/* Unix SMB/CIFS implementation. Samba utility functions Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Tim Potter 2000-2001 Copyright (C) Jeremy Allison 1992-2007 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "system/filesys.h" #include "memcache.h" #include "../lib/async_req/async_sock.h" #include "../lib/util/select.h" #include "lib/socket/interfaces.h" #include "../lib/util/tevent_unix.h" #include "../lib/util/tevent_ntstatus.h" #include "../lib/tsocket/tsocket.h" const char *client_name(int fd) { return get_peer_name(fd,false); } const char *client_addr(int fd, char *addr, size_t addrlen) { return get_peer_addr(fd,addr,addrlen); } #if 0 /* Not currently used. JRA. */ int client_socket_port(int fd) { return get_socket_port(fd); } #endif /**************************************************************************** Determine if a file descriptor is in fact a socket. ****************************************************************************/ bool is_a_socket(int fd) { int v; socklen_t l; l = sizeof(int); return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); } /**************************************************************************** Read from a socket. ****************************************************************************/ ssize_t read_udp_v4_socket(int fd, char *buf, size_t len, struct sockaddr_storage *psa) { ssize_t ret; socklen_t socklen = sizeof(*psa); struct sockaddr_in *si = (struct sockaddr_in *)psa; memset((char *)psa,'\0',socklen); ret = (ssize_t)sys_recvfrom(fd,buf,len,0, (struct sockaddr *)psa,&socklen); if (ret <= 0) { /* Don't print a low debug error for a non-blocking socket. */ if (errno == EAGAIN) { DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n")); } else { DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n", strerror(errno))); } return 0; } if (psa->ss_family != AF_INET) { DEBUG(2,("read_udp_v4_socket: invalid address family %d " "(not IPv4)\n", (int)psa->ss_family)); return 0; } DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n", inet_ntoa(si->sin_addr), si->sin_port, (unsigned long)ret)); return ret; } /**************************************************************************** Read data from a file descriptor with a timout in msec. mincount = if timeout, minimum to read before returning maxcount = number to be read. time_out = timeout in milliseconds NB. This can be called with a non-socket fd, don't change sys_read() to sys_recv() or other socket call. ****************************************************************************/ NTSTATUS read_fd_with_timeout(int fd, char *buf, size_t mincnt, size_t maxcnt, unsigned int time_out, size_t *size_ret) { int pollrtn; ssize_t readret; size_t nread = 0; /* just checking .... */ if (maxcnt <= 0) return NT_STATUS_OK; /* Blocking read */ if (time_out == 0) { if (mincnt == 0) { mincnt = maxcnt; } while (nread < mincnt) { readret = sys_read(fd, buf + nread, maxcnt - nread); if (readret == 0) { DEBUG(5,("read_fd_with_timeout: " "blocking read. EOF from client.\n")); return NT_STATUS_END_OF_FILE; } if (readret == -1) { return map_nt_error_from_unix(errno); } nread += readret; } goto done; } /* Most difficult - timeout read */ /* If this is ever called on a disk file and mincnt is greater then the filesize then system performance will suffer severely as select always returns true on disk files */ for (nread=0; nread < mincnt; ) { int revents; pollrtn = poll_intr_one_fd(fd, POLLIN|POLLHUP, time_out, &revents); /* Check if error */ if (pollrtn == -1) { return map_nt_error_from_unix(errno); } /* Did we timeout ? */ if ((pollrtn == 0) || ((revents & (POLLIN|POLLHUP|POLLERR)) == 0)) { DEBUG(10,("read_fd_with_timeout: timeout read. " "select timed out.\n")); return NT_STATUS_IO_TIMEOUT; } readret = sys_read(fd, buf+nread, maxcnt-nread); if (readret == 0) { /* we got EOF on the file descriptor */ DEBUG(5,("read_fd_with_timeout: timeout read. " "EOF from client.\n")); return NT_STATUS_END_OF_FILE; } if (readret == -1) { return map_nt_error_from_unix(errno); } nread += readret; } done: /* Return the number we got */ if (size_ret) { *size_ret = nread; } return NT_STATUS_OK; } /**************************************************************************** Read data from an fd, reading exactly N bytes. NB. This can be called with a non-socket fd, don't add dependencies on socket calls. ****************************************************************************/ NTSTATUS read_data(int fd, char *buffer, size_t N) { return read_fd_with_timeout(fd, buffer, N, N, 0, NULL); } /**************************************************************************** Write all data from an iov array NB. This can be called with a non-socket fd, don't add dependencies on socket calls. ****************************************************************************/ ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt) { int i; size_t to_send; ssize_t thistime; size_t sent; struct iovec *iov_copy, *iov; to_send = 0; for (i=0; i<iovcnt; i++) { to_send += orig_iov[i].iov_len; } thistime = sys_writev(fd, orig_iov, iovcnt); if ((thistime <= 0) || (thistime == to_send)) { return thistime; } sent = thistime; /* * We could not send everything in one call. Make a copy of iov that * we can mess with. We keep a copy of the array start in iov_copy for * the TALLOC_FREE, because we're going to modify iov later on, * discarding elements. */ iov_copy = (struct iovec *)talloc_memdup( talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt); if (iov_copy == NULL) { errno = ENOMEM; return -1; } iov = iov_copy; while (sent < to_send) { /* * We have to discard "thistime" bytes from the beginning * iov array, "thistime" contains the number of bytes sent * via writev last. */ while (thistime > 0) { if (thistime < iov[0].iov_len) { char *new_base = (char *)iov[0].iov_base + thistime; iov[0].iov_base = (void *)new_base; iov[0].iov_len -= thistime; break; } thistime -= iov[0].iov_len; iov += 1; iovcnt -= 1; } thistime = sys_writev(fd, iov, iovcnt); if (thistime <= 0) { break; } sent += thistime; } TALLOC_FREE(iov_copy); return sent; } /**************************************************************************** Write data to a fd. NB. This can be called with a non-socket fd, don't add dependencies on socket calls. ****************************************************************************/ ssize_t write_data(int fd, const char *buffer, size_t N) { struct iovec iov; iov.iov_base = discard_const_p(void, buffer); iov.iov_len = N; return write_data_iov(fd, &iov, 1); } /**************************************************************************** Send a keepalive packet (rfc1002). ****************************************************************************/ bool send_keepalive(int client) { unsigned char buf[4]; buf[0] = NBSSkeepalive; buf[1] = buf[2] = buf[3] = 0; return(write_data(client,(char *)buf,4) == 4); } /**************************************************************************** Read 4 bytes of a smb packet and return the smb length of the packet. Store the result in the buffer. This version of the function will return a length of zero on receiving a keepalive packet. Timeout is in milliseconds. ****************************************************************************/ NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf, unsigned int timeout, size_t *len) { int msg_type; NTSTATUS status; status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL); if (!NT_STATUS_IS_OK(status)) { return status; } *len = smb_len(inbuf); msg_type = CVAL(inbuf,0); if (msg_type == NBSSkeepalive) { DEBUG(5,("Got keepalive packet\n")); } DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len))); return NT_STATUS_OK; } /**************************************************************************** Read an smb from a fd. The timeout is in milliseconds. This function will return on receipt of a session keepalive packet. maxlen is the max number of bytes to return, not including the 4 byte length. If zero it means buflen limit. Doesn't check the MAC on signed packets. ****************************************************************************/ NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout, size_t maxlen, size_t *p_len) { size_t len; NTSTATUS status; status = read_smb_length_return_keepalive(fd,buffer,timeout,&len); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("read_fd_with_timeout failed, read " "error = %s.\n", nt_errstr(status))); return status; } if (len > buflen) { DEBUG(0,("Invalid packet length! (%lu bytes).\n", (unsigned long)len)); return NT_STATUS_INVALID_PARAMETER; } if(len > 0) { if (maxlen) { len = MIN(len,maxlen); } status = read_fd_with_timeout( fd, buffer+4, len, len, timeout, &len); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("read_fd_with_timeout failed, read error = " "%s.\n", nt_errstr(status))); return status; } /* not all of samba3 properly checks for packet-termination * of strings. This ensures that we don't run off into * empty space. */ SSVAL(buffer+4,len, 0); } *p_len = len; return NT_STATUS_OK; } /**************************************************************************** Open a socket of the specified type, port, and address for incoming data. ****************************************************************************/ int open_socket_in(int type, uint16_t port, int dlevel, const struct sockaddr_storage *psock, bool rebind) { struct sockaddr_storage sock; int res; socklen_t slen = sizeof(struct sockaddr_in); sock = *psock; #if defined(HAVE_IPV6) if (sock.ss_family == AF_INET6) { ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port); slen = sizeof(struct sockaddr_in6); } #endif if (sock.ss_family == AF_INET) { ((struct sockaddr_in *)&sock)->sin_port = htons(port); } res = socket(sock.ss_family, type, 0 ); if( res == -1 ) { if( DEBUGLVL(0) ) { dbgtext( "open_socket_in(): socket() call failed: " ); dbgtext( "%s\n", strerror( errno ) ); } return -1; } /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */ { int val = rebind ? 1 : 0; if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR, (char *)&val,sizeof(val)) == -1 ) { if( DEBUGLVL( dlevel ) ) { dbgtext( "open_socket_in(): setsockopt: " ); dbgtext( "SO_REUSEADDR = %s ", val?"true":"false" ); dbgtext( "on port %d failed ", port ); dbgtext( "with error = %s\n", strerror(errno) ); } } #ifdef SO_REUSEPORT if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT, (char *)&val,sizeof(val)) == -1 ) { if( DEBUGLVL( dlevel ) ) { dbgtext( "open_socket_in(): setsockopt: "); dbgtext( "SO_REUSEPORT = %s ", val?"true":"false"); dbgtext( "on port %d failed ", port); dbgtext( "with error = %s\n", strerror(errno)); } } #endif /* SO_REUSEPORT */ } #ifdef HAVE_IPV6 /* * As IPV6_V6ONLY is the default on some systems, * we better try to be consistent and always use it. * * This also avoids using IPv4 via AF_INET6 sockets * and makes sure %I never resolves to a '::ffff:192.168.0.1' * string. */ if (sock.ss_family == AF_INET6) { int val = 1; int ret; ret = setsockopt(res, IPPROTO_IPV6, IPV6_V6ONLY, (const void *)&val, sizeof(val)); if (ret == -1) { if(DEBUGLVL(0)) { dbgtext("open_socket_in(): IPV6_ONLY failed: "); dbgtext("%s\n", strerror(errno)); } close(res); return -1; } } #endif /* now we've got a socket - we need to bind it */ if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) { if( DEBUGLVL(dlevel) && (port == SMB_PORT1 || port == SMB_PORT2 || port == NMB_PORT) ) { char addr[INET6_ADDRSTRLEN]; print_sockaddr(addr, sizeof(addr), &sock); dbgtext( "bind failed on port %d ", port); dbgtext( "socket_addr = %s.\n", addr); dbgtext( "Error = %s\n", strerror(errno)); } close(res); return -1; } DEBUG( 10, ( "bind succeeded on port %d\n", port ) ); return( res ); } struct open_socket_out_state { int fd; struct event_context *ev; struct sockaddr_storage ss; socklen_t salen; uint16_t port; int wait_usec; }; static void open_socket_out_connected(struct tevent_req *subreq); static int open_socket_out_state_destructor(struct open_socket_out_state *s) { if (s->fd != -1) { close(s->fd); } return 0; } /**************************************************************************** Create an outgoing socket. timeout is in milliseconds. **************************************************************************/ struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx, struct event_context *ev, const struct sockaddr_storage *pss, uint16_t port, int timeout) { char addr[INET6_ADDRSTRLEN]; struct tevent_req *result, *subreq; struct open_socket_out_state *state; NTSTATUS status; result = tevent_req_create(mem_ctx, &state, struct open_socket_out_state); if (result == NULL) { return NULL; } state->ev = ev; state->ss = *pss; state->port = port; state->wait_usec = 10000; state->salen = -1; state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0); if (state->fd == -1) { status = map_nt_error_from_unix(errno); goto post_status; } talloc_set_destructor(state, open_socket_out_state_destructor); if (!tevent_req_set_endtime( result, ev, timeval_current_ofs_msec(timeout))) { goto fail; } #if defined(HAVE_IPV6) if (pss->ss_family == AF_INET6) { struct sockaddr_in6 *psa6; psa6 = (struct sockaddr_in6 *)&state->ss; psa6->sin6_port = htons(port); if (psa6->sin6_scope_id == 0 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) { setup_linklocal_scope_id( (struct sockaddr *)&(state->ss)); } state->salen = sizeof(struct sockaddr_in6); } #endif if (pss->ss_family == AF_INET) { struct sockaddr_in *psa; psa = (struct sockaddr_in *)&state->ss; psa->sin_port = htons(port); state->salen = sizeof(struct sockaddr_in); } if (pss->ss_family == AF_UNIX) { state->salen = sizeof(struct sockaddr_un); } print_sockaddr(addr, sizeof(addr), &state->ss); DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port)); subreq = async_connect_send(state, state->ev, state->fd, (struct sockaddr *)&state->ss, state->salen); if ((subreq == NULL) || !tevent_req_set_endtime( subreq, state->ev, timeval_current_ofs(0, state->wait_usec))) { goto fail; } tevent_req_set_callback(subreq, open_socket_out_connected, result); return result; post_status: tevent_req_nterror(result, status); return tevent_req_post(result, ev); fail: TALLOC_FREE(result); return NULL; } static void open_socket_out_connected(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req); struct open_socket_out_state *state = tevent_req_data(req, struct open_socket_out_state); int ret; int sys_errno; ret = async_connect_recv(subreq, &sys_errno); TALLOC_FREE(subreq); if (ret == 0) { tevent_req_done(req); return; } if ( #ifdef ETIMEDOUT (sys_errno == ETIMEDOUT) || #endif (sys_errno == EINPROGRESS) || (sys_errno == EALREADY) || (sys_errno == EAGAIN)) { /* * retry */ if (state->wait_usec < 250000) { state->wait_usec *= 1.5; } subreq = async_connect_send(state, state->ev, state->fd, (struct sockaddr *)&state->ss, state->salen); if (tevent_req_nomem(subreq, req)) { return; } if (!tevent_req_set_endtime( subreq, state->ev, timeval_current_ofs_usec(state->wait_usec))) { tevent_req_nterror(req, NT_STATUS_NO_MEMORY); return; } tevent_req_set_callback(subreq, open_socket_out_connected, req); return; } #ifdef EISCONN if (sys_errno == EISCONN) { tevent_req_done(req); return; } #endif /* real error */ tevent_req_nterror(req, map_nt_error_from_unix(sys_errno)); } NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd) { struct open_socket_out_state *state = tevent_req_data(req, struct open_socket_out_state); NTSTATUS status; if (tevent_req_is_nterror(req, &status)) { return status; } *pfd = state->fd; state->fd = -1; return NT_STATUS_OK; } /** * @brief open a socket * * @param pss a struct sockaddr_storage defining the address to connect to * @param port to connect to * @param timeout in MILLISECONDS * @param pfd file descriptor returned * * @return NTSTATUS code */ NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port, int timeout, int *pfd) { TALLOC_CTX *frame = talloc_stackframe(); struct event_context *ev; struct tevent_req *req; NTSTATUS status = NT_STATUS_NO_MEMORY; ev = event_context_init(frame); if (ev == NULL) { goto fail; } req = open_socket_out_send(frame, ev, pss, port, timeout); if (req == NULL) { goto fail; } if (!tevent_req_poll(req, ev)) { status = NT_STATUS_INTERNAL_ERROR; goto fail; } status = open_socket_out_recv(req, pfd); fail: TALLOC_FREE(frame); return status; } struct open_socket_out_defer_state { struct event_context *ev; struct sockaddr_storage ss; uint16_t port; int timeout; int fd; }; static void open_socket_out_defer_waited(struct tevent_req *subreq); static void open_socket_out_defer_connected(struct tevent_req *subreq); struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx, struct event_context *ev, struct timeval wait_time, const struct sockaddr_storage *pss, uint16_t port, int timeout) { struct tevent_req *req, *subreq; struct open_socket_out_defer_state *state; req = tevent_req_create(mem_ctx, &state, struct open_socket_out_defer_state); if (req == NULL) { return NULL; } state->ev = ev; state->ss = *pss; state->port = port; state->timeout = timeout; subreq = tevent_wakeup_send( state, ev, timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec)); if (subreq == NULL) { goto fail; } tevent_req_set_callback(subreq, open_socket_out_defer_waited, req); return req; fail: TALLOC_FREE(req); return NULL; } static void open_socket_out_defer_waited(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data( subreq, struct tevent_req); struct open_socket_out_defer_state *state = tevent_req_data( req, struct open_socket_out_defer_state); bool ret; ret = tevent_wakeup_recv(subreq); TALLOC_FREE(subreq); if (!ret) { tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR); return; } subreq = open_socket_out_send(state, state->ev, &state->ss, state->port, state->timeout); if (tevent_req_nomem(subreq, req)) { return; } tevent_req_set_callback(subreq, open_socket_out_defer_connected, req); } static void open_socket_out_defer_connected(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data( subreq, struct tevent_req); struct open_socket_out_defer_state *state = tevent_req_data( req, struct open_socket_out_defer_state); NTSTATUS status; status = open_socket_out_recv(subreq, &state->fd); TALLOC_FREE(subreq); if (!NT_STATUS_IS_OK(status)) { tevent_req_nterror(req, status); return; } tevent_req_done(req); } NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd) { struct open_socket_out_defer_state *state = tevent_req_data( req, struct open_socket_out_defer_state); NTSTATUS status; if (tevent_req_is_nterror(req, &status)) { return status; } *pfd = state->fd; state->fd = -1; return NT_STATUS_OK; } /**************************************************************************** Open a connected UDP socket to host on port **************************************************************************/ int open_udp_socket(const char *host, int port) { struct sockaddr_storage ss; int res; if (!interpret_string_addr(&ss, host, 0)) { DEBUG(10,("open_udp_socket: can't resolve name %s\n", host)); return -1; } res = socket(ss.ss_family, SOCK_DGRAM, 0); if (res == -1) { return -1; } #if defined(HAVE_IPV6) if (ss.ss_family == AF_INET6) { struct sockaddr_in6 *psa6; psa6 = (struct sockaddr_in6 *)&ss; psa6->sin6_port = htons(port); if (psa6->sin6_scope_id == 0 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) { setup_linklocal_scope_id( (struct sockaddr *)&ss); } } #endif if (ss.ss_family == AF_INET) { struct sockaddr_in *psa; psa = (struct sockaddr_in *)&ss; psa->sin_port = htons(port); } if (sys_connect(res,(struct sockaddr *)&ss)) { close(res); return -1; } return res; } /******************************************************************* Return the IP addr of the remote end of a socket as a string. Optionally return the struct sockaddr_storage. ******************************************************************/ static const char *get_peer_addr_internal(int fd, char *addr_buf, size_t addr_buf_len, struct sockaddr *pss, socklen_t *plength) { struct sockaddr_storage ss; socklen_t length = sizeof(ss); strlcpy(addr_buf,"0.0.0.0",addr_buf_len); if (fd == -1) { return addr_buf; } if (pss == NULL) { pss = (struct sockaddr *)&ss; plength = &length; } if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) { int level = (errno == ENOTCONN) ? 2 : 0; DEBUG(level, ("getpeername failed. Error was %s\n", strerror(errno))); return addr_buf; } print_sockaddr_len(addr_buf, addr_buf_len, pss, *plength); return addr_buf; } /******************************************************************* Matchname - determine if host name matches IP address. Used to confirm a hostname lookup to prevent spoof attacks. ******************************************************************/ static bool matchname(const char *remotehost, const struct sockaddr *pss, socklen_t len) { struct addrinfo *res = NULL; struct addrinfo *ailist = NULL; char addr_buf[INET6_ADDRSTRLEN]; bool ret = interpret_string_addr_internal(&ailist, remotehost, AI_ADDRCONFIG|AI_CANONNAME); if (!ret || ailist == NULL) { DEBUG(3,("matchname: getaddrinfo failed for " "name %s [%s]\n", remotehost, gai_strerror(ret) )); return false; } /* * Make sure that getaddrinfo() returns the "correct" host name. */ if (ailist->ai_canonname == NULL || (!strequal(remotehost, ailist->ai_canonname) && !strequal(remotehost, "localhost"))) { DEBUG(0,("matchname: host name/name mismatch: %s != %s\n", remotehost, ailist->ai_canonname ? ailist->ai_canonname : "(NULL)")); freeaddrinfo(ailist); return false; } /* Look up the host address in the address list we just got. */ for (res = ailist; res; res = res->ai_next) { if (!res->ai_addr) { continue; } if (sockaddr_equal((const struct sockaddr *)res->ai_addr, (const struct sockaddr *)pss)) { freeaddrinfo(ailist); return true; } } /* * The host name does not map to the original host address. Perhaps * someone has compromised a name server. More likely someone botched * it, but that could be dangerous, too. */ DEBUG(0,("matchname: host name/address mismatch: %s != %s\n", print_sockaddr_len(addr_buf, sizeof(addr_buf), pss, len), ailist->ai_canonname ? ailist->ai_canonname : "(NULL)")); if (ailist) { freeaddrinfo(ailist); } return false; } /******************************************************************* Deal with the singleton cache. ******************************************************************/ struct name_addr_pair { struct sockaddr_storage ss; const char *name; }; /******************************************************************* Lookup a name/addr pair. Returns memory allocated from memcache. ******************************************************************/ static bool lookup_nc(struct name_addr_pair *nc) { DATA_BLOB tmp; ZERO_STRUCTP(nc); if (!memcache_lookup( NULL, SINGLETON_CACHE, data_blob_string_const_null("get_peer_name"), &tmp)) { return false; } memcpy(&nc->ss, tmp.data, sizeof(nc->ss)); nc->name = (const char *)tmp.data + sizeof(nc->ss); return true; } /******************************************************************* Save a name/addr pair. ******************************************************************/ static void store_nc(const struct name_addr_pair *nc) { DATA_BLOB tmp; size_t namelen = strlen(nc->name); tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1); if (!tmp.data) { return; } memcpy(tmp.data, &nc->ss, sizeof(nc->ss)); memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1); memcache_add(NULL, SINGLETON_CACHE, data_blob_string_const_null("get_peer_name"), tmp); data_blob_free(&tmp); } /******************************************************************* Return the DNS name of the remote end of a socket. ******************************************************************/ const char *get_peer_name(int fd, bool force_lookup) { struct name_addr_pair nc; char addr_buf[INET6_ADDRSTRLEN]; struct sockaddr_storage ss; socklen_t length = sizeof(ss); const char *p; int ret; char name_buf[MAX_DNS_NAME_LENGTH]; char tmp_name[MAX_DNS_NAME_LENGTH]; /* reverse lookups can be *very* expensive, and in many situations won't work because many networks don't link dhcp with dns. To avoid the delay we avoid the lookup if possible */ if (!lp_hostname_lookups() && (force_lookup == false)) { length = sizeof(nc.ss); nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&nc.ss, &length); store_nc(&nc); lookup_nc(&nc); return nc.name ? nc.name : "UNKNOWN"; } lookup_nc(&nc); memset(&ss, '\0', sizeof(ss)); p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length); /* it might be the same as the last one - save some DNS work */ if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) { return nc.name ? nc.name : "UNKNOWN"; } /* Not the same. We need to lookup. */ if (fd == -1) { return "UNKNOWN"; } /* Look up the remote host name. */ ret = sys_getnameinfo((struct sockaddr *)&ss, length, name_buf, sizeof(name_buf), NULL, 0, 0); if (ret) { DEBUG(1,("get_peer_name: getnameinfo failed " "for %s with error %s\n", p, gai_strerror(ret))); strlcpy(name_buf, p, sizeof(name_buf)); } else { if (!matchname(name_buf, (struct sockaddr *)&ss, length)) { DEBUG(0,("Matchname failed on %s %s\n",name_buf,p)); strlcpy(name_buf,"UNKNOWN",sizeof(name_buf)); } } strlcpy(tmp_name, name_buf, sizeof(tmp_name)); alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf)); if (strstr(name_buf,"..")) { strlcpy(name_buf, "UNKNOWN", sizeof(name_buf)); } nc.name = name_buf; nc.ss = ss; store_nc(&nc); lookup_nc(&nc); return nc.name ? nc.name : "UNKNOWN"; } /******************************************************************* Return the IP addr of the remote end of a socket as a string. ******************************************************************/ const char *get_peer_addr(int fd, char *addr, size_t addr_len) { return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL); } int get_remote_hostname(const struct tsocket_address *remote_address, char **name, TALLOC_CTX *mem_ctx) { char name_buf[MAX_DNS_NAME_LENGTH]; char tmp_name[MAX_DNS_NAME_LENGTH]; struct name_addr_pair nc; struct sockaddr_storage ss; ssize_t len; int rc; if (!lp_hostname_lookups()) { nc.name = tsocket_address_inet_addr_string(remote_address, mem_ctx); if (nc.name == NULL) { return -1; } len = tsocket_address_bsd_sockaddr(remote_address, (struct sockaddr *) &nc.ss, sizeof(struct sockaddr_storage)); if (len < 0) { return -1; } store_nc(&nc); lookup_nc(&nc); if (nc.name == NULL) { *name = talloc_strdup(mem_ctx, "UNKNOWN"); } else { *name = talloc_strdup(mem_ctx, nc.name); } return 0; } lookup_nc(&nc); ZERO_STRUCT(ss); len = tsocket_address_bsd_sockaddr(remote_address, (struct sockaddr *) &ss, sizeof(struct sockaddr_storage)); if (len < 0) { return -1; } /* it might be the same as the last one - save some DNS work */ if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) { if (nc.name == NULL) { *name = talloc_strdup(mem_ctx, "UNKNOWN"); } else { *name = talloc_strdup(mem_ctx, nc.name); } return 0; } /* Look up the remote host name. */ rc = sys_getnameinfo((struct sockaddr *) &ss, len, name_buf, sizeof(name_buf), NULL, 0, 0); if (rc < 0) { char *p; p = tsocket_address_inet_addr_string(remote_address, mem_ctx); if (p == NULL) { return -1; } DEBUG(1,("getnameinfo failed for %s with error %s\n", p, gai_strerror(rc))); strlcpy(name_buf, p, sizeof(name_buf)); TALLOC_FREE(p); } else { if (!matchname(name_buf, (struct sockaddr *)&ss, len)) { DEBUG(0,("matchname failed on %s\n", name_buf)); strlcpy(name_buf, "UNKNOWN", sizeof(name_buf)); } } strlcpy(tmp_name, name_buf, sizeof(tmp_name)); alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf)); if (strstr(name_buf,"..")) { strlcpy(name_buf, "UNKNOWN", sizeof(name_buf)); } nc.name = name_buf; nc.ss = ss; store_nc(&nc); lookup_nc(&nc); if (nc.name == NULL) { *name = talloc_strdup(mem_ctx, "UNKOWN"); } else { *name = talloc_strdup(mem_ctx, nc.name); } return 0; } /******************************************************************* Create protected unix domain socket. Some unixes cannot set permissions on a ux-dom-sock, so we have to make sure that the directory contains the protection permissions instead. ******************************************************************/ int create_pipe_sock(const char *socket_dir, const char *socket_name, mode_t dir_perms) { #ifdef HAVE_UNIXSOCKET struct sockaddr_un sunaddr; struct stat st; int sock; mode_t old_umask; char *path = NULL; old_umask = umask(0); /* Create the socket directory or reuse the existing one */ if (lstat(socket_dir, &st) == -1) { if (errno == ENOENT) { /* Create directory */ if (mkdir(socket_dir, dir_perms) == -1) { DEBUG(0, ("error creating socket directory " "%s: %s\n", socket_dir, strerror(errno))); goto out_umask; } } else { DEBUG(0, ("lstat failed on socket directory %s: %s\n", socket_dir, strerror(errno))); goto out_umask; } } else { /* Check ownership and permission on existing directory */ if (!S_ISDIR(st.st_mode)) { DEBUG(0, ("socket directory '%s' isn't a directory\n", socket_dir)); goto out_umask; } if (st.st_uid != sec_initial_uid()) { DEBUG(0, ("invalid ownership on directory " "'%s'\n", socket_dir)); umask(old_umask); goto out_umask; } if ((st.st_mode & 0777) != dir_perms) { DEBUG(0, ("invalid permissions on directory " "'%s': has 0%o should be 0%o\n", socket_dir, (st.st_mode & 0777), dir_perms)); umask(old_umask); goto out_umask; } } /* Create the socket file */ sock = socket(AF_UNIX, SOCK_STREAM, 0); if (sock == -1) { DEBUG(0, ("create_pipe_sock: socket error %s\n", strerror(errno) )); goto out_close; } if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) { goto out_close; } unlink(path); memset(&sunaddr, 0, sizeof(sunaddr)); sunaddr.sun_family = AF_UNIX; strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)); if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { DEBUG(0, ("bind failed on pipe socket %s: %s\n", path, strerror(errno))); goto out_close; } SAFE_FREE(path); umask(old_umask); return sock; out_close: SAFE_FREE(path); if (sock != -1) close(sock); out_umask: umask(old_umask); return -1; #else DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n")); return -1; #endif /* HAVE_UNIXSOCKET */ } /**************************************************************************** Get my own canonical name, including domain. ****************************************************************************/ const char *get_mydnsfullname(void) { struct addrinfo *res = NULL; char my_hostname[HOST_NAME_MAX]; bool ret; DATA_BLOB tmp; if (memcache_lookup(NULL, SINGLETON_CACHE, data_blob_string_const_null("get_mydnsfullname"), &tmp)) { SMB_ASSERT(tmp.length > 0); return (const char *)tmp.data; } /* get my host name */ if (gethostname(my_hostname, sizeof(my_hostname)) == -1) { DEBUG(0,("get_mydnsfullname: gethostname failed\n")); return NULL; } /* Ensure null termination. */ my_hostname[sizeof(my_hostname)-1] = '\0'; ret = interpret_string_addr_internal(&res, my_hostname, AI_ADDRCONFIG|AI_CANONNAME); if (!ret || res == NULL) { DEBUG(3,("get_mydnsfullname: getaddrinfo failed for " "name %s [%s]\n", my_hostname, gai_strerror(ret) )); return NULL; } /* * Make sure that getaddrinfo() returns the "correct" host name. */ if (res->ai_canonname == NULL) { DEBUG(3,("get_mydnsfullname: failed to get " "canonical name for %s\n", my_hostname)); freeaddrinfo(res); return NULL; } /* This copies the data, so we must do a lookup * afterwards to find the value to return. */ memcache_add(NULL, SINGLETON_CACHE, data_blob_string_const_null("get_mydnsfullname"), data_blob_string_const_null(res->ai_canonname)); if (!memcache_lookup(NULL, SINGLETON_CACHE, data_blob_string_const_null("get_mydnsfullname"), &tmp)) { tmp = data_blob_talloc(talloc_tos(), res->ai_canonname, strlen(res->ai_canonname) + 1); } freeaddrinfo(res); return (const char *)tmp.data; } /************************************************************ Is this my ip address ? ************************************************************/ static bool is_my_ipaddr(const char *ipaddr_str) { struct sockaddr_storage ss; struct iface_struct *nics; int i, n; if (!interpret_string_addr(&ss, ipaddr_str, AI_NUMERICHOST)) { return false; } if (is_zero_addr(&ss)) { return false; } if (ismyaddr((struct sockaddr *)&ss) || is_loopback_addr((struct sockaddr *)&ss)) { return true; } n = get_interfaces(talloc_tos(), &nics); for (i=0; i<n; i++) { if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) { TALLOC_FREE(nics); return true; } } TALLOC_FREE(nics); return false; } /************************************************************ Is this my name ? ************************************************************/ bool is_myname_or_ipaddr(const char *s) { TALLOC_CTX *ctx = talloc_tos(); char *name = NULL; const char *dnsname; char *servername = NULL; if (!s) { return false; } /* Santize the string from '\\name' */ name = talloc_strdup(ctx, s); if (!name) { return false; } servername = strrchr_m(name, '\\' ); if (!servername) { servername = name; } else { servername++; } /* Optimize for the common case */ if (strequal(servername, lp_netbios_name())) { return true; } /* Check for an alias */ if (is_myname(servername)) { return true; } /* Check for loopback */ if (strequal(servername, "127.0.0.1") || strequal(servername, "::1")) { return true; } if (strequal(servername, "localhost")) { return true; } /* Maybe it's my dns name */ dnsname = get_mydnsfullname(); if (dnsname && strequal(servername, dnsname)) { return true; } /* Maybe its an IP address? */ if (is_ipaddress(servername)) { return is_my_ipaddr(servername); } /* Handle possible CNAME records - convert to an IP addr. list. */ { /* Use DNS to resolve the name, check all addresses. */ struct addrinfo *p = NULL; struct addrinfo *res = NULL; if (!interpret_string_addr_internal(&res, servername, AI_ADDRCONFIG)) { return false; } for (p = res; p; p = p->ai_next) { char addr[INET6_ADDRSTRLEN]; struct sockaddr_storage ss; ZERO_STRUCT(ss); memcpy(&ss, p->ai_addr, p->ai_addrlen); print_sockaddr(addr, sizeof(addr), &ss); if (is_my_ipaddr(addr)) { freeaddrinfo(res); return true; } } freeaddrinfo(res); } /* No match */ return false; } struct getaddrinfo_state { const char *node; const char *service; const struct addrinfo *hints; struct addrinfo *res; int ret; }; static void getaddrinfo_do(void *private_data); static void getaddrinfo_done(struct tevent_req *subreq); struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct fncall_context *ctx, const char *node, const char *service, const struct addrinfo *hints) { struct tevent_req *req, *subreq; struct getaddrinfo_state *state; req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state); if (req == NULL) { return NULL; } state->node = node; state->service = service; state->hints = hints; subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state); if (tevent_req_nomem(subreq, req)) { return tevent_req_post(req, ev); } tevent_req_set_callback(subreq, getaddrinfo_done, req); return req; } static void getaddrinfo_do(void *private_data) { struct getaddrinfo_state *state = (struct getaddrinfo_state *)private_data; state->ret = getaddrinfo(state->node, state->service, state->hints, &state->res); } static void getaddrinfo_done(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data( subreq, struct tevent_req); int ret, err; ret = fncall_recv(subreq, &err); TALLOC_FREE(subreq); if (ret == -1) { tevent_req_error(req, err); return; } tevent_req_done(req); } int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res) { struct getaddrinfo_state *state = tevent_req_data( req, struct getaddrinfo_state); int err; if (tevent_req_is_unix_error(req, &err)) { switch(err) { case ENOMEM: return EAI_MEMORY; default: return EAI_FAIL; } } if (state->ret == 0) { *res = state->res; } return state->ret; } int poll_one_fd(int fd, int events, int timeout, int *revents) { struct pollfd *fds; int ret; int saved_errno; fds = talloc_zero_array(talloc_tos(), struct pollfd, 2); if (fds == NULL) { errno = ENOMEM; return -1; } fds[0].fd = fd; fds[0].events = events; ret = sys_poll(fds, 1, timeout); /* * Assign whatever poll did, even in the ret<=0 case. */ *revents = fds[0].revents; saved_errno = errno; TALLOC_FREE(fds); errno = saved_errno; return ret; } int poll_intr_one_fd(int fd, int events, int timeout, int *revents) { struct pollfd pfd; int ret; pfd.fd = fd; pfd.events = events; ret = sys_poll_intr(&pfd, 1, timeout); if (ret <= 0) { *revents = 0; return ret; } *revents = pfd.revents; return 1; }