf = getnetconfig(nc)) { if ((nconf->nc_flag & NC_VISIBLE) && strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0 && OK_TPI_TYPE(nconf) && (protobp->program != NFS4_CALLBACK || strncasecmp(nconf->nc_proto, NC_UDP, l) != 0)) do_one(nconf->nc_device, nconf->nc_proto, protobp, svc); } (void) endnetconfig(nc); return (0); } /* * poll on the open transport descriptors for events and errors. */ void poll_for_action(void) { int nfds; int i; /* * Keep polling until all transports have been closed. When this * happens, we return. */ while ((int)num_fds > 0) { nfds = poll(poll_array, num_fds, INFTIM); switch (nfds) { case 0: continue; case -1: /* * Some errors from poll could be * due to temporary conditions, and we try to * be robust in the face of them. Other * errors (should never happen in theory) * are fatal (eg. EINVAL, EFAULT). */ switch (errno) { case EINTR: continue; case EAGAIN: case ENOMEM: (void) sleep(10); continue; default: (void) syslog(LOG_ERR, "poll failed: %m. Exiting"); exit(1); } default: break; } /* * Go through the poll list looking for events. */ for (i = 0; i < num_fds && nfds > 0; i++) { if (poll_array[i].revents) { nfds--; /* * We have a message, so try to read it. * Record the error return in errno, * so that syslog(LOG_ERR, "...%m") * dumps the corresponding error string. */ if (conn_polled[i].nc.nc_semantics == NC_TPI_CLTS) { errno = do_poll_clts_action( poll_array[i].fd, i); } else { errno = do_poll_cots_action( poll_array[i].fd, i); } if (errno == 0) continue; /* * Most returned error codes mean that there is * fatal condition which we can only deal with * by closing the transport. */ if (errno != EAGAIN && errno != ENOMEM) { (void) syslog(LOG_ERR, "Error (%m) reading descriptor %d/transport %s. Closing it.", poll_array[i].fd, conn_polled[i].nc.nc_proto); (void) t_close(poll_array[i].fd); remove_from_poll_list(poll_array[i].fd); } else if (errno == ENOMEM) (void) sleep(5); } } } (void) syslog(LOG_ERR, "All transports have been closed with errors. Exiting."); } /* * Allocate poll/transport array entries for this descriptor. */ static void add_to_poll_list(int fd, struct netconfig *nconf) { static int poll_array_size = 0; /* * If the arrays are full, allocate new ones. */ if (num_fds == poll_array_size) { struct pollfd *tpa; struct conn_entry *tnp; if (poll_array_size != 0) { tpa = poll_array; tnp = conn_polled; } else tpa = (struct pollfd *)0; poll_array_size += POLL_ARRAY_INC_SIZE; /* * Allocate new arrays. */ poll_array = (struct pollfd *) malloc(poll_array_size * sizeof (struct pollfd) + 256); conn_polled = (struct conn_entry *) malloc(poll_array_size * sizeof (struct conn_entry) + 256); if (poll_array == (struct pollfd *)NULL || conn_polled == (struct conn_entry *)NULL) { syslog(LOG_ERR, "malloc failed for poll array"); exit(1); } /* * Copy the data of the old ones into new arrays, and * free the old ones. */ if (tpa) { (void) memcpy((void *)poll_array, (void *)tpa, num_fds * sizeof (struct pollfd)); (void) memcpy((void *)conn_polled, (void *)tnp, num_fds * sizeof (struct conn_entry)); free((void *)tpa); free((void *)tnp); } } /* * Set the descriptor and event list. All possible events are * polled for. */ poll_array[num_fds].fd = fd; poll_array[num_fds].events = POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI; /* * Copy the transport data over too. */ conn_polled[num_fds].nc = *nconf; conn_polled[num_fds].closing = 0; /* * Set the descriptor to non-blocking. Avoids a race * between data arriving on the stream and then having it * flushed before we can read it. */ if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) { (void) syslog(LOG_ERR, "fcntl(file desc. %d/transport %s, F_SETFL, O_NONBLOCK): %m. Exiting", num_fds, nconf->nc_proto); exit(1); } /* * Count this descriptor. */ ++num_fds; } static void remove_from_poll_list(int fd) { int i; int num_to_copy; for (i = 0; i < num_fds; i++) { if (poll_array[i].fd == fd) { --num_fds; num_to_copy = num_fds - i; (void) memcpy((void *)&poll_array[i], (void *)&poll_array[i+1], num_to_copy * sizeof (struct pollfd)); (void) memset((void *)&poll_array[num_fds], 0, sizeof (struct pollfd)); (void) memcpy((void *)&conn_polled[i], (void *)&conn_polled[i+1], num_to_copy * sizeof (struct conn_entry)); (void) memset((void *)&conn_polled[num_fds], 0, sizeof (struct conn_entry)); return; } } syslog(LOG_ERR, "attempt to remove nonexistent fd from poll list"); } /* * Called to read and interpret the event on a connectionless descriptor. * Returns 0 if successful, or a UNIX error code if failure. */ static int do_poll_clts_action(int fd, int conn_index) { int error; int ret; int flags; struct netconfig *nconf = &conn_polled[conn_index].nc; static struct t_unitdata *unitdata = NULL; static struct t_uderr *uderr = NULL; static int oldfd = -1; struct nd_hostservlist *host = NULL; struct strbuf ctl[1], data[1]; /* * We just need to have some space to consume the * message in the event we can't use the TLI interface to do the * job. * * We flush the message using getmsg(). For the control part * we allocate enough for any TPI header plus 32 bytes for address * and options. For the data part, there is nothing magic about * the size of the array, but 256 bytes is probably better than * 1 byte, and we don't expect any data portion anyway. * * If the array sizes are too small, we handle this because getmsg() * (called to consume the message) will return MOREDATA|MORECTL. * Thus we just call getmsg() until it's read the message. */ char ctlbuf[sizeof (union T_primitives) + 32]; char databuf[256]; /* * If this is the same descriptor as the last time * do_poll_clts_action was called, we can save some * de-allocation and allocation. */ if (oldfd != fd) { oldfd = fd; if (unitdata) { (void) t_free((char *)unitdata, T_UNITDATA); unitdata = NULL; } if (uderr) { (void) t_free((char *)uderr, T_UDERROR); uderr = NULL; } } /* * Allocate a unitdata structure for receiving the event. */ if (unitdata == NULL) { /* LINTED pointer alignment */ unitdata = (struct t_unitdata *)t_alloc(fd, T_UNITDATA, T_ALL); if (unitdata == NULL) { if (t_errno == TSYSERR) { /* * Save the error code across * syslog(), just in case * syslog() gets its own error * and therefore overwrites errno. */ error = errno; (void) syslog(LOG_ERR, "t_alloc(file descriptor %d/transport %s, T_UNITDATA) failed: %m", fd, nconf->nc_proto); return (error); } (void) syslog(LOG_ERR, "t_alloc(file descriptor %d/transport %s, T_UNITDATA) failed TLI error %d", fd, nconf->nc_proto, t_errno); goto flush_it; } } try_again: flags = 0; /* * The idea is we wait for T_UNITDATA_IND's. Of course, * we don't get any, because rpcmod filters them out. * However, we need to call t_rcvudata() to let TLI * tell us we have a T_UDERROR_IND. * * algorithm is: * t_rcvudata(), expecting TLOOK. * t_look(), expecting T_UDERR. * t_rcvuderr(), expecting success (0). * expand destination address into ASCII, * and dump it. */ ret = t_rcvudata(fd, unitdata, &flags); if (ret == 0 || t_errno == TBUFOVFLW) { (void) syslog(LOG_WARNING, "t_rcvudata(file descriptor %d/transport %s) got unexpected data, %d bytes", fd, nconf->nc_proto, unitdata->udata.len); /* * Even though we don't expect any data, in case we do, * keep reading until there is no more. */ if (flags & T_MORE) goto try_again; return (0); } switch (t_errno) { case TNODATA: return (0); case TSYSERR: /* * System errors are returned to caller. * Save the error code across * syslog(), just in case * syslog() gets its own error * and therefore overwrites errno. */ error = errno; (void) syslog(LOG_ERR, "t_rcvudata(file descriptor %d/transport %s) %m", fd, nconf->nc_proto); return (error); case TLOOK: break; default: (void) syslog(LOG_ERR, "t_rcvudata(file descriptor %d/transport %s) TLI error %d", fd, nconf->nc_proto, t_errno); goto flush_it; } ret = t_look(fd); switch (ret) { case 0: return (0); case -1: /* * System errors are returned to caller. */ if (t_errno == TSYSERR) { /* * Save the error code across * syslog(), just in case * syslog() gets its own error * and therefore overwrites errno. */ error = errno; (void) syslog(LOG_ERR, "t_look(file descriptor %d/transport %s) %m", fd, nconf->nc_proto); return (error); } (void) syslog(LOG_ERR, "t_look(file descriptor %d/transport %s) TLI error %d", fd, nconf->nc_proto, t_errno); goto flush_it; case T_UDERR: break; default: (void) syslog(LOG_WARNING, "t_look(file descriptor %d/transport %s) returned %d not T_UDERR (%d)", fd, nconf->nc_proto, ret, T_UDERR); } if (uderr == NULL) { /* LINTED pointer alignment */ uderr = (struct t_uderr *)t_alloc(fd, T_UDERROR, T_ALL); if (uderr == NULL) { if (t_errno == TSYSERR) { /* * Save the error code across * syslog(), just in case * syslog() gets its own error * and therefore overwrites errno. */ error = errno; (void) syslog(LOG_ERR, "t_alloc(file descriptor %d/transport %s, T_UDERROR) failed: %m", fd, nconf->nc_proto); return (error); } (void) syslog(LOG_ERR, "t_alloc(file descriptor %d/transport %s, T_UDERROR) failed TLI error: %d", fd, nconf->nc_proto, t_errno); goto flush_it; } } ret = t_rcvuderr(fd, uderr); if (ret == 0) { /* * Save the datagram error in errno, so that the * %m argument to syslog picks up the error string. */ errno = uderr->error; /* * Log the datagram error, then log the host that * probably triggerred. Cannot log both in the * same transaction because of packet size limitations * in /dev/log. */ (void) syslog((errno == ECONNREFUSED) ? LOG_DEBUG : LOG_WARNING, "NFS response over generated error: %m", fd, nconf->nc_proto); /* * Try to map the client's address back to a * name. */ ret = netdir_getbyaddr(nconf, &host, &uderr->addr); if (ret != -1 && host && host->h_cnt > 0 && host->h_hostservs) { (void) syslog((errno == ECONNREFUSED) ? LOG_DEBUG : LOG_WARNING, "Bad NFS response was sent to client with host name: %s; service port: %s", host->h_hostservs->h_host, host->h_hostservs->h_serv); } else { int i, j; char *buf; char *hex = "0123456789abcdef"; /* * Mapping failed, print the whole thing * in ASCII hex. */ buf = (char *)malloc(uderr->addr.len * 2 + 1); for (i = 0, j = 0; i < uderr->addr.len; i++, j += 2) { buf[j] = hex[((uderr->addr.buf[i]) >> 4) & 0xf]; buf[j+1] = hex[uderr->addr.buf[i] & 0xf]; } buf[j] = '\0'; (void) syslog((errno == ECONNREFUSED) ? LOG_DEBUG : LOG_WARNING, "Bad NFS response was sent to client with transport address: 0x%s", buf); free((void *)buf); } if (ret == 0 && host != NULL) netdir_free((void *)host, ND_HOSTSERVLIST); return (0); } switch (t_errno) { case TNOUDERR: goto flush_it; case TSYSERR: /* * System errors are returned to caller. * Save the error code across * syslog(), just in case * syslog() gets its own error * and therefore overwrites errno. */ error = errno; (void) syslog(LOG_ERR, "t_rcvuderr(file descriptor %d/transport %s) %m", fd, nconf->nc_proto); return (error); default: (void) syslog(LOG_ERR, "t_rcvuderr(file descriptor %d/transport %s) TLI error %d", fd, nconf->nc_proto, t_errno); goto flush_it; } flush_it: /* * If we get here, then we could not cope with whatever message * we attempted to read, so flush it. If we did read a message, * and one isn't present, that is all right, because fd is in * nonblocking mode. */ (void) syslog(LOG_ERR, "Flushing one input message from ", fd, nconf->nc_proto); /* * Read and discard the message. Do this this until there is * no more control/data in the message or until we get an error. */ do { ctl->maxlen = sizeof (ctlbuf); ctl->buf = ctlbuf; data->maxlen = sizeof (databuf); data->buf = databuf; flags = 0; ret = getmsg(fd, ctl, data, &flags); if (ret == -1) return (errno); } while (ret != 0); return (0); } static void conn_close_oldest(void) { int fd; int i1; /* * Find the oldest connection that is not already in the * process of shutting down. */ for (i1 = end_listen_fds; /* no conditional expression */; i1++) { if (i1 >= num_fds) return; if (conn_polled[i1].closing == 0) break; } #ifdef DEBUG printf("too many connections (%d), releasing oldest (%d)\n", num_conns, poll_array[i1].fd); #else syslog(LOG_WARNING, "too many connections (%d), releasing oldest (%d)", num_conns, poll_array[i1].fd); #endif fd = poll_array[i1].fd; if (conn_polled[i1].nc.nc_semantics == NC_TPI_COTS) { /* * For politeness, send a T_DISCON_REQ to the transport * provider. We close the stream anyway. */ (void) t_snddis(fd, (struct t_call *)0); num_conns--; remove_from_poll_list(fd); (void) t_close(fd); } else { /* * For orderly release, we do not close the stream * until the T_ORDREL_IND arrives to complete * the handshake. */ if (t_sndrel(fd) == 0) conn_polled[i1].closing = 1; } } static boolean_t conn_get(int fd, struct netconfig *nconf, struct conn_ind **connp) { struct conn_ind *conn; struct conn_ind *next_conn; conn = (struct conn_ind *)malloc(sizeof (*conn)); if (conn == NULL) { syslog(LOG_ERR, "malloc for listen indication failed"); return (FALSE); } /* LINTED pointer alignment */ conn->conn_call = (struct t_call *)t_alloc(fd, T_CALL, T_ALL); if (conn->conn_call == NULL) { free((char *)conn); nfslib_log_tli_error("t_alloc", fd, nconf); return (FALSE); } if (t_listen(fd, conn->conn_call) == -1) { nfslib_log_tli_error("t_listen", fd, nconf); (void) t_free((char *)conn->conn_call, T_CALL); free((char *)conn); return (FALSE); } if (conn->conn_call->udata.len > 0) { syslog(LOG_WARNING, "rejecting inbound connection(%s) with %d bytes of connect data", nconf->nc_proto, conn->conn_call->udata.len); conn->conn_call->udata.len = 0; (void) t_snddis(fd, conn->conn_call); (void) t_free((char *)conn->conn_call, T_CALL); free((char *)conn); return (FALSE); } if ((next_conn = *connp) != NULL) { next_conn->conn_prev->conn_next = conn; conn->conn_next = next_conn; conn->conn_prev = next_conn->conn_prev; next_conn->conn_prev = conn; } else { conn->conn_next = conn; conn->conn_prev = conn; *connp = conn; } return (TRUE); } static int discon_get(int fd, struct netconfig *nconf, struct conn_ind **connp) { struct conn_ind *conn; struct t_discon discon; discon.udata.buf = (char *)0; discon.udata.maxlen = 0; if (t_rcvdis(fd, &discon) == -1) { nfslib_log_tli_error("t_rcvdis", fd, nconf); return (-1); } conn = *connp; if (conn == NULL) return (0); do { if (conn->conn_call->sequence == discon.sequence) { if (conn->conn_next == conn) *connp = (struct conn_ind *)0; else { if (conn == *connp) { *connp = conn->conn_next; } conn->conn_next->conn_prev = conn->conn_prev; conn->conn_prev->conn_next = conn->conn_next; } free((char *)conn); break; } conn = conn->conn_next; } while (conn != *connp); return (0); } static void cots_listen_event(int fd, int conn_index) { struct t_call *call; struct conn_ind *conn; struct conn_ind *conn_head; int event; struct netconfig *nconf = &conn_polled[conn_index].nc; int new_fd; struct netbuf addrmask; int ret = 0; char *clnt; char *clnt_uaddr = NULL; struct nd_hostservlist *clnt_serv = NULL; conn_head = (struct conn_ind *)0; (void) conn_get(fd, nconf, &conn_head); while ((conn = conn_head) != NULL) { conn_head = conn->conn_next; if (conn_head == conn) conn_head = (struct conn_ind *)0; else { conn_head->conn_prev = conn->conn_prev; conn->conn_prev->conn_next = conn_head; } call = conn->conn_call; free((char *)conn); /* * If we have already accepted the maximum number of * connections allowed on the command line, then drop * the oldest connection (for any protocol) before * accepting the new connection. Unless explicitly * set on the command line, max_conns_allowed is -1. */ if (max_conns_allowed != -1 && num_conns >= max_conns_allowed) conn_close_oldest(); /* * Create a new transport endpoint for the same proto as * the listener. */ new_fd = nfslib_transport_open(nconf); if (new_fd == -1) { call->udata.len = 0; (void) t_snddis(fd, call); (void) t_free((char *)call, T_CALL); syslog(LOG_ERR, "Cannot establish transport over %s", nconf->nc_device); continue; } /* Bind to a generic address/port for the accepting stream. */ if (t_bind(new_fd, (struct t_bind *)NULL, (struct t_bind *)NULL) == -1) { nfslib_log_tli_error("t_bind", new_fd, nconf); call->udata.len = 0; (void) t_snddis(fd, call); (void) t_free((char *)call, T_CALL); (void) t_close(new_fd); continue; } while (t_accept(fd, new_fd, call) == -1) { if (t_errno != TLOOK) { #ifdef DEBUG nfslib_log_tli_error("t_accept", fd, nconf); #endif call->udata.len = 0; (void) t_snddis(fd, call); (void) t_free((char *)call, T_CALL); (void) t_close(new_fd); goto do_next_conn; } while (event = t_look(fd)) { switch (event) { case T_LISTEN: #ifdef DEBUG printf( "cots_listen_event(%s): T_LISTEN during accept processing\n", nconf->nc_proto); #endif (void) conn_get(fd, nconf, &conn_head); continue; case T_DISCONNECT: #ifdef DEBUG printf( "cots_listen_event(%s): T_DISCONNECT during accept processing\n", nconf->nc_proto); #endif (void) discon_get(fd, nconf, &conn_head); continue; default: syslog(LOG_ERR, "unexpected event 0x%x during accept processing (%s)", event, nconf->nc_proto); call->udata.len = 0; (void) t_snddis(fd, call); (void) t_free((char *)call, T_CALL); (void) t_close(new_fd); goto do_next_conn; } } } if (set_addrmask(new_fd, nconf, &addrmask) < 0) { (void) syslog(LOG_ERR, "Cannot set address mask for %s", nconf->nc_netid); return; } /* Tell KRPC about the new stream. */ if (Mysvc4 != NULL) ret = (*Mysvc4)(new_fd, &addrmask, nconf, NFS4_KRPC_START, &call->addr); else ret = (*Mysvc)(new_fd, addrmask, nconf); if (ret < 0) { if (errno != ENOTCONN) { syslog(LOG_ERR, "unable to register new connection: %m"); } else { /* * This is the only error that could be * caused by the client, so who was it? */ if (netdir_getbyaddr(nconf, &clnt_serv, &(call->addr)) == ND_OK && clnt_serv->h_cnt > 0) clnt = clnt_serv->h_hostservs->h_host; else clnt = clnt_uaddr = taddr2uaddr(nconf, &(call->addr)); /* * If we don't know who the client was, * remain silent. */ if (clnt) syslog(LOG_ERR, "unable to register new connection: client %s has dropped connection", clnt); if (clnt_serv) netdir_free(clnt_serv, ND_HOSTSERVLIST); if (clnt_uaddr) free(clnt_uaddr); } free(addrmask.buf); (void) t_snddis(new_fd, (struct t_call *)0); (void) t_free((char *)call, T_CALL); (void) t_close(new_fd); goto do_next_conn; } free(addrmask.buf); (void) t_free((char *)call, T_CALL); /* * Poll on the new descriptor so that we get disconnect * and orderly release indications. */ num_conns++; add_to_poll_list(new_fd, nconf); /* Reset nconf in case it has been moved. */ nconf = &conn_polled[conn_index].nc; do_next_conn:; } } static int do_poll_cots_action(int fd, int conn_index) { char buf[256]; int event; int i1; int flags; struct conn_entry *connent = &conn_polled[conn_index]; struct netconfig *nconf = &(connent->nc); const char *errorstr; while (event = t_look(fd)) { switch (event) { case T_LISTEN: #ifdef DEBUG printf("do_poll_cots_action(%s,%d): T_LISTEN event\n", nconf->nc_proto, fd); #endif cots_listen_event(fd, conn_index); break; case T_DATA: #ifdef DEBUG printf("do_poll_cots_action(%d,%s): T_DATA event\n", fd, nconf->nc_proto); #endif /* * Receive a private notification from CONS rpcmod. */ i1 = t_rcv(fd, buf, sizeof (buf), &flags); if (i1 == -1) { syslog(LOG_ERR, "t_rcv failed"); break; } if (i1 < sizeof (int)) break; i1 = BE32_TO_U32(buf); if (i1 == 1 || i1 == 2) { /* * This connection has been idle for too long, * so release it as politely as we can. If we * have already initiated an orderly release * and we get notified that the stream is * still idle, pull the plug. This prevents * hung connections from continuing to consume * resources. */ #ifdef DEBUG printf("do_poll_cots_action(%s,%d): ", nconf->nc_proto, fd); printf("initiating orderly release of idle connection\n"); #endif if (nconf->nc_semantics == NC_TPI_COTS || connent->closing != 0) { (void) t_snddis(fd, (struct t_call *)0); goto fdclose; } /* * For NC_TPI_COTS_ORD, the stream is closed * and removed from the poll list when the * T_ORDREL is received from the provider. We * don't wait for it here because it may take * a while for the transport to shut down. */ if (t_sndrel(fd) == -1) { syslog(LOG_ERR, "unable to send orderly release %m"); } connent->closing = 1; } else syslog(LOG_ERR, "unexpected event from CONS rpcmod %d", i1); break; case T_ORDREL: #ifdef DEBUG printf("do_poll_cots_action(%s,%d): T_ORDREL event\n", nconf->nc_proto, fd); #endif /* Perform an orderly release. */ if (t_rcvrel(fd) == 0) { /* T_ORDREL on listen fd's should be ignored */ if (!is_listen_fd_index(conn_index)) { (void) t_sndrel(fd); goto fdclose; } break; } else if (t_errno == TLOOK) { break; } else { nfslib_log_tli_error("t_rcvrel", fd, nconf); /* * check to make sure we do not close * listen fd */ if (is_listen_fd_index(conn_index)) break; else goto fdclose; } case T_DISCONNECT: #ifdef DEBUG printf("do_poll_cots_action(%s,%d): T_DISCONNECT event\n", nconf->nc_proto, fd); #endif if (t_rcvdis(fd, (struct t_discon *)NULL) == -1) nfslib_log_tli_error("t_rcvdis", fd, nconf); /* * T_DISCONNECT on listen fd's should be ignored. */ if (is_listen_fd_index(conn_index)) break; else goto fdclose; case T_ERROR: default: if (event == T_ERROR || t_errno == TSYSERR) { if ((errorstr = strerror(errno)) == NULL) { (void) sprintf(buf, "Unknown error num %d", errno); errorstr = (const char *) buf; } } else if (event == -1) errorstr = t_strerror(t_errno); else errorstr = ""; syslog(LOG_ERR, "unexpected TLI event (0x%x) on " "connection-oriented transport(%s,%d):%s", event, nconf->nc_proto, fd, errorstr); fdclose: num_conns--; remove_from_poll_list(fd); (void) t_close(fd); return (0); } } return (0); } static char * serv_name_to_port_name(char *name) { /* * Map service names (used primarily in logging) to * RPC port names (used by netdir_*() routines). */ if (strcmp(name, "NFS") == 0) { return ("nfs"); } else if (strcmp(name, "NLM") == 0) { return ("lockd"); } else if (strcmp(name, "NFS4_CALLBACK") == 0) { return ("nfs4_callback"); } return ("unrecognized"); } static int bind_to_provider(char *provider, char *serv, struct netbuf **addr, struct netconfig **retnconf) { struct netconfig *nconf; NCONF_HANDLE *nc; struct nd_hostserv hs; hs.h_host = HOST_SELF; hs.h_serv = serv_name_to_port_name(serv); if ((nc = setnetconfig()) == (NCONF_HANDLE *)NULL) { syslog(LOG_ERR, "setnetconfig failed: %m"); return (-1); } while (nconf = getnetconfig(nc)) { if (OK_TPI_TYPE(nconf) && strcmp(nconf->nc_device, provider) == 0) { *retnconf = nconf; return (nfslib_bindit(nconf, addr, &hs, listen_backlog)); } } (void) endnetconfig(nc); syslog(LOG_ERR, "couldn't find netconfig entry for provider %s", provider); return (-1); } static int bind_to_proto(NETSELDECL(proto), char *serv, struct netbuf **addr, struct netconfig **retnconf) { struct netconfig *nconf; NCONF_HANDLE *nc = NULL; struct nd_hostserv hs; hs.h_host = HOST_SELF; hs.h_serv = serv_name_to_port_name(serv); if ((nc = setnetconfig()) == (NCONF_HANDLE *)NULL) { syslog(LOG_ERR, "setnetconfig failed: %m"); return (-1); } while (nconf = getnetconfig(nc)) { if (OK_TPI_TYPE(nconf) && NETSELEQ(nconf->nc_proto, proto)) { *retnconf = nconf; return (nfslib_bindit(nconf, addr, &hs, listen_backlog)); } } (void) endnetconfig(nc); syslog(LOG_ERR, "couldn't find netconfig entry for protocol %s", proto); return (-1); } #include /* * Create an address mask appropriate for the transport. * The mask is used to obtain the host-specific part of * a network address when comparing addresses. * For an internet address the host-specific part is just * the 32 bit IP address and this part of the mask is set * to all-ones. The port number part of the mask is zeroes. */ static int set_addrmask(fd, nconf, mask) struct netconfig *nconf; struct netbuf *mask; { struct t_info info; /* * Find the size of the address we need to mask. */ if (t_getinfo(fd, &info) < 0) { t_error("t_getinfo"); return (-1); } mask->len = mask->maxlen = info.addr; if (info.addr <= 0) { /* * loopback devices have infinite addr size * (it is identified by -1 in addr field of t_info structure), * so don't build the netmask for them. It's a special case * that should be handled properly. */ if ((info.addr == -1) && (0 == strcmp(nconf->nc_protofmly, NC_LOOPBACK))) { memset(mask, 0, sizeof (*mask)); return (0); } syslog(LOG_ERR, "set_addrmask: address size: %ld", info.addr); return (-1); } mask->buf = (char *)malloc(mask->len); if (mask->buf == NULL) { syslog(LOG_ERR, "set_addrmask: no memory"); return (-1); } (void) memset(mask->buf, 0, mask->len); /* reset all mask bits */ if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { /* * Set the mask so that the port is ignored. */ /* LINTED pointer alignment */ ((struct sockaddr_in *)mask->buf)->sin_addr.s_addr = (ulong_t)~0; /* LINTED pointer alignment */ ((struct sockaddr_in *)mask->buf)->sin_family = (ushort_t)~0; } else if (strcmp(nconf->nc_protofmly, NC_INET6) == 0) { /* LINTED pointer alignment */ (void) memset(&((struct sockaddr_in6 *)mask->buf)->sin6_addr, (uchar_t)~0, sizeof (struct in6_addr)); /* LINTED pointer alignment */ ((struct sockaddr_in6 *)mask->buf)->sin6_family = (ushort_t)~0; } else { /* * Set all mask bits. */ (void) memset(mask->buf, 0xFF, mask->len); } return (0); } /* * For listen fd's index is always less than end_listen_fds. * end_listen_fds is defined externally in the daemon that uses this library. * It's value is equal to the number of open file descriptors after the * last listen end point was opened but before any connection was accepted. */ static int is_listen_fd_index(int index) { return (index < end_listen_fds); }