/* 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 . */ #include "includes.h" /**************************************************************************** Get a port number in host byte order from a sockaddr_storage. ****************************************************************************/ uint16_t get_sockaddr_port(const struct sockaddr_storage *pss) { uint16_t port = 0; if (pss->ss_family != AF_INET) { #if defined(HAVE_IPV6) /* IPv6 */ const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)pss; port = ntohs(sa6->sin6_port); #endif } else { const struct sockaddr_in *sa = (const struct sockaddr_in *)pss; port = ntohs(sa->sin_port); } return port; } /**************************************************************************** Print out an IPv4 or IPv6 address from a struct sockaddr_storage. ****************************************************************************/ static char *print_sockaddr_len(char *dest, size_t destlen, const struct sockaddr *psa, socklen_t psalen) { if (destlen > 0) { dest[0] = '\0'; } (void)sys_getnameinfo(psa, psalen, dest, destlen, NULL, 0, NI_NUMERICHOST); return dest; } /**************************************************************************** Print out an IPv4 or IPv6 address from a struct sockaddr_storage. ****************************************************************************/ char *print_sockaddr(char *dest, size_t destlen, const struct sockaddr_storage *psa) { return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa, sizeof(struct sockaddr_storage)); } /**************************************************************************** Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage. ****************************************************************************/ char *print_canonical_sockaddr(TALLOC_CTX *ctx, const struct sockaddr_storage *pss) { char addr[INET6_ADDRSTRLEN]; char *dest = NULL; int ret; /* Linux getnameinfo() man pages says port is unitialized if service name is NULL. */ ret = sys_getnameinfo((const struct sockaddr *)pss, sizeof(struct sockaddr_storage), addr, sizeof(addr), NULL, 0, NI_NUMERICHOST); if (ret != 0) { return NULL; } if (pss->ss_family != AF_INET) { #if defined(HAVE_IPV6) dest = talloc_asprintf(ctx, "[%s]", addr); #else return NULL; #endif } else { dest = talloc_asprintf(ctx, "%s", addr); } return dest; } /**************************************************************************** Return the string of an IP address (IPv4 or IPv6). ****************************************************************************/ static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len) { struct sockaddr_storage sa; socklen_t length = sizeof(sa); /* Ok, returning a hard coded IPv4 address * is bogus, but it's just as bogus as a * zero IPv6 address. No good choice here. */ strlcpy(addr_buf, "0.0.0.0", addr_len); if (fd == -1) { return addr_buf; } if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) { DEBUG(0,("getsockname failed. Error was %s\n", strerror(errno) )); return addr_buf; } return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length); } /**************************************************************************** Return the port number we've bound to on a socket. ****************************************************************************/ int get_socket_port(int fd) { struct sockaddr_storage sa; socklen_t length = sizeof(sa); if (fd == -1) { return -1; } if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) { int level = (errno == ENOTCONN) ? 2 : 0; DEBUG(level, ("getpeername failed. Error was %s\n", strerror(errno))); return -1; } #if defined(HAVE_IPV6) if (sa.ss_family == AF_INET6) { return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port); } #endif if (sa.ss_family == AF_INET) { return ntohs(((struct sockaddr_in *)&sa)->sin_port); } return -1; } 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); } const char *client_socket_addr(int fd, char *addr, size_t addr_len) { return get_socket_addr(fd, addr, addr_len); } #if 0 /* Not currently used. JRA. */ int client_socket_port(int fd) { return get_socket_port(fd); } #endif /**************************************************************************** Accessor functions to make thread-safe code easier later... ****************************************************************************/ void set_smb_read_error(enum smb_read_errors *pre, enum smb_read_errors newerr) { if (pre) { *pre = newerr; } } void cond_set_smb_read_error(enum smb_read_errors *pre, enum smb_read_errors newerr) { if (pre && *pre == SMB_READ_OK) { *pre = newerr; } } /**************************************************************************** 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); } enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; typedef struct smb_socket_option { const char *name; int level; int option; int value; int opttype; } smb_socket_option; static const smb_socket_option socket_options[] = { {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, #ifdef TCP_NODELAY {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, #endif #ifdef TCP_KEEPCNT {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT}, #endif #ifdef TCP_KEEPIDLE {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT}, #endif #ifdef TCP_KEEPINTVL {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT}, #endif #ifdef IPTOS_LOWDELAY {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, #endif #ifdef IPTOS_THROUGHPUT {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, #endif #ifdef SO_REUSEPORT {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL}, #endif #ifdef SO_SNDBUF {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, #endif #ifdef SO_RCVBUF {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, #endif #ifdef SO_SNDLOWAT {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, #endif #ifdef SO_RCVLOWAT {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, #endif #ifdef SO_SNDTIMEO {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, #endif #ifdef SO_RCVTIMEO {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, #endif #ifdef TCP_FASTACK {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT}, #endif #ifdef TCP_QUICKACK {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL}, #endif {NULL,0,0,0,0}}; /**************************************************************************** Print socket options. ****************************************************************************/ static void print_socket_options(int s) { int value; socklen_t vlen = 4; const smb_socket_option *p = &socket_options[0]; /* wrapped in if statement to prevent streams * leak in SCO Openserver 5.0 */ /* reported on samba-technical --jerry */ if ( DEBUGLEVEL >= 5 ) { DEBUG(5,("Socket options:\n")); for (; p->name != NULL; p++) { if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) { DEBUGADD(5,("\tCould not test socket option %s.\n", p->name)); } else { DEBUGADD(5,("\t%s = %d\n", p->name,value)); } } } } /**************************************************************************** Set user socket options. ****************************************************************************/ void set_socket_options(int fd, const char *options) { TALLOC_CTX *ctx = talloc_stackframe(); char *tok; while (next_token_talloc(ctx, &options, &tok," \t,")) { int ret=0,i; int value = 1; char *p; bool got_value = false; if ((p = strchr_m(tok,'='))) { *p = 0; value = atoi(p+1); got_value = true; } for (i=0;socket_options[i].name;i++) if (strequal(socket_options[i].name,tok)) break; if (!socket_options[i].name) { DEBUG(0,("Unknown socket option %s\n",tok)); continue; } switch (socket_options[i].opttype) { case OPT_BOOL: case OPT_INT: ret = setsockopt(fd,socket_options[i].level, socket_options[i].option, (char *)&value,sizeof(int)); break; case OPT_ON: if (got_value) DEBUG(0,("syntax error - %s " "does not take a value\n",tok)); { int on = socket_options[i].value; ret = setsockopt(fd,socket_options[i].level, socket_options[i].option, (char *)&on,sizeof(int)); } break; } if (ret != 0) { /* be aware that some systems like Solaris return * EINVAL to a setsockopt() call when the client * sent a RST previously - no need to worry */ DEBUG(2,("Failed to set socket option %s (Error %s)\n", tok, strerror(errno) )); } } TALLOC_FREE(ctx); print_socket_options(fd); } /**************************************************************************** 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) { fd_set fds; int selrtn; ssize_t readret; size_t nread = 0; struct timeval timeout; char addr[INET6_ADDRSTRLEN]; int save_errno; /* 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) { save_errno = errno; if (fd == smbd_server_fd()) { /* Try and give an error message * saying what client failed. */ DEBUG(0,("read_fd_with_timeout: " "client %s read error = %s.\n", get_peer_addr(fd,addr,sizeof(addr)), strerror(save_errno) )); } else { DEBUG(0,("read_fd_with_timeout: " "read error = %s.\n", strerror(save_errno) )); } return map_nt_error_from_unix(save_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 */ /* Set initial timeout */ timeout.tv_sec = (time_t)(time_out / 1000); timeout.tv_usec = (long)(1000 * (time_out % 1000)); for (nread=0; nread < mincnt; ) { FD_ZERO(&fds); FD_SET(fd,&fds); selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout); /* Check if error */ if (selrtn == -1) { save_errno = errno; /* something is wrong. Maybe the socket is dead? */ if (fd == smbd_server_fd()) { /* Try and give an error message saying * what client failed. */ DEBUG(0,("read_fd_with_timeout: timeout " "read for client %s. select error = %s.\n", get_peer_addr(fd,addr,sizeof(addr)), strerror(save_errno) )); } else { DEBUG(0,("read_fd_with_timeout: timeout " "read. select error = %s.\n", strerror(save_errno) )); } return map_nt_error_from_unix(save_errno); } /* Did we timeout ? */ if (selrtn == 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) { save_errno = errno; /* the descriptor is probably dead */ if (fd == smbd_server_fd()) { /* Try and give an error message * saying what client failed. */ DEBUG(0,("read_fd_with_timeout: timeout " "read to client %s. read error = %s.\n", get_peer_addr(fd,addr,sizeof(addr)), strerror(save_errno) )); } else { DEBUG(0,("read_fd_with_timeout: timeout " "read. read error = %s.\n", strerror(save_errno) )); } 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 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 = CONST_DISCARD(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] = SMBkeepalive; 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 == SMBkeepalive) { DEBUG(5,("Got keepalive packet\n")); } DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len))); return NT_STATUS_OK; } /**************************************************************************** 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 never return a session keepalive (length of zero). Timeout is in milliseconds. ****************************************************************************/ NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout, size_t *len) { uint8_t msgtype = SMBkeepalive; while (msgtype == SMBkeepalive) { NTSTATUS status; status = read_smb_length_return_keepalive(fd, inbuf, timeout, len); if (!NT_STATUS_IS_OK(status)) { return status; } msgtype = CVAL(inbuf, 0); } DEBUG(10,("read_smb_length: 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(10, ("receive_smb_raw: %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)) { 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 */ } /* 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_nsec; }; 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_nsec = 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(0, timeout*1000))) { 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_nsec))) { 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_nsec < 250000) { state->wait_nsec *= 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(0, state->wait_nsec))) { 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; } 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; } /******************************************************************* Create an outgoing TCP socket to the first addr that connects. This is for simultaneous connection attempts to port 445 and 139 of a host or for simultatneous connection attempts to multiple DCs at once. We return a socket fd of the first successful connection. @param[in] addrs list of Internet addresses and ports to connect to @param[in] num_addrs number of address/port pairs in the addrs list @param[in] timeout time after which we stop waiting for a socket connection to succeed, given in milliseconds @param[out] fd_index the entry in addrs which we successfully connected to @param[out] fd fd of the open and connected socket @return true on a successful connection, false if all connection attempts failed or we timed out *******************************************************************/ bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs, int timeout, int *fd_index, int *fd) { int i, resulting_index, res; int *sockets; bool good_connect; fd_set r_fds, wr_fds; struct timeval tv; int maxfd; int connect_loop = 10000; /* 10 milliseconds */ timeout *= 1000; /* convert to microseconds */ sockets = SMB_MALLOC_ARRAY(int, num_addrs); if (sockets == NULL) return false; resulting_index = -1; for (i=0; imaxfd) maxfd = sockets[i]; } tv.tv_sec = 0; tv.tv_usec = connect_loop; res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv); if (res < 0) goto done; if (res == 0) goto next_round; for (i=0; i timeout) connect_loop = timeout; goto connect_again; done: for (i=0; i= 0) close(sockets[i]); } if (resulting_index >= 0) { *fd_index = resulting_index; *fd = sockets[*fd_index]; set_blocking(*fd, true); } free(sockets); return (resulting_index >= 0); } /**************************************************************************** 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, (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)); } } /* can't pass the same source and dest strings in when you use --enable-developer or the clobber_region() call will get you */ 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); } /******************************************************************* 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()) || ((st.st_mode & 0777) != dir_perms)) { DEBUG(0, ("invalid permissions on socket directory " "%s\n", socket_dir)); 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; } if (listen(sock, 5) == -1) { DEBUG(0, ("listen 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 name ? ************************************************************/ bool is_myname_or_ipaddr(const char *s) { TALLOC_CTX *ctx = talloc_tos(); char addr[INET6_ADDRSTRLEN]; 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, global_myname())) { 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; } /* Handle possible CNAME records - convert to an IP addr. */ if (!is_ipaddress(servername)) { /* Use DNS to resolve the name, but only the first address */ struct sockaddr_storage ss; if (interpret_string_addr(&ss, servername, 0)) { print_sockaddr(addr, sizeof(addr), &ss); servername = addr; } } /* Maybe its an IP address? */ if (is_ipaddress(servername)) { struct sockaddr_storage ss; struct iface_struct *nics; int i, n; if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) { return false; } if (ismyaddr((struct sockaddr *)&ss)) { return true; } if (is_zero_addr((struct sockaddr *)&ss) || is_loopback_addr((struct sockaddr *)&ss)) { return false; } n = get_interfaces(talloc_tos(), &nics); for (i=0; inode = 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; }