/* * Copyright (c) 1998-2007, 2009, 2010 Proofpoint, Inc. and its suppliers. * All rights reserved. * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved. * Copyright (c) 1988, 1993 * The Regents of the University of California. All rights reserved. * * By using this file, you agree to the terms and conditions set * forth in the LICENSE file which can be found at the top level of * the sendmail distribution. * */ #include #include "map.h" SM_RCSID("@(#)$Id: daemon.c,v 8.698 2013-11-22 20:51:55 ca Exp $") #if defined(SOCK_STREAM) || defined(__GNU_LIBRARY__) # define USE_SOCK_STREAM 1 #endif #if defined(USE_SOCK_STREAM) # if NETINET || NETINET6 # include # endif # if NAMED_BIND # ifndef NO_DATA # define NO_DATA NO_ADDRESS # endif # endif /* NAMED_BIND */ #endif /* defined(USE_SOCK_STREAM) */ #if STARTTLS # include # if DANE # include "tls.h" # include "sm_resolve.h" # endif #endif #if NETINET6 # define FREEHOSTENT(h, s) \ do \ { \ if ((h) != (s) && (h) != NULL) \ { \ freehostent((h)); \ (h) = NULL; \ } \ } while (0) #else # define FREEHOSTENT(h, s) #endif #include #if IP_SRCROUTE && NETINET # include # include # if HAS_IN_H # include # ifndef IPOPTION # define IPOPTION ip_opts # define IP_LIST ip_opts # define IP_DST ip_dst # endif /* ! IPOPTION */ # else /* HAS_IN_H */ # include # ifndef IPOPTION # define IPOPTION ipoption # define IP_LIST ipopt_list # define IP_DST ipopt_dst # endif /* ! IPOPTION */ # endif /* HAS_IN_H */ #endif /* IP_SRCROUTE && NETINET */ #include #include #define DAEMON_C 1 #include static void connecttimeout __P((int)); static int opendaemonsocket __P((DAEMON_T *, bool)); static unsigned short setupdaemon __P((SOCKADDR *)); static void getrequests_checkdiskspace __P((ENVELOPE *e)); static void setsockaddroptions __P((char *, DAEMON_T *)); static void printdaemonflags __P((DAEMON_T *)); static int addr_family __P((char *)); static int addrcmp __P((struct hostent *, char *, SOCKADDR *)); static void authtimeout __P((int)); /* ** DAEMON.C -- routines to use when running as a daemon. ** ** This entire file is highly dependent on the 4.2 BSD ** interprocess communication primitives. No attempt has ** been made to make this file portable to Version 7, ** Version 6, MPX files, etc. If you should try such a ** thing yourself, I recommend chucking the entire file ** and starting from scratch. Basic semantics are: ** ** getrequests(e) ** Opens a port and initiates a connection. ** Returns in a child. Must set InChannel and ** OutChannel appropriately. ** clrdaemon() ** Close any open files associated with getting ** the connection; this is used when running the queue, ** etc., to avoid having extra file descriptors during ** the queue run and to avoid confusing the network ** code (if it cares). ** makeconnection(host, port, mci, e, enough) ** Make a connection to the named host on the given ** port. Returns zero on success, else an exit status ** describing the error. ** host_map_lookup(map, hbuf, avp, pstat) ** Convert the entry in hbuf into a canonical form. */ static int NDaemons = 0; /* actual number of daemons */ static time_t NextDiskSpaceCheck = 0; /* ** GETREQUESTS -- open mail IPC port and get requests. ** ** Parameters: ** e -- the current envelope. ** ** Returns: ** pointer to flags. ** ** Side Effects: ** Waits until some interesting activity occurs. When ** it does, a child is created to process it, and the ** parent waits for completion. Return from this ** routine is always in the child. The file pointers ** "InChannel" and "OutChannel" should be set to point ** to the communication channel. ** May restart persistent queue runners if they have ended ** for some reason. */ BITMAP256 * getrequests(e) ENVELOPE *e; { int t; int idx, curdaemon = -1; int i, olddaemon = 0; #if XDEBUG bool j_has_dot; #endif char status[MAXLINE]; SOCKADDR sa; SOCKADDR_LEN_T len = sizeof(sa); #if _FFR_QUEUE_RUN_PARANOIA time_t lastrun; #endif #if NETUNIX extern int ControlSocket; #endif extern ENVELOPE BlankEnvelope; /* initialize data for function that generates queue ids */ init_qid_alg(); for (idx = 0; idx < NDaemons; idx++) { Daemons[idx].d_port = setupdaemon(&(Daemons[idx].d_addr)); Daemons[idx].d_firsttime = true; Daemons[idx].d_refuse_connections_until = (time_t) 0; } /* ** Try to actually open the connection. */ if (tTd(15, 1)) { for (idx = 0; idx < NDaemons; idx++) { sm_dprintf("getrequests: daemon %s: port %d\n", Daemons[idx].d_name, ntohs(Daemons[idx].d_port)); } } /* get a socket for the SMTP connection */ for (idx = 0; idx < NDaemons; idx++) Daemons[idx].d_socksize = opendaemonsocket(&Daemons[idx], true); if (opencontrolsocket() < 0) sm_syslog(LOG_WARNING, NOQID, "daemon could not open control socket %s: %s", ControlSocketName, sm_errstring(errno)); /* If there are any queue runners released reapchild() co-ord's */ (void) sm_signal(SIGCHLD, reapchild); /* write the pid to file, command line args to syslog */ log_sendmail_pid(e); #if XDEBUG { char jbuf[MAXHOSTNAMELEN]; expand("\201j", jbuf, sizeof(jbuf), e); j_has_dot = strchr(jbuf, '.') != NULL; } #endif /* XDEBUG */ /* Add parent process as first item */ proc_list_add(CurrentPid, "Sendmail daemon", PROC_DAEMON, 0, -1, NULL); if (tTd(15, 1)) { for (idx = 0; idx < NDaemons; idx++) sm_dprintf("getrequests: daemon %s: socket %d\n", Daemons[idx].d_name, Daemons[idx].d_socket); } for (;;) { register pid_t pid; auto SOCKADDR_LEN_T lotherend; bool timedout = false; bool control = false; int save_errno; int pipefd[2]; time_t now; #if STARTTLS long seed; #endif /* see if we are rejecting connections */ (void) sm_blocksignal(SIGALRM); CHECK_RESTART; for (idx = 0; idx < NDaemons; idx++) { /* ** XXX do this call outside the loop? ** no: refuse_connections may sleep(). */ now = curtime(); if (now < Daemons[idx].d_refuse_connections_until) continue; if (bitnset(D_DISABLE, Daemons[idx].d_flags)) continue; if (refuseconnections(e, idx, curdaemon == idx)) { if (Daemons[idx].d_socket >= 0) { /* close socket so peer fails quickly */ (void) close(Daemons[idx].d_socket); Daemons[idx].d_socket = -1; } /* refuse connections for next 15 seconds */ Daemons[idx].d_refuse_connections_until = now + 15; } else if (Daemons[idx].d_socket < 0 || Daemons[idx].d_firsttime) { if (!Daemons[idx].d_firsttime && LogLevel > 8) sm_syslog(LOG_INFO, NOQID, "accepting connections again for daemon %s", Daemons[idx].d_name); /* arrange to (re)open the socket if needed */ (void) opendaemonsocket(&Daemons[idx], false); Daemons[idx].d_firsttime = false; } } /* May have been sleeping above, check again */ CHECK_RESTART; getrequests_checkdiskspace(e); #if XDEBUG /* check for disaster */ { char jbuf[MAXHOSTNAMELEN]; expand("\201j", jbuf, sizeof(jbuf), e); if (!wordinclass(jbuf, 'w')) { dumpstate("daemon lost $j"); sm_syslog(LOG_ALERT, NOQID, "daemon process doesn't have $j in $=w; see syslog"); abort(); } else if (j_has_dot && strchr(jbuf, '.') == NULL) { dumpstate("daemon $j lost dot"); sm_syslog(LOG_ALERT, NOQID, "daemon process $j lost dot; see syslog"); abort(); } } #endif /* XDEBUG */ #if 0 /* ** Andrew Sun claims that this will ** fix the SVr4 problem. But it seems to have gone away, ** so is it worth doing this? */ if (DaemonSocket >= 0 && SetNonBlocking(DaemonSocket, false) < 0) log an error here; #endif /* 0 */ (void) sm_releasesignal(SIGALRM); for (;;) { bool setproc = false; int highest = -1; fd_set readfds; struct timeval timeout; CHECK_RESTART; FD_ZERO(&readfds); for (idx = 0; idx < NDaemons; idx++) { /* wait for a connection */ if (Daemons[idx].d_socket >= 0) { if (!setproc && !bitnset(D_ETRNONLY, Daemons[idx].d_flags)) { sm_setproctitle(true, e, "accepting connections"); setproc = true; } if (Daemons[idx].d_socket > highest) highest = Daemons[idx].d_socket; SM_FD_SET(Daemons[idx].d_socket, &readfds); } } #if NETUNIX if (ControlSocket >= 0) { if (ControlSocket > highest) highest = ControlSocket; SM_FD_SET(ControlSocket, &readfds); } #endif /* NETUNIX */ timeout.tv_sec = 5; timeout.tv_usec = 0; t = select(highest + 1, FDSET_CAST &readfds, NULL, NULL, &timeout); /* Did someone signal while waiting? */ CHECK_RESTART; curdaemon = -1; if (doqueuerun()) { (void) runqueue(true, false, false, false); #if _FFR_QUEUE_RUN_PARANOIA lastrun = now; #endif } #if _FFR_QUEUE_RUN_PARANOIA else if (CheckQueueRunners > 0 && QueueIntvl > 0 && lastrun + QueueIntvl + CheckQueueRunners < now) { /* ** set lastrun unconditionally to avoid ** calling checkqueuerunner() all the time. ** That's also why we currently ignore the ** result of the function call. */ (void) checkqueuerunner(); lastrun = now; } #endif /* _FFR_QUEUE_RUN_PARANOIA */ if (t <= 0) { timedout = true; break; } control = false; errno = 0; /* look "round-robin" for an active socket */ if ((idx = olddaemon + 1) >= NDaemons) idx = 0; for (i = 0; i < NDaemons; i++) { if (Daemons[idx].d_socket >= 0 && SM_FD_ISSET(Daemons[idx].d_socket, &readfds)) { lotherend = Daemons[idx].d_socksize; memset(&RealHostAddr, '\0', sizeof(RealHostAddr)); t = accept(Daemons[idx].d_socket, (struct sockaddr *)&RealHostAddr, &lotherend); /* ** If remote side closes before ** accept() finishes, sockaddr ** might not be fully filled in. */ if (t >= 0 && (lotherend == 0 || #ifdef BSD4_4_SOCKADDR RealHostAddr.sa.sa_len == 0 || #endif RealHostAddr.sa.sa_family != Daemons[idx].d_addr.sa.sa_family)) { (void) close(t); t = -1; errno = EINVAL; } olddaemon = curdaemon = idx; break; } if (++idx >= NDaemons) idx = 0; } #if NETUNIX if (curdaemon == -1 && ControlSocket >= 0 && SM_FD_ISSET(ControlSocket, &readfds)) { struct sockaddr_un sa_un; lotherend = sizeof(sa_un); memset(&sa_un, '\0', sizeof(sa_un)); t = accept(ControlSocket, (struct sockaddr *)&sa_un, &lotherend); /* ** If remote side closes before ** accept() finishes, sockaddr ** might not be fully filled in. */ if (t >= 0 && (lotherend == 0 || # ifdef BSD4_4_SOCKADDR sa_un.sun_len == 0 || # endif sa_un.sun_family != AF_UNIX)) { (void) close(t); t = -1; errno = EINVAL; } if (t >= 0) control = true; } #else /* NETUNIX */ if (curdaemon == -1) { /* No daemon to service */ continue; } #endif /* NETUNIX */ if (t >= 0 || errno != EINTR) break; } if (timedout) { timedout = false; continue; } save_errno = errno; (void) sm_blocksignal(SIGALRM); if (t < 0) { errno = save_errno; /* let's ignore these temporary errors */ if (save_errno == EINTR #ifdef EAGAIN || save_errno == EAGAIN #endif #ifdef ECONNABORTED || save_errno == ECONNABORTED #endif #ifdef EWOULDBLOCK || save_errno == EWOULDBLOCK #endif ) continue; syserr("getrequests: accept"); if (curdaemon >= 0) { /* arrange to re-open socket next time around */ (void) close(Daemons[curdaemon].d_socket); Daemons[curdaemon].d_socket = -1; #if SO_REUSEADDR_IS_BROKEN /* ** Give time for bound socket to be released. ** This creates a denial-of-service if you can ** force accept() to fail on affected systems. */ Daemons[curdaemon].d_refuse_connections_until = curtime() + 15; #endif /* SO_REUSEADDR_IS_BROKEN */ } continue; } if (!control) { /* set some daemon related macros */ switch (Daemons[curdaemon].d_addr.sa.sa_family) { case AF_UNSPEC: macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_family}"), "unspec"); break; #if NETUNIX case AF_UNIX: macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_family}"), "local"); break; #endif #if NETINET case AF_INET: macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_family}"), "inet"); break; #endif #if NETINET6 case AF_INET6: macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_family}"), "inet6"); break; #endif #if NETISO case AF_ISO: macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_family}"), "iso"); break; #endif #if NETNS case AF_NS: macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_family}"), "ns"); break; #endif #if NETX25 case AF_CCITT: macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_family}"), "x.25"); break; #endif } macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_name}"), Daemons[curdaemon].d_name); if (Daemons[curdaemon].d_mflags != NULL) macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_flags}"), Daemons[curdaemon].d_mflags); else macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{daemon_flags}"), ""); } /* ** If connection rate is exceeded here, connection shall be ** refused later by a new call after fork() by the ** validate_connection() function. Closing the connection ** at this point violates RFC 2821. ** Do NOT remove this call, its side effects are needed. */ connection_rate_check(&RealHostAddr, NULL); /* ** Create a subprocess to process the mail. */ if (tTd(15, 2)) sm_dprintf("getrequests: forking (fd = %d)\n", t); /* ** Advance state of PRNG. ** This is necessary because otherwise all child processes ** will produce the same PRN sequence and hence the selection ** of a queue directory (and other things, e.g., MX selection) ** are not "really" random. */ #if STARTTLS /* XXX get some better "random" data? */ seed = get_random(); RAND_seed((void *) &NextDiskSpaceCheck, sizeof(NextDiskSpaceCheck)); RAND_seed((void *) &now, sizeof(now)); RAND_seed((void *) &seed, sizeof(seed)); #else /* STARTTLS */ (void) get_random(); #endif /* STARTTLS */ #if NAMED_BIND /* ** Update MX records for FallbackMX. ** Let's hope this is fast otherwise we screw up the ** response time. */ if (FallbackMX != NULL) (void) getfallbackmxrr(FallbackMX); #endif /* NAMED_BIND */ if (tTd(93, 100)) { /* don't fork, handle connection in this process */ pid = 0; pipefd[0] = pipefd[1] = -1; } else { /* ** Create a pipe to keep the child from writing to ** the socket until after the parent has closed ** it. Otherwise the parent may hang if the child ** has closed it first. */ if (pipe(pipefd) < 0) pipefd[0] = pipefd[1] = -1; (void) sm_blocksignal(SIGCHLD); pid = fork(); if (pid < 0) { syserr("daemon: cannot fork"); if (pipefd[0] != -1) { (void) close(pipefd[0]); (void) close(pipefd[1]); } (void) sm_releasesignal(SIGCHLD); (void) sleep(10); (void) close(t); continue; } } if (pid == 0) { char *p; SM_FILE_T *inchannel, *outchannel = NULL; /* ** CHILD -- return to caller. ** Collect verified idea of sending host. ** Verify calling user id if possible here. */ /* Reset global flags */ RestartRequest = NULL; RestartWorkGroup = false; ShutdownRequest = NULL; PendingSignal = 0; CurrentPid = getpid(); close_sendmail_pid(); (void) sm_releasesignal(SIGALRM); (void) sm_releasesignal(SIGCHLD); (void) sm_signal(SIGCHLD, SIG_DFL); (void) sm_signal(SIGHUP, SIG_DFL); (void) sm_signal(SIGTERM, intsig); /* turn on profiling */ /* SM_PROF(0); */ /* ** Initialize exception stack and default exception ** handler for child process. */ sm_exc_newthread(fatal_error); if (!control) { macdefine(&BlankEnvelope.e_macro, A_TEMP, macid("{daemon_addr}"), anynet_ntoa(&Daemons[curdaemon].d_addr)); (void) sm_snprintf(status, sizeof(status), "%d", ntohs(Daemons[curdaemon].d_port)); macdefine(&BlankEnvelope.e_macro, A_TEMP, macid("{daemon_port}"), status); } for (idx = 0; idx < NDaemons; idx++) { if (Daemons[idx].d_socket >= 0) (void) close(Daemons[idx].d_socket); Daemons[idx].d_socket = -1; } clrcontrol(); /* Avoid SMTP daemon actions if control command */ if (control) { /* Add control socket process */ proc_list_add(CurrentPid, "console socket child", PROC_CONTROL_CHILD, 0, -1, NULL); } else { proc_list_clear(); /* clean up background delivery children */ (void) sm_signal(SIGCHLD, reapchild); /* Add parent process as first child item */ proc_list_add(CurrentPid, "daemon child", PROC_DAEMON_CHILD, 0, -1, NULL); /* don't schedule queue runs if ETRN */ QueueIntvl = 0; /* ** Hack: override global variables if ** the corresponding DaemonPortOption ** is set. */ #if _FFR_SS_PER_DAEMON if (Daemons[curdaemon].d_supersafe != DPO_NOTSET) SuperSafe = Daemons[curdaemon]. d_supersafe; #endif /* _FFR_SS_PER_DAEMON */ if (Daemons[curdaemon].d_dm != DM_NOTSET) set_delivery_mode( Daemons[curdaemon].d_dm, e); if (Daemons[curdaemon].d_refuseLA != DPO_NOTSET) RefuseLA = Daemons[curdaemon]. d_refuseLA; if (Daemons[curdaemon].d_queueLA != DPO_NOTSET) QueueLA = Daemons[curdaemon].d_queueLA; if (Daemons[curdaemon].d_delayLA != DPO_NOTSET) DelayLA = Daemons[curdaemon].d_delayLA; if (Daemons[curdaemon].d_maxchildren != DPO_NOTSET) MaxChildren = Daemons[curdaemon]. d_maxchildren; sm_setproctitle(true, e, "startup with %s", anynet_ntoa(&RealHostAddr)); } if (pipefd[0] != -1) { auto char c; /* ** Wait for the parent to close the write end ** of the pipe, which we will see as an EOF. ** This guarantees that we won't write to the ** socket until after the parent has closed ** the pipe. */ /* close the write end of the pipe */ (void) close(pipefd[1]); /* we shouldn't be interrupted, but ... */ while (read(pipefd[0], &c, 1) < 0 && errno == EINTR) continue; (void) close(pipefd[0]); } /* control socket processing */ if (control) { control_command(t, e); /* NOTREACHED */ exit(EX_SOFTWARE); } /* determine host name */ p = hostnamebyanyaddr(&RealHostAddr); if (strlen(p) > MAXNAME) /* XXX - 1 ? */ p[MAXNAME] = '\0'; RealHostName = newstr(p); if (RealHostName[0] == '[') { macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{client_resolve}"), h_errno == TRY_AGAIN ? "TEMP" : "FAIL"); } else { macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{client_resolve}"), "OK"); } sm_setproctitle(true, e, "startup with %s", p); markstats(e, NULL, STATS_CONNECT); if ((inchannel = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &t, SM_IO_RDONLY_B, NULL)) == NULL || (t = dup(t)) < 0 || (outchannel = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &t, SM_IO_WRONLY_B, NULL)) == NULL) { syserr("cannot open SMTP server channel, fd=%d", t); finis(false, true, EX_OK); } sm_io_automode(inchannel, outchannel); InChannel = inchannel; OutChannel = outchannel; DisConnected = false; #if _FFR_XCNCT t = xconnect(inchannel); if (t <= 0) { clrbitn(D_XCNCT, Daemons[curdaemon].d_flags); clrbitn(D_XCNCT_M, Daemons[curdaemon].d_flags); } else setbitn(t, Daemons[curdaemon].d_flags); #endif /* _FFR_XCNCT */ #if XLA if (!xla_host_ok(RealHostName)) { message("421 4.4.5 Too many SMTP sessions for this host"); finis(false, true, EX_OK); } #endif /* XLA */ /* find out name for interface of connection */ if (getsockname(sm_io_getinfo(InChannel, SM_IO_WHAT_FD, NULL), &sa.sa, &len) == 0) { p = hostnamebyanyaddr(&sa); if (tTd(15, 9)) sm_dprintf("getreq: got name %s\n", p); macdefine(&BlankEnvelope.e_macro, A_TEMP, macid("{if_name}"), p); /* ** Do this only if it is not the loopback ** interface. */ if (!isloopback(sa)) { char *addr; char family[5]; addr = anynet_ntoa(&sa); (void) sm_snprintf(family, sizeof(family), "%d", sa.sa.sa_family); macdefine(&BlankEnvelope.e_macro, A_TEMP, macid("{if_addr}"), addr); macdefine(&BlankEnvelope.e_macro, A_TEMP, macid("{if_family}"), family); if (tTd(15, 7)) sm_dprintf("getreq: got addr %s and family %s\n", addr, family); } else { macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_addr}"), NULL); macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_family}"), NULL); } } else { if (tTd(15, 7)) sm_dprintf("getreq: getsockname failed\n"); macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_name}"), NULL); macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_addr}"), NULL); macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_family}"), NULL); } break; } /* parent -- keep track of children */ if (control) { (void) sm_snprintf(status, sizeof(status), "control socket server child"); proc_list_add(pid, status, PROC_CONTROL, 0, -1, NULL); } else { (void) sm_snprintf(status, sizeof(status), "SMTP server child for %s", anynet_ntoa(&RealHostAddr)); proc_list_add(pid, status, PROC_DAEMON, 0, -1, &RealHostAddr); } (void) sm_releasesignal(SIGCHLD); /* close the read end of the synchronization pipe */ if (pipefd[0] != -1) { (void) close(pipefd[0]); pipefd[0] = -1; } /* close the port so that others will hang (for a while) */ (void) close(t); /* release the child by closing the read end of the sync pipe */ if (pipefd[1] != -1) { (void) close(pipefd[1]); pipefd[1] = -1; } } if (tTd(15, 2)) sm_dprintf("getreq: returning\n"); #if MILTER /* set the filters for this daemon */ if (Daemons[curdaemon].d_inputfilterlist != NULL) { for (i = 0; (i < MAXFILTERS && Daemons[curdaemon].d_inputfilters[i] != NULL); i++) { InputFilters[i] = Daemons[curdaemon].d_inputfilters[i]; } if (i < MAXFILTERS) InputFilters[i] = NULL; } #endif /* MILTER */ return &Daemons[curdaemon].d_flags; } /* ** GETREQUESTS_CHECKDISKSPACE -- check available diskspace. ** ** Parameters: ** e -- envelope. ** ** Returns: ** none. ** ** Side Effects: ** Modifies Daemon flags (D_ETRNONLY) if not enough disk space. */ static void getrequests_checkdiskspace(e) ENVELOPE *e; { bool logged = false; int idx; time_t now; now = curtime(); if (now < NextDiskSpaceCheck) return; /* Check if there is available disk space in all queue groups. */ if (!enoughdiskspace(0, NULL)) { for (idx = 0; idx < NDaemons; ++idx) { if (bitnset(D_ETRNONLY, Daemons[idx].d_flags)) continue; /* log only if not logged before */ if (!logged) { if (LogLevel > 8) sm_syslog(LOG_INFO, NOQID, "rejecting new messages: min free: %ld", MinBlocksFree); sm_setproctitle(true, e, "rejecting new messages: min free: %ld", MinBlocksFree); logged = true; } setbitn(D_ETRNONLY, Daemons[idx].d_flags); } } else { for (idx = 0; idx < NDaemons; ++idx) { if (!bitnset(D_ETRNONLY, Daemons[idx].d_flags)) continue; /* log only if not logged before */ if (!logged) { if (LogLevel > 8) sm_syslog(LOG_INFO, NOQID, "accepting new messages (again)"); logged = true; } /* title will be set later */ clrbitn(D_ETRNONLY, Daemons[idx].d_flags); } } /* only check disk space once a minute */ NextDiskSpaceCheck = now + 60; } /* ** OPENDAEMONSOCKET -- open SMTP socket ** ** Deals with setting all appropriate options. ** ** Parameters: ** d -- the structure for the daemon to open. ** firsttime -- set if this is the initial open. ** ** Returns: ** Size in bytes of the daemon socket addr. ** ** Side Effects: ** Leaves DaemonSocket set to the open socket. ** Exits if the socket cannot be created. */ #define MAXOPENTRIES 10 /* maximum number of tries to open connection */ static int opendaemonsocket(d, firsttime) DAEMON_T *d; bool firsttime; { int on = 1; int fdflags; SOCKADDR_LEN_T socksize = 0; int ntries = 0; int save_errno; if (tTd(15, 2)) sm_dprintf("opendaemonsocket(%s)\n", d->d_name); do { if (ntries > 0) (void) sleep(5); if (firsttime || d->d_socket < 0) { #if NETUNIX if (d->d_addr.sa.sa_family == AF_UNIX) { int rval; long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_ROOTOK|SFF_EXECOK|SFF_CREAT; /* if not safe, don't use it */ rval = safefile(d->d_addr.sunix.sun_path, RunAsUid, RunAsGid, RunAsUserName, sff, S_IRUSR|S_IWUSR, NULL); if (rval != 0) { save_errno = errno; syserr("opendaemonsocket: daemon %s: unsafe domain socket %s", d->d_name, d->d_addr.sunix.sun_path); goto fail; } /* Don't try to overtake an existing socket */ (void) unlink(d->d_addr.sunix.sun_path); } #endif /* NETUNIX */ d->d_socket = socket(d->d_addr.sa.sa_family, SOCK_STREAM, 0); if (d->d_socket < 0) { save_errno = errno; syserr("opendaemonsocket: daemon %s: can't create server SMTP socket", d->d_name); fail: if (bitnset(D_OPTIONAL, d->d_flags) && (!transienterror(save_errno) || ntries >= MAXOPENTRIES - 1)) { syserr("opendaemonsocket: daemon %s: optional socket disabled", d->d_name); setbitn(D_DISABLE, d->d_flags); d->d_socket = -1; return -1; } severe: if (LogLevel > 0) sm_syslog(LOG_ALERT, NOQID, "daemon %s: problem creating SMTP socket", d->d_name); d->d_socket = -1; continue; } if (!SM_FD_OK_SELECT(d->d_socket)) { save_errno = EINVAL; syserr("opendaemonsocket: daemon %s: server SMTP socket (%d) too large", d->d_name, d->d_socket); goto fail; } /* turn on network debugging? */ if (tTd(15, 101)) (void) setsockopt(d->d_socket, SOL_SOCKET, SO_DEBUG, (char *)&on, sizeof(on)); (void) setsockopt(d->d_socket, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)); (void) setsockopt(d->d_socket, SOL_SOCKET, SO_KEEPALIVE, (char *)&on, sizeof(on)); #ifdef SO_RCVBUF if (d->d_tcprcvbufsize > 0) { if (setsockopt(d->d_socket, SOL_SOCKET, SO_RCVBUF, (char *) &d->d_tcprcvbufsize, sizeof(d->d_tcprcvbufsize)) < 0) syserr("opendaemonsocket: daemon %s: setsockopt(SO_RCVBUF)", d->d_name); } #endif /* SO_RCVBUF */ #ifdef SO_SNDBUF if (d->d_tcpsndbufsize > 0) { if (setsockopt(d->d_socket, SOL_SOCKET, SO_SNDBUF, (char *) &d->d_tcpsndbufsize, sizeof(d->d_tcpsndbufsize)) < 0) syserr("opendaemonsocket: daemon %s: setsockopt(SO_SNDBUF)", d->d_name); } #endif /* SO_SNDBUF */ if ((fdflags = fcntl(d->d_socket, F_GETFD, 0)) == -1 || fcntl(d->d_socket, F_SETFD, fdflags | FD_CLOEXEC) == -1) { save_errno = errno; syserr("opendaemonsocket: daemon %s: failed to %s close-on-exec flag: %s", d->d_name, fdflags == -1 ? "get" : "set", sm_errstring(save_errno)); (void) close(d->d_socket); goto severe; } switch (d->d_addr.sa.sa_family) { #ifdef NETUNIX case AF_UNIX: socksize = sizeof(d->d_addr.sunix); break; #endif #if NETINET case AF_INET: socksize = sizeof(d->d_addr.sin); break; #endif #if NETINET6 case AF_INET6: socksize = sizeof(d->d_addr.sin6); break; #endif #if NETISO case AF_ISO: socksize = sizeof(d->d_addr.siso); break; #endif default: socksize = sizeof(d->d_addr); break; } if (bind(d->d_socket, &d->d_addr.sa, socksize) < 0) { /* probably another daemon already */ save_errno = errno; syserr("opendaemonsocket: daemon %s: cannot bind", d->d_name); (void) close(d->d_socket); goto fail; } } if (!firsttime && listen(d->d_socket, d->d_listenqueue) < 0) { save_errno = errno; syserr("opendaemonsocket: daemon %s: cannot listen", d->d_name); (void) close(d->d_socket); goto severe; } return socksize; } while (ntries++ < MAXOPENTRIES && transienterror(save_errno)); syserr("!opendaemonsocket: daemon %s: server SMTP socket wedged: exiting", d->d_name); /* NOTREACHED */ return -1; /* avoid compiler warning on IRIX */ } /* ** SETUPDAEMON -- setup socket for daemon ** ** Parameters: ** daemonaddr -- socket for daemon ** ** Returns: ** port number on which daemon should run ** */ static unsigned short setupdaemon(daemonaddr) SOCKADDR *daemonaddr; { unsigned short port; /* ** Set up the address for the mailer. */ if (daemonaddr->sa.sa_family == AF_UNSPEC) { memset(daemonaddr, '\0', sizeof(*daemonaddr)); #if NETINET daemonaddr->sa.sa_family = AF_INET; #endif } switch (daemonaddr->sa.sa_family) { #if NETINET case AF_INET: if (daemonaddr->sin.sin_addr.s_addr == 0) daemonaddr->sin.sin_addr.s_addr = LocalDaemon ? htonl(INADDR_LOOPBACK) : INADDR_ANY; port = daemonaddr->sin.sin_port; break; #endif /* NETINET */ #if NETINET6 case AF_INET6: if (IN6_IS_ADDR_UNSPECIFIED(&daemonaddr->sin6.sin6_addr)) daemonaddr->sin6.sin6_addr = (LocalDaemon && V6LoopbackAddrFound) ? in6addr_loopback : in6addr_any; port = daemonaddr->sin6.sin6_port; break; #endif /* NETINET6 */ default: /* unknown protocol */ port = 0; break; } if (port == 0) { #ifdef NO_GETSERVBYNAME port = htons(25); #else /* NO_GETSERVBYNAME */ { register struct servent *sp; sp = getservbyname("smtp", "tcp"); if (sp == NULL) { syserr("554 5.3.5 service \"smtp\" unknown"); port = htons(25); } else port = sp->s_port; } #endif /* NO_GETSERVBYNAME */ } switch (daemonaddr->sa.sa_family) { #if NETINET case AF_INET: daemonaddr->sin.sin_port = port; break; #endif #if NETINET6 case AF_INET6: daemonaddr->sin6.sin6_port = port; break; #endif default: /* unknown protocol */ break; } return port; } /* ** CLRDAEMON -- reset the daemon connection ** ** Parameters: ** none. ** ** Returns: ** none. ** ** Side Effects: ** releases any resources used by the passive daemon. */ void clrdaemon() { int i; for (i = 0; i < NDaemons; i++) { if (Daemons[i].d_socket >= 0) (void) close(Daemons[i].d_socket); Daemons[i].d_socket = -1; } } /* ** GETMODIFIERS -- get modifier flags ** ** Parameters: ** v -- the modifiers (input text line). ** modifiers -- pointer to flag field to represent modifiers. ** ** Returns: ** (xallocat()ed) string representation of modifiers. ** ** Side Effects: ** fills in modifiers. */ char * getmodifiers(v, modifiers) char *v; BITMAP256 modifiers; { int l; char *h, *f, *flags; /* maximum length of flags: upper case Option -> "OO " */ l = 3 * strlen(v) + 3; /* is someone joking? */ if (l < 0 || l > 256) { if (LogLevel > 2) sm_syslog(LOG_ERR, NOQID, "getmodifiers too long, ignored"); return NULL; } flags = xalloc(l); f = flags; clrbitmap(modifiers); for (h = v; *h != '\0'; h++) { if (isascii(*h) && !isspace(*h) && isprint(*h)) { setbitn(*h, modifiers); if (flags != f) *flags++ = ' '; *flags++ = *h; if (isupper(*h)) *flags++ = *h; } } *flags++ = '\0'; return f; } /* ** CHKDAEMONMODIFIERS -- check whether all daemons have set a flag. ** ** Parameters: ** flag -- the flag to test. ** ** Returns: ** true iff all daemons have set flag. */ bool chkdaemonmodifiers(flag) int flag; { int i; for (i = 0; i < NDaemons; i++) if (!bitnset((char) flag, Daemons[i].d_flags)) return false; return true; } /* ** SETSOCKADDROPTIONS -- set options for SOCKADDR (daemon or client) ** ** Parameters: ** p -- the options line. ** d -- the daemon structure to fill in. ** ** Returns: ** none. */ static void setsockaddroptions(p, d) char *p; DAEMON_T *d; { #if NETISO short portno; #endif char *port = NULL; char *addr = NULL; #if NETINET if (d->d_addr.sa.sa_family == AF_UNSPEC) d->d_addr.sa.sa_family = AF_INET; #endif #if _FFR_SS_PER_DAEMON d->d_supersafe = DPO_NOTSET; #endif d->d_dm = DM_NOTSET; d->d_refuseLA = DPO_NOTSET; d->d_queueLA = DPO_NOTSET; d->d_delayLA = DPO_NOTSET; d->d_maxchildren = DPO_NOTSET; while (p != NULL) { register char *f; register char *v; while (SM_ISSPACE(*p)) p++; if (*p == '\0') break; f = p; p = strchr(p, ','); if (p != NULL) *p++ = '\0'; v = strchr(f, '='); if (v == NULL) continue; while (isascii(*++v) && isspace(*v)) continue; switch (*f) { case 'A': /* address */ #if !_FFR_DPO_CS case 'a': #endif addr = v; break; case 'c': d->d_maxchildren = atoi(v); break; case 'D': /* DeliveryMode */ switch (*v) { case SM_QUEUE: case SM_DEFER: case SM_DELIVER: case SM_FORK: #if _FFR_PROXY case SM_PROXY_REQ: #endif d->d_dm = *v; break; default: syserr("554 5.3.5 Unknown delivery mode %c", *v); break; } break; case 'd': /* delayLA */ d->d_delayLA = atoi(v); break; case 'F': /* address family */ #if !_FFR_DPO_CS case 'f': #endif if (isascii(*v) && isdigit(*v)) d->d_addr.sa.sa_family = atoi(v); #ifdef NETUNIX else if (sm_strcasecmp(v, "unix") == 0 || sm_strcasecmp(v, "local") == 0) d->d_addr.sa.sa_family = AF_UNIX; #endif #if NETINET else if (sm_strcasecmp(v, "inet") == 0) d->d_addr.sa.sa_family = AF_INET; #endif #if NETINET6 else if (sm_strcasecmp(v, "inet6") == 0) d->d_addr.sa.sa_family = AF_INET6; #endif #if NETISO else if (sm_strcasecmp(v, "iso") == 0) d->d_addr.sa.sa_family = AF_ISO; #endif #if NETNS else if (sm_strcasecmp(v, "ns") == 0) d->d_addr.sa.sa_family = AF_NS; #endif #if NETX25 else if (sm_strcasecmp(v, "x.25") == 0) d->d_addr.sa.sa_family = AF_CCITT; #endif else syserr("554 5.3.5 Unknown address family %s in Family=option", v); break; #if MILTER case 'I': # if !_FFR_DPO_CS case 'i': # endif d->d_inputfilterlist = v; break; #endif /* MILTER */ case 'L': /* listen queue size */ #if !_FFR_DPO_CS case 'l': #endif d->d_listenqueue = atoi(v); break; case 'M': /* modifiers (flags) */ #if !_FFR_DPO_CS case 'm': #endif d->d_mflags = getmodifiers(v, d->d_flags); break; case 'N': /* name */ #if !_FFR_DPO_CS case 'n': #endif d->d_name = v; break; case 'P': /* port */ #if !_FFR_DPO_CS case 'p': #endif port = v; break; case 'q': d->d_queueLA = atoi(v); break; case 'R': /* receive buffer size */ d->d_tcprcvbufsize = atoi(v); break; case 'r': d->d_refuseLA = atoi(v); break; case 'S': /* send buffer size */ #if !_FFR_DPO_CS case 's': #endif d->d_tcpsndbufsize = atoi(v); break; #if _FFR_SS_PER_DAEMON case 'T': /* SuperSafe */ if (tolower(*v) == 'i') d->d_supersafe = SAFE_INTERACTIVE; else if (tolower(*v) == 'p') # if MILTER d->d_supersafe = SAFE_REALLY_POSTMILTER; # else /* MILTER */ (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, "Warning: SuperSafe=PostMilter requires Milter support (-DMILTER)\n"); # endif /* MILTER */ else d->d_supersafe = atobool(v) ? SAFE_REALLY : SAFE_NO; break; #endif /* _FFR_SS_PER_DAEMON */ default: syserr("554 5.3.5 PortOptions parameter \"%s\" unknown", f); } } /* Check addr and port after finding family */ if (addr != NULL) { switch (d->d_addr.sa.sa_family) { #if NETUNIX case AF_UNIX: if (strlen(addr) >= sizeof(d->d_addr.sunix.sun_path)) { errno = ENAMETOOLONG; syserr("setsockaddroptions: domain socket name too long: %s > %ld", addr, (long) sizeof(d->d_addr.sunix.sun_path)); break; } /* file safety check done in opendaemonsocket() */ (void) memset(&d->d_addr.sunix.sun_path, '\0', sizeof(d->d_addr.sunix.sun_path)); (void) sm_strlcpy((char *)&d->d_addr.sunix.sun_path, addr, sizeof(d->d_addr.sunix.sun_path)); break; #endif /* NETUNIX */ #if NETINET case AF_INET: if (!isascii(*addr) || !isdigit(*addr) || ((d->d_addr.sin.sin_addr.s_addr = inet_addr(addr)) == INADDR_NONE)) { register struct hostent *hp; hp = sm_gethostbyname(addr, AF_INET); if (hp == NULL) syserr("554 5.3.0 host \"%s\" unknown", addr); else { while (*(hp->h_addr_list) != NULL && hp->h_addrtype != AF_INET) hp->h_addr_list++; if (*(hp->h_addr_list) == NULL) syserr("554 5.3.0 host \"%s\" unknown", addr); else memmove(&d->d_addr.sin.sin_addr, *(hp->h_addr_list), INADDRSZ); FREEHOSTENT(hp, NULL); } } break; #endif /* NETINET */ #if NETINET6 case AF_INET6: if (anynet_pton(AF_INET6, addr, &d->d_addr.sin6.sin6_addr) != 1) { register struct hostent *hp; hp = sm_gethostbyname(addr, AF_INET6); if (hp == NULL) syserr("554 5.3.0 host \"%s\" unknown", addr); else { while (*(hp->h_addr_list) != NULL && hp->h_addrtype != AF_INET6) hp->h_addr_list++; if (*(hp->h_addr_list) == NULL) syserr("554 5.3.0 host \"%s\" unknown", addr); else memmove(&d->d_addr.sin6.sin6_addr, *(hp->h_addr_list), IN6ADDRSZ); FREEHOSTENT(hp, NULL); } } break; #endif /* NETINET6 */ default: syserr("554 5.3.5 address= option unsupported for family %d", d->d_addr.sa.sa_family); break; } } if (port != NULL) { switch (d->d_addr.sa.sa_family) { #if NETINET case AF_INET: if (isascii(*port) && isdigit(*port)) d->d_addr.sin.sin_port = htons((unsigned short) atoi((const char *) port)); else { # ifdef NO_GETSERVBYNAME syserr("554 5.3.5 invalid port number: %s", port); # else /* NO_GETSERVBYNAME */ register struct servent *sp; sp = getservbyname(port, "tcp"); if (sp == NULL) syserr("554 5.3.5 service \"%s\" unknown", port); else d->d_addr.sin.sin_port = sp->s_port; # endif /* NO_GETSERVBYNAME */ } break; #endif /* NETINET */ #if NETINET6 case AF_INET6: if (isascii(*port) && isdigit(*port)) d->d_addr.sin6.sin6_port = htons((unsigned short) atoi(port)); else { # ifdef NO_GETSERVBYNAME syserr("554 5.3.5 invalid port number: %s", port); # else /* NO_GETSERVBYNAME */ register struct servent *sp; sp = getservbyname(port, "tcp"); if (sp == NULL) syserr("554 5.3.5 service \"%s\" unknown", port); else d->d_addr.sin6.sin6_port = sp->s_port; # endif /* NO_GETSERVBYNAME */ } break; #endif /* NETINET6 */ #if NETISO case AF_ISO: /* assume two byte transport selector */ if (isascii(*port) && isdigit(*port)) portno = htons((unsigned short) atoi(port)); else { # ifdef NO_GETSERVBYNAME syserr("554 5.3.5 invalid port number: %s", port); # else /* NO_GETSERVBYNAME */ register struct servent *sp; sp = getservbyname(port, "tcp"); if (sp == NULL) syserr("554 5.3.5 service \"%s\" unknown", port); else portno = sp->s_port; # endif /* NO_GETSERVBYNAME */ } memmove(TSEL(&d->d_addr.siso), (char *) &portno, 2); break; #endif /* NETISO */ default: syserr("554 5.3.5 Port= option unsupported for family %d", d->d_addr.sa.sa_family); break; } } } /* ** SETDAEMONOPTIONS -- set options for running the MTA daemon ** ** Parameters: ** p -- the options line. ** ** Returns: ** true if successful, false otherwise. ** ** Side Effects: ** increments number of daemons. */ #define DEF_LISTENQUEUE 10 struct dflags { char *d_name; int d_flag; }; static struct dflags DaemonFlags[] = { { "AUTHREQ", D_AUTHREQ }, { "BINDIF", D_BINDIF }, { "CANONREQ", D_CANONREQ }, { "IFNHELO", D_IFNHELO }, { "FQMAIL", D_FQMAIL }, { "FQRCPT", D_FQRCPT }, { "SMTPS", D_SMTPS }, { "UNQUALOK", D_UNQUALOK }, { "NOAUTH", D_NOAUTH }, { "NOCANON", D_NOCANON }, { "NOETRN", D_NOETRN }, { "NOTLS", D_NOTLS }, { "ETRNONLY", D_ETRNONLY }, { "OPTIONAL", D_OPTIONAL }, { "DISABLE", D_DISABLE }, { "ISSET", D_ISSET }, { NULL, 0 } }; static void printdaemonflags(d) DAEMON_T *d; { register struct dflags *df; bool first = true; for (df = DaemonFlags; df->d_name != NULL; df++) { if (!bitnset(df->d_flag, d->d_flags)) continue; if (first) sm_dprintf("<%s", df->d_name); else sm_dprintf(",%s", df->d_name); first = false; } if (!first) sm_dprintf(">"); } bool setdaemonoptions(p) register char *p; { if (NDaemons >= MAXDAEMONS) return false; Daemons[NDaemons].d_socket = -1; Daemons[NDaemons].d_listenqueue = DEF_LISTENQUEUE; clrbitmap(Daemons[NDaemons].d_flags); setsockaddroptions(p, &Daemons[NDaemons]); #if MILTER if (Daemons[NDaemons].d_inputfilterlist != NULL) Daemons[NDaemons].d_inputfilterlist = newstr(Daemons[NDaemons].d_inputfilterlist); #endif if (Daemons[NDaemons].d_name != NULL) Daemons[NDaemons].d_name = newstr(Daemons[NDaemons].d_name); else { char num[30]; (void) sm_snprintf(num, sizeof(num), "Daemon%d", NDaemons); Daemons[NDaemons].d_name = newstr(num); } if (tTd(37, 1)) { sm_dprintf("Daemon %s flags: ", Daemons[NDaemons].d_name); printdaemonflags(&Daemons[NDaemons]); sm_dprintf("\n"); } ++NDaemons; return true; } /* ** INITDAEMON -- initialize daemon if not yet done. ** ** Parameters: ** none ** ** Returns: ** none ** ** Side Effects: ** initializes structure for one daemon. */ void initdaemon() { if (NDaemons == 0) { Daemons[NDaemons].d_socket = -1; Daemons[NDaemons].d_listenqueue = DEF_LISTENQUEUE; Daemons[NDaemons].d_name = "Daemon0"; NDaemons = 1; } } /* ** SETCLIENTOPTIONS -- set options for running the client ** ** Parameters: ** p -- the options line. ** ** Returns: ** none. */ static DAEMON_T ClientSettings[AF_MAX + 1]; void setclientoptions(p) register char *p; { int family; DAEMON_T d; memset(&d, '\0', sizeof(d)); setsockaddroptions(p, &d); /* grab what we need */ family = d.d_addr.sa.sa_family; STRUCTCOPY(d, ClientSettings[family]); setbitn(D_ISSET, ClientSettings[family].d_flags); /* mark as set */ if (d.d_name != NULL) ClientSettings[family].d_name = newstr(d.d_name); else { char num[30]; (void) sm_snprintf(num, sizeof(num), "Client%d", family); ClientSettings[family].d_name = newstr(num); } } /* ** ADDR_FAMILY -- determine address family from address ** ** Parameters: ** addr -- the string representation of the address ** ** Returns: ** AF_INET, AF_INET6 or AF_UNSPEC ** ** Side Effects: ** none. */ static int addr_family(addr) char *addr; { #if NETINET6 SOCKADDR clt_addr; #endif #if NETINET if (inet_addr(addr) != INADDR_NONE) { if (tTd(16, 9)) sm_dprintf("addr_family(%s): INET\n", addr); return AF_INET; } #endif /* NETINET */ #if NETINET6 if (anynet_pton(AF_INET6, addr, &clt_addr.sin6.sin6_addr) == 1) { if (tTd(16, 9)) sm_dprintf("addr_family(%s): INET6\n", addr); return AF_INET6; } #endif /* NETINET6 */ #if NETUNIX if (*addr == '/') { if (tTd(16, 9)) sm_dprintf("addr_family(%s): LOCAL\n", addr); return AF_UNIX; } #endif /* NETUNIX */ if (tTd(16, 9)) sm_dprintf("addr_family(%s): UNSPEC\n", addr); return AF_UNSPEC; } /* ** CHKCLIENTMODIFIERS -- check whether all clients have set a flag. ** ** Parameters: ** flag -- the flag to test. ** ** Returns: ** true iff all configured clients have set the flag. */ bool chkclientmodifiers(flag) int flag; { int i; bool flagisset; flagisset = false; for (i = 0; i < AF_MAX; i++) { if (bitnset(D_ISSET, ClientSettings[i].d_flags)) { if (!bitnset((char) flag, ClientSettings[i].d_flags)) return false; flagisset = true; } } return flagisset; } #if MILTER /* ** SETUP_DAEMON_MILTERS -- Parse per-socket filters ** ** Parameters: ** none ** ** Returns: ** none */ void setup_daemon_milters() { int idx; if (OpMode == MD_SMTP) { /* no need to configure the daemons */ return; } for (idx = 0; idx < NDaemons; idx++) { if (Daemons[idx].d_inputfilterlist != NULL) { milter_config(Daemons[idx].d_inputfilterlist, Daemons[idx].d_inputfilters, MAXFILTERS); } } } #endif /* MILTER */ /* ** MAKECONNECTION -- make a connection to an SMTP socket on a machine. ** ** Parameters: ** host -- the name of the host. ** port -- the port number to connect to. ** mci -- a pointer to the mail connection information ** structure to be filled in. ** e -- the current envelope. ** enough -- time at which to stop further connection attempts. ** (0 means no limit) ** ** Returns: ** An exit code telling whether the connection could be ** made and if not why not. ** ** Side Effects: ** none. */ static jmp_buf CtxConnectTimeout; SOCKADDR CurHostAddr; /* address of current host */ int makeconnection(host, port, mci, e, enough #if DANE , ptlsa_flags #endif ) char *host; volatile unsigned int port; register MCI *mci; ENVELOPE *e; time_t enough; #if DANE unsigned long *ptlsa_flags; #endif { register volatile int addrno = 0; volatile int s; register struct hostent *volatile hp = (struct hostent *) NULL; SOCKADDR addr; SOCKADDR clt_addr; int save_errno = 0; volatile SOCKADDR_LEN_T addrlen; volatile bool firstconnect = true; SM_EVENT *volatile ev = NULL; #if NETINET6 volatile bool v6found = false; #endif volatile int family = InetMode; SOCKADDR_LEN_T len; volatile SOCKADDR_LEN_T socksize = 0; volatile bool clt_bind; BITMAP256 d_flags; char *p; extern ENVELOPE BlankEnvelope; #if DANE unsigned long tlsa_flags; #endif #if DANE && NETINET6 struct hostent *volatile hs = (struct hostent *) NULL; #else # define hs ((struct hostent *) NULL) #endif #if DANE SM_REQUIRE(ptlsa_flags != NULL); tlsa_flags = *ptlsa_flags; *ptlsa_flags &= ~(TLSAFLALWAYS|TLSAFLSECURE); #endif /* retranslate {daemon_flags} into bitmap */ clrbitmap(d_flags); if ((p = macvalue(macid("{daemon_flags}"), e)) != NULL) { for (; *p != '\0'; p++) { if (!(SM_ISSPACE(*p))) setbitn(bitidx(*p), d_flags); } } #if NETINET6 v4retry: #endif clt_bind = false; /* Set up the address for outgoing connection. */ if (bitnset(D_BINDIF, d_flags) && (p = macvalue(macid("{if_addr}"), e)) != NULL && *p != '\0') { #if NETINET6 char p6[INET6_ADDRSTRLEN]; #endif memset(&clt_addr, '\0', sizeof(clt_addr)); /* infer the address family from the address itself */ clt_addr.sa.sa_family = addr_family(p); switch (clt_addr.sa.sa_family) { #if NETINET case AF_INET: clt_addr.sin.sin_addr.s_addr = inet_addr(p); if (clt_addr.sin.sin_addr.s_addr != INADDR_NONE && clt_addr.sin.sin_addr.s_addr != htonl(INADDR_LOOPBACK)) { clt_bind = true; socksize = sizeof(struct sockaddr_in); } break; #endif /* NETINET */ #if NETINET6 case AF_INET6: if (inet_addr(p) != INADDR_NONE) (void) sm_snprintf(p6, sizeof(p6), "IPv6:::ffff:%s", p); else (void) sm_strlcpy(p6, p, sizeof(p6)); if (anynet_pton(AF_INET6, p6, &clt_addr.sin6.sin6_addr) == 1 && !IN6_IS_ADDR_LOOPBACK(&clt_addr.sin6.sin6_addr)) { clt_bind = true; socksize = sizeof(struct sockaddr_in6); } break; #endif /* NETINET6 */ #if 0 default: syserr("554 5.3.5 Address= option unsupported for family %d", clt_addr.sa.sa_family); break; #endif /* 0 */ } if (clt_bind) family = clt_addr.sa.sa_family; } /* D_BINDIF not set or not available, fallback to ClientPortOptions */ if (!clt_bind) { STRUCTCOPY(ClientSettings[family].d_addr, clt_addr); switch (clt_addr.sa.sa_family) { #if NETINET case AF_INET: if (clt_addr.sin.sin_addr.s_addr == 0) clt_addr.sin.sin_addr.s_addr = LocalDaemon ? htonl(INADDR_LOOPBACK) : INADDR_ANY; else clt_bind = true; if (clt_addr.sin.sin_port != 0) clt_bind = true; socksize = sizeof(struct sockaddr_in); break; #endif /* NETINET */ #if NETINET6 case AF_INET6: if (IN6_IS_ADDR_UNSPECIFIED(&clt_addr.sin6.sin6_addr)) clt_addr.sin6.sin6_addr = (LocalDaemon && V6LoopbackAddrFound) ? in6addr_loopback : in6addr_any; else clt_bind = true; socksize = sizeof(struct sockaddr_in6); if (clt_addr.sin6.sin6_port != 0) clt_bind = true; break; #endif /* NETINET6 */ #if NETISO case AF_ISO: socksize = sizeof(clt_addr.siso); clt_bind = true; break; #endif /* NETISO */ default: break; } } /* ** Set up the address for the mailer. ** Accept "[a.b.c.d]" syntax for host name. */ SM_SET_H_ERRNO(0); errno = 0; memset(&CurHostAddr, '\0', sizeof(CurHostAddr)); memset(&addr, '\0', sizeof(addr)); SmtpPhase = mci->mci_phase = "initial connection"; CurHostName = host; if (host[0] == '[') { p = strchr(host, ']'); if (p != NULL) { #if NETINET unsigned long hid = INADDR_NONE; #endif #if NETINET6 struct sockaddr_in6 hid6; #endif *p = '\0'; #if NETINET6 memset(&hid6, '\0', sizeof(hid6)); #endif #if NETINET if (family == AF_INET && (hid = inet_addr(&host[1])) != INADDR_NONE) { addr.sin.sin_family = AF_INET; addr.sin.sin_addr.s_addr = hid; } else #endif /* NETINET */ #if NETINET6 if (family == AF_INET6 && anynet_pton(AF_INET6, &host[1], &hid6.sin6_addr) == 1) { addr.sin6.sin6_family = AF_INET6; addr.sin6.sin6_addr = hid6.sin6_addr; } else #endif /* NETINET6 */ { /* try it as a host name (avoid MX lookup) */ hp = sm_gethostbyname(&host[1], family); if (hp == NULL && p[-1] == '.') { #if NAMED_BIND int oldopts = _res.options; _res.options &= ~(RES_DEFNAMES|RES_DNSRCH); #endif /* NAMED_BIND */ p[-1] = '\0'; hp = sm_gethostbyname(&host[1], family); p[-1] = '.'; #if NAMED_BIND _res.options = oldopts; #endif } *p = ']'; goto gothostent; } *p = ']'; } if (p == NULL) { extern char MsgBuf[]; usrerrenh("5.1.2", "553 Invalid numeric domain spec \"%s\"", host); mci_setstat(mci, EX_NOHOST, "5.1.2", MsgBuf); errno = EINVAL; return EX_NOHOST; } } else { /* contortion to get around SGI cc complaints */ { p = &host[strlen(host) - 1]; #if DANE if (tTd(16, 40)) sm_dprintf("makeconnection: tlsa_flags=%lX, host=%s\n", tlsa_flags, host); if (DANEMODE(tlsa_flags) == DANE_SECURE # if DNSSEC_TEST || tTd(8, 120) # endif ) { DNS_REPLY_T *rr; int err, herr; rr = dns_lookup_int(host, C_IN, FAM2T_(family), 0, 0, SM_RES_DNSSEC, 0, &err, &herr); /* ** Check for errors! ** If no ad: turn off TLSA. ** permail: use "normal" method? ** tempfail: delay or use "normal" method? */ if (rr != NULL && rr->dns_r_h.ad == 1) { *ptlsa_flags |= DANE_SECURE; if ((TLSAFLTEMP & *ptlsa_flags) != 0) { dns_free_data(rr); rr = NULL; return EX_TEMPFAIL; } hp = dns2he(rr, family); #if NETINET6 hs = hp; #endif } /* other possible "tempfails"? */ if (rr == NULL && h_errno == TRY_AGAIN) goto gothostent; dns_free_data(rr); rr = NULL; } #endif if (hp == NULL) hp = sm_gethostbyname(host, family); if (hp == NULL && *p == '.') { #if NAMED_BIND int oldopts = _res.options; _res.options &= ~(RES_DEFNAMES|RES_DNSRCH); #endif *p = '\0'; hp = sm_gethostbyname(host, family); *p = '.'; #if NAMED_BIND _res.options = oldopts; #endif } } gothostent: if (hp == NULL || hp->h_addr == NULL) { #if NAMED_BIND /* check for name server timeouts */ # if NETINET6 if (WorkAroundBrokenAAAA && family == AF_INET6 && (h_errno == TRY_AGAIN || errno == ETIMEDOUT)) { /* ** An attempt with family AF_INET may ** succeed. By skipping the next section ** of code, we will try AF_INET before ** failing. */ if (tTd(16, 10)) sm_dprintf("makeconnection: WorkAroundBrokenAAAA: Trying AF_INET lookup (AF_INET6 failed)\n"); } else # endif /* NETINET6 */ { if (errno == ETIMEDOUT || # if _FFR_GETHBN_ExFILE # ifdef EMFILE errno == EMFILE || # endif # ifdef ENFILE errno == ENFILE || # endif # endif /* _FFR_GETHBN_ExFILE */ h_errno == TRY_AGAIN || (errno == ECONNREFUSED && UseNameServer)) { save_errno = errno; mci_setstat(mci, EX_TEMPFAIL, "4.4.3", NULL); errno = save_errno; return EX_TEMPFAIL; } } #endif /* NAMED_BIND */ #if NETINET6 /* ** Try v6 first, then fall back to v4. ** If we found a v6 address, but no v4 ** addresses, then TEMPFAIL. */ if (family == AF_INET6) { family = AF_INET; goto v4retry; } if (v6found) goto v6tempfail; #endif /* NETINET6 */ save_errno = errno; mci_setstat(mci, EX_NOHOST, "5.1.2", NULL); errno = save_errno; return EX_NOHOST; } addr.sa.sa_family = hp->h_addrtype; switch (hp->h_addrtype) { #if NETINET case AF_INET: memmove(&addr.sin.sin_addr, hp->h_addr, INADDRSZ); break; #endif /* NETINET */ #if NETINET6 case AF_INET6: memmove(&addr.sin6.sin6_addr, hp->h_addr, IN6ADDRSZ); break; #endif /* NETINET6 */ default: if (hp->h_length > sizeof(addr.sa.sa_data)) { syserr("makeconnection: long sa_data: family %d len %d", hp->h_addrtype, hp->h_length); mci_setstat(mci, EX_NOHOST, "5.1.2", NULL); errno = EINVAL; return EX_NOHOST; } memmove(addr.sa.sa_data, hp->h_addr, hp->h_length); break; } addrno = 1; } #if _FFR_TESTS /* ** Hack for testing. ** Hardcoded: ** 10.1.1.12: see meta1.tns XREF IP address ** 8754: see common.sh XREF SNKPORT2 */ if (tTd(77, 101) && hp->h_addrtype == AF_INET && addr.sin.sin_addr.s_addr == inet_addr("10.1.1.12")) { addr.sin.sin_addr.s_addr = inet_addr("127.0.0.1"); port = htons(8754); sm_dprintf("hack host=%s addr=[%s].%d\n", host, anynet_ntoa(&addr), ntohs(port)); } #endif /* ** Determine the port number. */ if (port == 0) { #ifdef NO_GETSERVBYNAME port = htons(25); #else /* NO_GETSERVBYNAME */ register struct servent *sp = getservbyname("smtp", "tcp"); if (sp == NULL) { if (LogLevel > 2) sm_syslog(LOG_ERR, NOQID, "makeconnection: service \"smtp\" unknown"); port = htons(25); } else port = sp->s_port; #endif /* NO_GETSERVBYNAME */ } #if NETINET6 if (addr.sa.sa_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&addr.sin6.sin6_addr) && ClientSettings[AF_INET].d_addr.sa.sa_family != 0) { /* ** Ignore mapped IPv4 address since ** there is a ClientPortOptions setting ** for IPv4. */ goto nextaddr; } #endif /* NETINET6 */ switch (addr.sa.sa_family) { #if NETINET case AF_INET: addr.sin.sin_port = port; addrlen = sizeof(struct sockaddr_in); break; #endif /* NETINET */ #if NETINET6 case AF_INET6: addr.sin6.sin6_port = port; addrlen = sizeof(struct sockaddr_in6); break; #endif /* NETINET6 */ #if NETISO case AF_ISO: /* assume two byte transport selector */ memmove(TSEL((struct sockaddr_iso *) &addr), (char *) &port, 2); addrlen = sizeof(struct sockaddr_iso); break; #endif /* NETISO */ default: syserr("Can't connect to address family %d", addr.sa.sa_family); mci_setstat(mci, EX_NOHOST, "5.1.2", NULL); errno = EINVAL; FREEHOSTENT(hp, hs); return EX_NOHOST; } /* ** Try to actually open the connection. */ #if XLA /* if too many connections, don't bother trying */ if (!xla_noqueue_ok(host)) { FREEHOSTENT(hp, hs); return EX_TEMPFAIL; } #endif /* XLA */ #if _FFR_OCC # define OCC_CLOSE occ_close(e, mci, host, &addr) /* HACK!!!! just to see if this can work at all... */ if (occ_exceeded(e, mci, host, &addr)) { FREEHOSTENT(hp, hs); sm_syslog(LOG_DEBUG, e->e_id, "stat=occ_exceeded, host=%s, addr=%s", host, anynet_ntoa(&addr)); /* ** to get a more specific stat= message set errno ** or make up one in sm, see sm_errstring() */ mci_setstat(mci, EX_TEMPFAIL, "4.4.5", "450 occ_exceeded"); /* check D.S.N */ errno = EAGAIN; return EX_TEMPFAIL; } #else /* _FFR_OCC */ # define OCC_CLOSE #endif /* _FFR_OCC */ for (;;) { if (tTd(16, 1)) sm_dprintf("makeconnection (%s [%s].%d (%d))\n", host, anynet_ntoa(&addr), ntohs(port), (int) addr.sa.sa_family); /* save for logging */ CurHostAddr = addr; #if HASRRESVPORT if (bitnset(M_SECURE_PORT, mci->mci_mailer->m_flags)) { int rport = IPPORT_RESERVED - 1; s = rresvport(&rport); } else #endif /* HASRRESVPORT */ { s = socket(addr.sa.sa_family, SOCK_STREAM, 0); } if (s < 0) { save_errno = errno; syserr("makeconnection: cannot create socket"); #if XLA xla_host_end(host); #endif mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL); FREEHOSTENT(hp, hs); errno = save_errno; OCC_CLOSE; return EX_TEMPFAIL; } #ifdef SO_SNDBUF if (ClientSettings[family].d_tcpsndbufsize > 0) { if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *) &ClientSettings[family].d_tcpsndbufsize, sizeof(ClientSettings[family].d_tcpsndbufsize)) < 0) syserr("makeconnection: setsockopt(SO_SNDBUF)"); } #endif /* SO_SNDBUF */ #ifdef SO_RCVBUF if (ClientSettings[family].d_tcprcvbufsize > 0) { if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *) &ClientSettings[family].d_tcprcvbufsize, sizeof(ClientSettings[family].d_tcprcvbufsize)) < 0) syserr("makeconnection: setsockopt(SO_RCVBUF)"); } #endif /* SO_RCVBUF */ if (tTd(16, 1)) sm_dprintf("makeconnection: fd=%d\n", s); /* turn on network debugging? */ if (tTd(16, 101)) { int on = 1; (void) setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&on, sizeof(on)); } if (e->e_xfp != NULL) /* for debugging */ (void) sm_io_flush(e->e_xfp, SM_TIME_DEFAULT); errno = 0; /* for debugging */ if (clt_bind) { int on = 1; switch (clt_addr.sa.sa_family) { #if NETINET case AF_INET: if (clt_addr.sin.sin_port != 0) (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)); break; #endif /* NETINET */ #if NETINET6 case AF_INET6: if (clt_addr.sin6.sin6_port != 0) (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)); break; #endif /* NETINET6 */ } if (bind(s, &clt_addr.sa, socksize) < 0) { save_errno = errno; (void) close(s); errno = save_errno; syserr("makeconnection: cannot bind socket [%s]", anynet_ntoa(&clt_addr)); FREEHOSTENT(hp, hs); errno = save_errno; OCC_CLOSE; return EX_TEMPFAIL; } } /* ** Linux seems to hang in connect for 90 minutes (!!!). ** Time out the connect to avoid this problem. */ if (setjmp(CtxConnectTimeout) == 0) { int i; if (e->e_ntries <= 0 && TimeOuts.to_iconnect != 0) ev = sm_setevent(TimeOuts.to_iconnect, connecttimeout, 0); else if (TimeOuts.to_connect != 0) ev = sm_setevent(TimeOuts.to_connect, connecttimeout, 0); else ev = NULL; switch (ConnectOnlyTo.sa.sa_family) { #if NETINET case AF_INET: addr.sin.sin_addr.s_addr = ConnectOnlyTo.sin.sin_addr.s_addr; addr.sa.sa_family = ConnectOnlyTo.sa.sa_family; if (ConnectOnlyTo.sin.sin_port != 0) { port = ConnectOnlyTo.sin.sin_port; addr.sin.sin_port = port; } break; #endif /* NETINET */ #if NETINET6 case AF_INET6: memmove(&addr.sin6.sin6_addr, &ConnectOnlyTo.sin6.sin6_addr, IN6ADDRSZ); if (ConnectOnlyTo.sin6.sin6_port != 0) { port = ConnectOnlyTo.sin6.sin6_port; addr.sin6.sin6_port = port; } break; #endif /* NETINET6 */ } if (tTd(16, 1)) sm_dprintf("Connecting to [%s].%d...\n", anynet_ntoa(&addr), ntohs(port)); i = connect(s, (struct sockaddr *) &addr, addrlen); save_errno = errno; if (ev != NULL) sm_clrevent(ev); if (i >= 0) break; } else save_errno = errno; /* couldn't connect.... figure out why */ (void) close(s); /* if running demand-dialed connection, try again */ if (DialDelay > 0 && firstconnect && bitnset(M_DIALDELAY, mci->mci_mailer->m_flags)) { if (tTd(16, 1)) sm_dprintf("Connect failed (%s); trying again...\n", sm_errstring(save_errno)); firstconnect = false; (void) sleep(DialDelay); continue; } if (LogLevel > 13) sm_syslog(LOG_INFO, e->e_id, "makeconnection (%s [%s].%d (%d)) failed: %s", host, anynet_ntoa(&addr), ntohs(port), (int) addr.sa.sa_family, sm_errstring(save_errno)); #if NETINET6 nextaddr: #endif /* NETINET6 */ if (hp != NULL && hp->h_addr_list[addrno] != NULL && (enough == 0 || curtime() < enough)) { if (tTd(16, 1)) sm_dprintf("Connect failed (%s); trying new address....\n", sm_errstring(save_errno)); switch (addr.sa.sa_family) { #if NETINET case AF_INET: memmove(&addr.sin.sin_addr, hp->h_addr_list[addrno++], INADDRSZ); break; #endif /* NETINET */ #if NETINET6 case AF_INET6: memmove(&addr.sin6.sin6_addr, hp->h_addr_list[addrno++], IN6ADDRSZ); break; #endif /* NETINET6 */ default: memmove(addr.sa.sa_data, hp->h_addr_list[addrno++], hp->h_length); break; } continue; } errno = save_errno; #if NETINET6 if (family == AF_INET6) { if (tTd(16, 1)) sm_dprintf("Connect failed (%s); retrying with AF_INET....\n", sm_errstring(save_errno)); v6found = true; family = AF_INET; FREEHOSTENT(hp, hs); goto v4retry; } v6tempfail: #endif /* NETINET6 */ /* couldn't open connection */ #if NETINET6 /* Don't clobber an already saved errno from v4retry */ if (errno > 0) #endif save_errno = errno; if (tTd(16, 1)) sm_dprintf("Connect failed (%s)\n", sm_errstring(save_errno)); #if XLA xla_host_end(host); #endif mci_setstat(mci, EX_TEMPFAIL, "4.4.1", NULL); FREEHOSTENT(hp, hs); errno = save_errno; OCC_CLOSE; return EX_TEMPFAIL; } FREEHOSTENT(hp, hs); /* connection ok, put it into canonical form */ mci->mci_out = NULL; if ((mci->mci_out = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &s, SM_IO_WRONLY_B, NULL)) == NULL || (s = dup(s)) < 0 || (mci->mci_in = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &s, SM_IO_RDONLY_B, NULL)) == NULL) { save_errno = errno; syserr("cannot open SMTP client channel, fd=%d", s); mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL); if (mci->mci_out != NULL) (void) sm_io_close(mci->mci_out, SM_TIME_DEFAULT); (void) close(s); errno = save_errno; OCC_CLOSE; return EX_TEMPFAIL; } sm_io_automode(mci->mci_out, mci->mci_in); /* set {client_flags} */ if (ClientSettings[addr.sa.sa_family].d_mflags != NULL) { macdefine(&mci->mci_macro, A_PERM, macid("{client_flags}"), ClientSettings[addr.sa.sa_family].d_mflags); } else macdefine(&mci->mci_macro, A_PERM, macid("{client_flags}"), ""); /* "add" {client_flags} to bitmap */ if (bitnset(D_IFNHELO, ClientSettings[addr.sa.sa_family].d_flags)) { /* look for just this one flag */ setbitn(D_IFNHELO, d_flags); } /* find out name for Interface through which we connect */ len = sizeof(addr); if (getsockname(s, &addr.sa, &len) == 0) { char *name; if (!isloopback(addr)) { char familystr[5]; macdefine(&BlankEnvelope.e_macro, A_TEMP, macid("{if_addr_out}"), anynet_ntoa(&addr)); (void) sm_snprintf(familystr, sizeof(familystr), "%d", addr.sa.sa_family); macdefine(&BlankEnvelope.e_macro, A_TEMP, macid("{if_family_out}"), familystr); } else { macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_addr_out}"), NULL); macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_family_out}"), NULL); } name = hostnamebyanyaddr(&addr); macdefine(&BlankEnvelope.e_macro, A_TEMP, macid("{if_name_out}"), name); if (LogLevel > 11) { /* log connection information */ sm_syslog(LOG_INFO, e->e_id, "SMTP outgoing connect on %.40s", name); } if (bitnset(D_IFNHELO, d_flags)) { if (name[0] != '[' && strchr(name, '.') != NULL) mci->mci_heloname = newstr(name); } } else { macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_name_out}"), NULL); macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_addr_out}"), NULL); macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{if_family_out}"), NULL); } /* Use the configured HeloName as appropriate */ if (HeloName != NULL && HeloName[0] != '\0') { SM_FREE(mci->mci_heloname); mci->mci_heloname = newstr(HeloName); } mci_setstat(mci, EX_OK, NULL, NULL); return EX_OK; } static void connecttimeout(ignore) int ignore; { /* ** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD ** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE ** DOING. */ errno = ETIMEDOUT; longjmp(CtxConnectTimeout, 1); } /* ** MAKECONNECTION_DS -- make a connection to a domain socket. ** ** Parameters: ** mux_path -- the path of the socket to connect to. ** mci -- a pointer to the mail connection information ** structure to be filled in. ** ** Returns: ** An exit code telling whether the connection could be ** made and if not why not. ** ** Side Effects: ** none. */ #if NETUNIX int makeconnection_ds(mux_path, mci) char *mux_path; register MCI *mci; { int sock; int rval, save_errno; long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_ROOTOK|SFF_EXECOK; struct sockaddr_un unix_addr; /* if not safe, don't connect */ rval = safefile(mux_path, RunAsUid, RunAsGid, RunAsUserName, sff, S_IRUSR|S_IWUSR, NULL); if (rval != 0) { syserr("makeconnection_ds: unsafe domain socket %s", mux_path); mci_setstat(mci, EX_TEMPFAIL, "4.3.5", NULL); errno = rval; return EX_TEMPFAIL; } /* prepare address structure */ memset(&unix_addr, '\0', sizeof(unix_addr)); unix_addr.sun_family = AF_UNIX; if (strlen(mux_path) >= sizeof(unix_addr.sun_path)) { syserr("makeconnection_ds: domain socket name %s too long", mux_path); /* XXX why TEMPFAIL but 5.x.y ? */ mci_setstat(mci, EX_TEMPFAIL, "5.3.5", NULL); errno = ENAMETOOLONG; return EX_UNAVAILABLE; } (void) sm_strlcpy(unix_addr.sun_path, mux_path, sizeof(unix_addr.sun_path)); /* initialize domain socket */ sock = socket(AF_UNIX, SOCK_STREAM, 0); if (sock == -1) { save_errno = errno; syserr("makeconnection_ds: could not create domain socket %s", mux_path); mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL); errno = save_errno; return EX_TEMPFAIL; } /* connect to server */ if (connect(sock, (struct sockaddr *) &unix_addr, sizeof(unix_addr)) == -1) { save_errno = errno; syserr("Could not connect to socket %s", mux_path); mci_setstat(mci, EX_TEMPFAIL, "4.4.1", NULL); (void) close(sock); errno = save_errno; return EX_TEMPFAIL; } /* connection ok, put it into canonical form */ mci->mci_out = NULL; if ((mci->mci_out = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &sock, SM_IO_WRONLY_B, NULL)) == NULL || (sock = dup(sock)) < 0 || (mci->mci_in = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &sock, SM_IO_RDONLY_B, NULL)) == NULL) { save_errno = errno; syserr("cannot open SMTP client channel, fd=%d", sock); mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL); if (mci->mci_out != NULL) (void) sm_io_close(mci->mci_out, SM_TIME_DEFAULT); (void) close(sock); errno = save_errno; return EX_TEMPFAIL; } sm_io_automode(mci->mci_out, mci->mci_in); mci_setstat(mci, EX_OK, NULL, NULL); errno = 0; return EX_OK; } #endif /* NETUNIX */ /* ** SHUTDOWN_DAEMON -- Performs a clean shutdown of the daemon ** ** Parameters: ** none. ** ** Returns: ** none. ** ** Side Effects: ** closes control socket, exits. */ void shutdown_daemon() { int i; char *reason; sm_allsignals(true); reason = ShutdownRequest; ShutdownRequest = NULL; PendingSignal = 0; if (LogLevel > 9) sm_syslog(LOG_INFO, CurEnv->e_id, "stopping daemon, reason=%s", reason == NULL ? "implicit call" : reason); FileName = NULL; closecontrolsocket(true); #if XLA xla_all_end(); #endif for (i = 0; i < NDaemons; i++) { if (Daemons[i].d_socket >= 0) { (void) close(Daemons[i].d_socket); Daemons[i].d_socket = -1; #if NETUNIX /* Remove named sockets */ if (Daemons[i].d_addr.sa.sa_family == AF_UNIX) { int rval; long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_MUSTOWN|SFF_EXECOK|SFF_CREAT; /* if not safe, don't use it */ rval = safefile(Daemons[i].d_addr.sunix.sun_path, RunAsUid, RunAsGid, RunAsUserName, sff, S_IRUSR|S_IWUSR, NULL); if (rval == 0 && unlink(Daemons[i].d_addr.sunix.sun_path) < 0) { sm_syslog(LOG_WARNING, NOQID, "Could not remove daemon %s socket: %s: %s", Daemons[i].d_name, Daemons[i].d_addr.sunix.sun_path, sm_errstring(errno)); } } #endif /* NETUNIX */ } } finis(false, true, EX_OK); } /* ** RESTART_DAEMON -- Performs a clean restart of the daemon ** ** Parameters: ** none. ** ** Returns: ** none. ** ** Side Effects: ** restarts the daemon or exits if restart fails. */ /* Make a non-DFL/IGN signal a noop */ #define SM_NOOP_SIGNAL(sig, old) \ do \ { \ (old) = sm_signal((sig), sm_signal_noop); \ if ((old) == SIG_IGN || (old) == SIG_DFL) \ (void) sm_signal((sig), (old)); \ } while (0) void restart_daemon() { bool drop; int save_errno; char *reason; sigfunc_t ignore, oalrm, ousr1; extern int DtableSize; /* clear the events to turn off SIGALRMs */ sm_clear_events(); sm_allsignals(true); reason = RestartRequest; RestartRequest = NULL; PendingSignal = 0; if (SaveArgv[0][0] != '/') { if (LogLevel > 3) sm_syslog(LOG_INFO, NOQID, "could not restart: need full path"); finis(false, true, EX_OSFILE); /* NOTREACHED */ } if (LogLevel > 3) sm_syslog(LOG_INFO, NOQID, "restarting %s due to %s", SaveArgv[0], reason == NULL ? "implicit call" : reason); closecontrolsocket(true); #if SM_CONF_SHM cleanup_shm(DaemonPid == getpid()); #endif /* close locked pid file */ close_sendmail_pid(); /* ** Want to drop to the user who started the process in all cases ** *but* when running as "smmsp" for the clientmqueue queue run ** daemon. In that case, UseMSP will be true, RunAsUid should not ** be root, and RealUid should be either 0 or RunAsUid. */ drop = !(UseMSP && RunAsUid != 0 && (RealUid == 0 || RealUid == RunAsUid)); if (drop_privileges(drop) != EX_OK) { if (LogLevel > 0) sm_syslog(LOG_ALERT, NOQID, "could not drop privileges: %s", sm_errstring(errno)); finis(false, true, EX_OSERR); /* NOTREACHED */ } sm_close_on_exec(STDERR_FILENO + 1, DtableSize); /* ** Need to allow signals before execve() to make them "harmless". ** However, the default action can be "terminate", so it isn't ** really harmless. Setting signals to IGN will cause them to be ** ignored in the new process to, so that isn't a good alternative. */ SM_NOOP_SIGNAL(SIGALRM, oalrm); SM_NOOP_SIGNAL(SIGCHLD, ignore); SM_NOOP_SIGNAL(SIGHUP, ignore); SM_NOOP_SIGNAL(SIGINT, ignore); SM_NOOP_SIGNAL(SIGPIPE, ignore); SM_NOOP_SIGNAL(SIGTERM, ignore); #ifdef SIGUSR1 SM_NOOP_SIGNAL(SIGUSR1, ousr1); #endif /* Turn back on signals */ sm_allsignals(false); (void) execve(SaveArgv[0], (ARGV_T) SaveArgv, (ARGV_T) ExternalEnviron); save_errno = errno; /* block signals again and restore needed signals */ sm_allsignals(true); /* For finis() events */ (void) sm_signal(SIGALRM, oalrm); #ifdef SIGUSR1 /* For debugging finis() */ (void) sm_signal(SIGUSR1, ousr1); #endif errno = save_errno; if (LogLevel > 0) sm_syslog(LOG_ALERT, NOQID, "could not exec %s: %s", SaveArgv[0], sm_errstring(errno)); finis(false, true, EX_OSFILE); /* NOTREACHED */ } /* ** MYHOSTNAME -- return the name of this host. ** ** Parameters: ** hostbuf -- a place to return the name of this host. ** size -- the size of hostbuf. ** ** Returns: ** A list of aliases for this host. ** ** Side Effects: ** Adds numeric codes to $=w. */ struct hostent * myhostname(hostbuf, size) char hostbuf[]; int size; { register struct hostent *hp; if (gethostname(hostbuf, size) < 0 || hostbuf[0] == '\0') (void) sm_strlcpy(hostbuf, "localhost", size); hp = sm_gethostbyname(hostbuf, InetMode); #if NETINET && NETINET6 if (hp == NULL && InetMode == AF_INET6) { /* ** It's possible that this IPv6 enabled machine doesn't ** actually have any IPv6 interfaces and, therefore, no ** IPv6 addresses. Fall back to AF_INET. */ hp = sm_gethostbyname(hostbuf, AF_INET); } #endif /* NETINET && NETINET6 */ if (hp == NULL) return NULL; if (strchr(hp->h_name, '.') != NULL || strchr(hostbuf, '.') == NULL) (void) cleanstrcpy(hostbuf, hp->h_name, size); #if NETINFO if (strchr(hostbuf, '.') == NULL) { char *domainname; domainname = ni_propval("/locations", NULL, "resolver", "domain", '\0'); if (domainname != NULL && strlen(domainname) + strlen(hostbuf) + 1 < size) (void) sm_strlcat2(hostbuf, ".", domainname, size); } #endif /* NETINFO */ /* ** If there is still no dot in the name, try looking for a ** dotted alias. */ if (strchr(hostbuf, '.') == NULL) { char **ha; for (ha = hp->h_aliases; ha != NULL && *ha != NULL; ha++) { if (strchr(*ha, '.') != NULL) { (void) cleanstrcpy(hostbuf, *ha, size - 1); hostbuf[size - 1] = '\0'; break; } } } /* ** If _still_ no dot, wait for a while and try again -- it is ** possible that some service is starting up. This can result ** in excessive delays if the system is badly configured, but ** there really isn't a way around that, particularly given that ** the config file hasn't been read at this point. ** All in all, a bit of a mess. */ if (strchr(hostbuf, '.') == NULL && getcanonname(hostbuf, size, true, NULL) == HOST_NOTFOUND) { sm_syslog(LocalDaemon ? LOG_WARNING : LOG_CRIT, NOQID, "My unqualified host name (%s) unknown; sleeping for retry", hostbuf); message("My unqualified host name (%s) unknown; sleeping for retry", hostbuf); (void) sleep(60); if (getcanonname(hostbuf, size, true, NULL) == HOST_NOTFOUND) { sm_syslog(LocalDaemon ? LOG_WARNING : LOG_ALERT, NOQID, "unable to qualify my own domain name (%s) -- using short name", hostbuf); message("WARNING: unable to qualify my own domain name (%s) -- using short name", hostbuf); } } return hp; } /* ** ADDRCMP -- compare two host addresses ** ** Parameters: ** hp -- hostent structure for the first address ** ha -- actual first address ** sa -- second address ** ** Returns: ** 0 -- if ha and sa match ** else -- they don't match */ static int addrcmp(hp, ha, sa) struct hostent *hp; char *ha; SOCKADDR *sa; { #if NETINET6 unsigned char *a; #endif switch (sa->sa.sa_family) { #if NETINET case AF_INET: if (hp->h_addrtype == AF_INET) return memcmp(ha, (char *) &sa->sin.sin_addr, INADDRSZ); break; #endif #if NETINET6 case AF_INET6: a = (unsigned char *) &sa->sin6.sin6_addr; /* Straight binary comparison */ if (hp->h_addrtype == AF_INET6) return memcmp(ha, a, IN6ADDRSZ); /* If IPv4-mapped IPv6 address, compare the IPv4 section */ if (hp->h_addrtype == AF_INET && IN6_IS_ADDR_V4MAPPED(&sa->sin6.sin6_addr)) return memcmp(a + IN6ADDRSZ - INADDRSZ, ha, INADDRSZ); break; #endif /* NETINET6 */ } return -1; } /* ** GETAUTHINFO -- get the real host name associated with a file descriptor ** ** Uses RFC1413 protocol to try to get info from the other end. ** ** Parameters: ** fd -- the descriptor ** may_be_forged -- an outage that is set to true if the ** forward lookup of RealHostName does not match ** RealHostAddr; set to false if they do match. ** ** Returns: ** The user@host information associated with this descriptor. */ static jmp_buf CtxAuthTimeout; static void authtimeout(ignore) int ignore; { /* ** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD ** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE ** DOING. */ errno = ETIMEDOUT; longjmp(CtxAuthTimeout, 1); } char * getauthinfo(fd, may_be_forged) int fd; bool *may_be_forged; { unsigned short SM_NONVOLATILE port = 0; SOCKADDR_LEN_T falen; register char *volatile p = NULL; SOCKADDR la; SOCKADDR_LEN_T lalen; #ifndef NO_GETSERVBYNAME register struct servent *sp; # if NETINET static unsigned short port4 = 0; # endif # if NETINET6 static unsigned short port6 = 0; # endif #endif /* ! NO_GETSERVBYNAME */ volatile int s; int i = 0; size_t len; SM_EVENT *ev; int nleft; struct hostent *hp; char *ostype = NULL; char **ha; char ibuf[MAXNAME + 1]; static char hbuf[MAXNAME + MAXAUTHINFO + 11]; *may_be_forged = true; falen = sizeof(RealHostAddr); if (isatty(fd) || (i = getpeername(fd, &RealHostAddr.sa, &falen)) < 0 || falen <= 0 || RealHostAddr.sa.sa_family == 0) { if (i < 0) { /* ** ENOTSOCK is OK: bail on anything else, but reset ** errno in this case, so a mis-report doesn't ** happen later. */ if (errno != ENOTSOCK) return NULL; errno = 0; } *may_be_forged = false; (void) sm_strlcpyn(hbuf, sizeof(hbuf), 2, RealUserName, "@localhost"); if (tTd(9, 1)) sm_dprintf("getauthinfo: %s\n", hbuf); return hbuf; } if (RealHostName == NULL) { /* translate that to a host name */ RealHostName = newstr(hostnamebyanyaddr(&RealHostAddr)); if (strlen(RealHostName) > MAXNAME) RealHostName[MAXNAME] = '\0'; /* XXX - 1 ? */ } /* cross check RealHostName with forward DNS lookup */ if (anynet_ntoa(&RealHostAddr)[0] == '[' || RealHostName[0] == '[') *may_be_forged = false; else { int family; family = RealHostAddr.sa.sa_family; #if NETINET6 && NEEDSGETIPNODE /* ** If RealHostAddr is an IPv6 connection with an ** IPv4-mapped address, we need RealHostName's IPv4 ** address(es) for addrcmp() to compare against ** RealHostAddr. ** ** Actually, we only need to do this for systems ** which NEEDSGETIPNODE since the real getipnodebyname() ** already does V4MAPPED address via the AI_V4MAPPEDCFG ** flag. A better fix to this problem is to add this ** functionality to our stub getipnodebyname(). */ if (family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&RealHostAddr.sin6.sin6_addr)) family = AF_INET; #endif /* NETINET6 && NEEDSGETIPNODE */ /* try to match the reverse against the forward lookup */ hp = sm_gethostbyname(RealHostName, family); if (hp != NULL) { for (ha = hp->h_addr_list; *ha != NULL; ha++) { if (addrcmp(hp, *ha, &RealHostAddr) == 0) { *may_be_forged = false; break; } } FREEHOSTENT(hp, NULL); } } if (TimeOuts.to_ident == 0) goto noident; lalen = sizeof(la); switch (RealHostAddr.sa.sa_family) { #if NETINET case AF_INET: if (getsockname(fd, &la.sa, &lalen) < 0 || lalen <= 0 || la.sa.sa_family != AF_INET) { /* no ident info */ goto noident; } port = RealHostAddr.sin.sin_port; /* create ident query */ (void) sm_snprintf(ibuf, sizeof(ibuf), "%d,%d\r\n", ntohs(RealHostAddr.sin.sin_port), ntohs(la.sin.sin_port)); /* create local address */ la.sin.sin_port = 0; /* create foreign address */ # ifdef NO_GETSERVBYNAME RealHostAddr.sin.sin_port = htons(113); # else /* NO_GETSERVBYNAME */ /* ** getservbyname() consumes about 5% of the time ** when receiving a small message (almost all of the time ** spent in this routine). ** Hence we store the port in a static variable ** to save this time. ** The portnumber shouldn't change very often... ** This code makes the assumption that the port number ** is not 0. */ if (port4 == 0) { sp = getservbyname("auth", "tcp"); if (sp != NULL) port4 = sp->s_port; else port4 = htons(113); } RealHostAddr.sin.sin_port = port4; break; # endif /* NO_GETSERVBYNAME */ #endif /* NETINET */ #if NETINET6 case AF_INET6: if (getsockname(fd, &la.sa, &lalen) < 0 || lalen <= 0 || la.sa.sa_family != AF_INET6) { /* no ident info */ goto noident; } port = RealHostAddr.sin6.sin6_port; /* create ident query */ (void) sm_snprintf(ibuf, sizeof(ibuf), "%d,%d\r\n", ntohs(RealHostAddr.sin6.sin6_port), ntohs(la.sin6.sin6_port)); /* create local address */ la.sin6.sin6_port = 0; /* create foreign address */ # ifdef NO_GETSERVBYNAME RealHostAddr.sin6.sin6_port = htons(113); # else /* NO_GETSERVBYNAME */ if (port6 == 0) { sp = getservbyname("auth", "tcp"); if (sp != NULL) port6 = sp->s_port; else port6 = htons(113); } RealHostAddr.sin6.sin6_port = port6; break; # endif /* NO_GETSERVBYNAME */ #endif /* NETINET6 */ default: /* no ident info */ goto noident; } s = -1; if (setjmp(CtxAuthTimeout) != 0) { if (s >= 0) (void) close(s); goto noident; } /* put a timeout around the whole thing */ ev = sm_setevent(TimeOuts.to_ident, authtimeout, 0); /* connect to foreign IDENT server using same address as SMTP socket */ s = socket(la.sa.sa_family, SOCK_STREAM, 0); if (s < 0) { sm_clrevent(ev); goto noident; } if (bind(s, &la.sa, lalen) < 0 || connect(s, &RealHostAddr.sa, lalen) < 0) goto closeident; if (tTd(9, 10)) sm_dprintf("getauthinfo: sent %s", ibuf); /* send query */ if (write(s, ibuf, strlen(ibuf)) < 0) goto closeident; /* get result */ p = &ibuf[0]; nleft = sizeof(ibuf) - 1; while ((i = read(s, p, nleft)) > 0) { char *s; p += i; nleft -= i; *p = '\0'; if ((s = strchr(ibuf, '\n')) != NULL) { if (p > s + 1) { p = s + 1; *p = '\0'; } break; } if (nleft <= 0) break; } (void) close(s); sm_clrevent(ev); if (i < 0 || p == &ibuf[0]) goto noident; if (p >= &ibuf[2] && *--p == '\n' && *--p == '\r') p--; *++p = '\0'; if (tTd(9, 3)) sm_dprintf("getauthinfo: got %s\n", ibuf); /* parse result */ p = strchr(ibuf, ':'); if (p == NULL) { /* malformed response */ goto noident; } while (isascii(*++p) && isspace(*p)) continue; if (sm_strncasecmp(p, "userid", 6) != 0) { /* presumably an error string */ goto noident; } p += 6; while (SM_ISSPACE(*p)) p++; if (*p++ != ':') { /* either useridxx or malformed response */ goto noident; } /* p now points to the OSTYPE field */ while (SM_ISSPACE(*p)) p++; ostype = p; p = strchr(p, ':'); if (p == NULL) { /* malformed response */ goto noident; } else { char *charset; *p = '\0'; charset = strchr(ostype, ','); if (charset != NULL) *charset = '\0'; } /* 1413 says don't do this -- but it's broken otherwise */ while (isascii(*++p) && isspace(*p)) continue; /* p now points to the authenticated name -- copy carefully */ if (sm_strncasecmp(ostype, "other", 5) == 0 && (ostype[5] == ' ' || ostype[5] == '\0')) { (void) sm_strlcpy(hbuf, "IDENT:", sizeof(hbuf)); cleanstrcpy(&hbuf[6], p, MAXAUTHINFO); } else cleanstrcpy(hbuf, p, MAXAUTHINFO); len = strlen(hbuf); (void) sm_strlcpyn(&hbuf[len], sizeof(hbuf) - len, 2, "@", RealHostName == NULL ? "localhost" : RealHostName); goto postident; closeident: (void) close(s); sm_clrevent(ev); noident: /* put back the original incoming port */ switch (RealHostAddr.sa.sa_family) { #if NETINET case AF_INET: if (port > 0) RealHostAddr.sin.sin_port = port; break; #endif /* NETINET */ #if NETINET6 case AF_INET6: if (port > 0) RealHostAddr.sin6.sin6_port = port; break; #endif /* NETINET6 */ } if (RealHostName == NULL) { if (tTd(9, 1)) sm_dprintf("getauthinfo: NULL\n"); return NULL; } (void) sm_strlcpy(hbuf, RealHostName, sizeof(hbuf)); postident: #if IP_SRCROUTE # ifndef GET_IPOPT_DST # define GET_IPOPT_DST(dst) (dst) # endif /* ** Extract IP source routing information. ** ** Format of output for a connection from site a through b ** through c to d: ** loose: @site-c@site-b:site-a ** strict: !@site-c@site-b:site-a ** ** o - pointer within ipopt_list structure. ** q - pointer within ls/ss rr route data ** p - pointer to hbuf */ if (RealHostAddr.sa.sa_family == AF_INET) { SOCKOPT_LEN_T ipoptlen; int j; unsigned char *q; unsigned char *o; int l; struct IPOPTION ipopt; ipoptlen = sizeof(ipopt); if (getsockopt(fd, IPPROTO_IP, IP_OPTIONS, (char *) &ipopt, &ipoptlen) < 0) goto noipsr; if (ipoptlen == 0) goto noipsr; o = (unsigned char *) ipopt.IP_LIST; while (o != NULL && o < (unsigned char *) &ipopt + ipoptlen) { switch (*o) { case IPOPT_EOL: o = NULL; break; case IPOPT_NOP: o++; break; case IPOPT_SSRR: case IPOPT_LSRR: /* ** Source routing. ** o[0] is the option type (loose/strict). ** o[1] is the length of this option, ** including option type and ** length. ** o[2] is the pointer into the route ** data. ** o[3] begins the route data. */ p = &hbuf[strlen(hbuf)]; l = sizeof(hbuf) - (hbuf - p) - 6; (void) sm_snprintf(p, SPACELEFT(hbuf, p), " [%s@%.*s", *o == IPOPT_SSRR ? "!" : "", l > 240 ? 120 : l / 2, inet_ntoa(GET_IPOPT_DST(ipopt.IP_DST))); i = strlen(p); p += i; l -= strlen(p); j = o[1] / sizeof(struct in_addr) - 1; /* q skips length and router pointer to data */ q = &o[3]; for ( ; j >= 0; j--) { struct in_addr addr; memcpy(&addr, q, sizeof(addr)); (void) sm_snprintf(p, SPACELEFT(hbuf, p), "%c%.*s", j != 0 ? '@' : ':', l > 240 ? 120 : j == 0 ? l : l / 2, inet_ntoa(addr)); i = strlen(p); p += i; l -= i + 1; q += sizeof(struct in_addr); } o += o[1]; break; default: /* Skip over option */ o += o[1]; break; } } (void) sm_snprintf(p, SPACELEFT(hbuf, p), "]"); goto postipsr; } noipsr: #endif /* IP_SRCROUTE */ if (RealHostName != NULL && RealHostName[0] != '[') { p = &hbuf[strlen(hbuf)]; (void) sm_snprintf(p, SPACELEFT(hbuf, p), " [%.100s]", anynet_ntoa(&RealHostAddr)); } if (*may_be_forged) { p = &hbuf[strlen(hbuf)]; (void) sm_strlcpy(p, " (may be forged)", SPACELEFT(hbuf, p)); macdefine(&BlankEnvelope.e_macro, A_PERM, macid("{client_resolve}"), "FORGED"); } #if IP_SRCROUTE postipsr: #endif /* IP_SRCROUTE */ /* put back the original incoming port */ switch (RealHostAddr.sa.sa_family) { #if NETINET case AF_INET: if (port > 0) RealHostAddr.sin.sin_port = port; break; #endif /* NETINET */ #if NETINET6 case AF_INET6: if (port > 0) RealHostAddr.sin6.sin6_port = port; break; #endif /* NETINET6 */ } if (tTd(9, 1)) sm_dprintf("getauthinfo: %s\n", hbuf); return hbuf; } /* ** HOST_MAP_LOOKUP -- turn a hostname into canonical form ** ** Parameters: ** map -- a pointer to this map. ** name -- the (presumably unqualified) hostname. ** av -- unused -- for compatibility with other mapping ** functions. ** statp -- an exit status (out parameter) -- set to ** EX_TEMPFAIL if the name server is unavailable. ** ** Returns: ** The mapping, if found. ** NULL if no mapping found. ** ** Side Effects: ** Looks up the host specified in hbuf. If it is not ** the canonical name for that host, return the canonical ** name (unless MF_MATCHONLY is set, which will cause the ** status only to be returned). */ char * host_map_lookup(map, name, av, statp) MAP *map; char *name; char **av; int *statp; { register struct hostent *hp; #if NETINET struct in_addr in_addr; #endif #if NETINET6 struct in6_addr in6_addr; #endif char *cp, *ans = NULL; register STAB *s; time_t now; #if NAMED_BIND time_t SM_NONVOLATILE retrans = 0; int SM_NONVOLATILE retry = 0; #endif char hbuf[MAXNAME + 1]; /* ** See if we have already looked up this name. If so, just ** return it (unless expired). */ now = curtime(); s = stab(name, ST_NAMECANON, ST_ENTER); if (bitset(NCF_VALID, s->s_namecanon.nc_flags) && s->s_namecanon.nc_exp >= now) { if (tTd(9, 1)) sm_dprintf("host_map_lookup(%s) => CACHE %s\n", name, s->s_namecanon.nc_cname == NULL ? "NULL" : s->s_namecanon.nc_cname); errno = s->s_namecanon.nc_errno; SM_SET_H_ERRNO(s->s_namecanon.nc_herrno); *statp = s->s_namecanon.nc_stat; if (*statp == EX_TEMPFAIL) { CurEnv->e_status = "4.4.3"; message("851 %s: Name server timeout", shortenstring(name, 33)); } if (*statp != EX_OK) return NULL; if (s->s_namecanon.nc_cname == NULL) { syserr("host_map_lookup(%s): bogus NULL cache entry, errno=%d, h_errno=%d", name, s->s_namecanon.nc_errno, s->s_namecanon.nc_herrno); return NULL; } if (bitset(NCF_SECURE, s->s_namecanon.nc_flags)) map->map_mflags |= MF_SECURE; else map->map_mflags &= ~MF_SECURE; if (bitset(MF_MATCHONLY, map->map_mflags)) cp = map_rewrite(map, name, strlen(name), NULL); else cp = map_rewrite(map, s->s_namecanon.nc_cname, strlen(s->s_namecanon.nc_cname), av); return cp; } /* ** If we are running without a regular network connection (usually ** dial-on-demand) and we are just queueing, we want to avoid DNS ** lookups because those could try to connect to a server. */ if (CurEnv->e_sendmode == SM_DEFER && bitset(MF_DEFER, map->map_mflags)) { if (tTd(9, 1)) sm_dprintf("host_map_lookup(%s) => DEFERRED\n", name); *statp = EX_TEMPFAIL; return NULL; } /* ** If first character is a bracket, then it is an address ** lookup. Address is copied into a temporary buffer to ** strip the brackets and to preserve name if address is ** unknown. */ if (tTd(9, 1)) sm_dprintf("host_map_lookup(%s) => ", name); #if NAMED_BIND if (map->map_timeout > 0) { retrans = _res.retrans; _res.retrans = map->map_timeout; } if (map->map_retry > 0) { retry = _res.retry; _res.retry = map->map_retry; } #endif /* NAMED_BIND */ /* set default TTL */ s->s_namecanon.nc_exp = now + SM_DEFAULT_TTL; if (*name != '[') { int ttl, r; (void) sm_strlcpy(hbuf, name, sizeof(hbuf)); r = getcanonname(hbuf, sizeof(hbuf) - 1, !HasWildcardMX, &ttl); if (r != HOST_NOTFOUND) { ans = hbuf; if (ttl > 0) s->s_namecanon.nc_exp = now + SM_MIN(ttl, SM_DEFAULT_TTL); if (HOST_SECURE == r) { s->s_namecanon.nc_flags |= NCF_SECURE; map->map_mflags |= MF_SECURE; } else { s->s_namecanon.nc_flags &= ~NCF_SECURE; map->map_mflags &= ~MF_SECURE; } } } else { if ((cp = strchr(name, ']')) == NULL) { if (tTd(9, 1)) sm_dprintf("FAILED\n"); return NULL; } *cp = '\0'; hp = NULL; /* should this be considered secure? */ map->map_mflags &= ~MF_SECURE; #if NETINET if ((in_addr.s_addr = inet_addr(&name[1])) != INADDR_NONE) hp = sm_gethostbyaddr((char *)&in_addr, INADDRSZ, AF_INET); #endif /* NETINET */ #if NETINET6 if (hp == NULL && anynet_pton(AF_INET6, &name[1], &in6_addr) == 1) hp = sm_gethostbyaddr((char *)&in6_addr, IN6ADDRSZ, AF_INET6); #endif /* NETINET6 */ *cp = ']'; if (hp != NULL) { /* found a match -- copy out */ ans = denlstring((char *) hp->h_name, true, true); #if NETINET6 if (ans == hp->h_name) { static char n[MAXNAME + 1]; /* hp->h_name is about to disappear */ (void) sm_strlcpy(n, ans, sizeof(n)); ans = n; } FREEHOSTENT(hp, NULL); #endif /* NETINET6 */ } } #if NAMED_BIND if (map->map_timeout > 0) _res.retrans = retrans; if (map->map_retry > 0) _res.retry = retry; #endif /* NAMED_BIND */ s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ /* Found an answer */ if (ans != NULL) { s->s_namecanon.nc_stat = *statp = EX_OK; if (s->s_namecanon.nc_cname != NULL) sm_free(s->s_namecanon.nc_cname); s->s_namecanon.nc_cname = sm_strdup_x(ans); if (bitset(MF_MATCHONLY, map->map_mflags)) cp = map_rewrite(map, name, strlen(name), NULL); else cp = map_rewrite(map, ans, strlen(ans), av); if (tTd(9, 1)) sm_dprintf("FOUND %s\n", ans); return cp; } /* No match found */ s->s_namecanon.nc_errno = errno; #if NAMED_BIND s->s_namecanon.nc_herrno = h_errno; if (tTd(9, 1)) sm_dprintf("FAIL (%d)\n", h_errno); switch (h_errno) { case TRY_AGAIN: if (UseNameServer) { CurEnv->e_status = "4.4.3"; message("851 %s: Name server timeout", shortenstring(name, 33)); } *statp = EX_TEMPFAIL; break; case HOST_NOT_FOUND: case NO_DATA: *statp = EX_NOHOST; break; case NO_RECOVERY: *statp = EX_SOFTWARE; break; default: *statp = EX_UNAVAILABLE; break; } #else /* NAMED_BIND */ if (tTd(9, 1)) sm_dprintf("FAIL\n"); *statp = EX_NOHOST; #endif /* NAMED_BIND */ s->s_namecanon.nc_stat = *statp; return NULL; } /* ** HOST_MAP_INIT -- initialize host class structures ** ** Parameters: ** map -- a pointer to this map. ** args -- argument string. ** ** Returns: ** true. */ bool host_map_init(map, args) MAP *map; char *args; { register char *p = args; for (;;) { while (SM_ISSPACE(*p)) p++; if (*p != '-') break; switch (*++p) { case 'a': map->map_app = ++p; break; case 'T': map->map_tapp = ++p; break; case 'm': map->map_mflags |= MF_MATCHONLY; break; case 't': map->map_mflags |= MF_NODEFER; break; case 'S': /* only for consistency */ map->map_spacesub = *++p; break; case 'D': map->map_mflags |= MF_DEFER; break; case 'd': { char *h; while (isascii(*++p) && isspace(*p)) continue; h = strchr(p, ' '); if (h != NULL) *h = '\0'; map->map_timeout = convtime(p, 's'); if (h != NULL) *h = ' '; } break; case 'r': while (isascii(*++p) && isspace(*p)) continue; map->map_retry = atoi(p); break; } while (*p != '\0' && !(SM_ISSPACE(*p))) p++; if (*p != '\0') *p++ = '\0'; } if (map->map_app != NULL) map->map_app = newstr(map->map_app); if (map->map_tapp != NULL) map->map_tapp = newstr(map->map_tapp); return true; } #if NETINET6 /* ** ANYNET_NTOP -- convert an IPv6 network address to printable form. ** ** Parameters: ** s6a -- a pointer to an in6_addr structure. ** dst -- buffer to store result in ** dst_len -- size of dst buffer ** ** Returns: ** A printable version of that structure. */ char * anynet_ntop(s6a, dst, dst_len) struct in6_addr *s6a; char *dst; size_t dst_len; { register char *ap; if (IN6_IS_ADDR_V4MAPPED(s6a)) ap = (char *) inet_ntop(AF_INET, &s6a->s6_addr[IN6ADDRSZ - INADDRSZ], dst, dst_len); else { char *d; size_t sz; /* Save pointer to beginning of string */ d = dst; /* Add IPv6: protocol tag */ sz = sm_strlcpy(dst, "IPv6:", dst_len); if (sz >= dst_len) return NULL; dst += sz; dst_len -= sz; if (UseCompressedIPv6Addresses) ap = (char *) inet_ntop(AF_INET6, s6a, dst, dst_len); else ap = sm_inet6_ntop(s6a, dst, dst_len); /* Restore pointer to beginning of string */ if (ap != NULL) ap = d; } return ap; } /* ** ANYNET_PTON -- convert printed form to network address. ** ** Wrapper for inet_pton() which handles IPv6: labels. ** ** Parameters: ** family -- address family ** src -- string ** dst -- destination address structure ** ** Returns: ** 1 if the address was valid ** 0 if the address wasn't parsable ** -1 if error */ int anynet_pton(family, src, dst) int family; const char *src; void *dst; { if (family == AF_INET6 && sm_strncasecmp(src, "IPv6:", 5) == 0) src += 5; return inet_pton(family, src, dst); } #endif /* NETINET6 */ /* ** ANYNET_NTOA -- convert a network address to printable form. ** ** Parameters: ** sap -- a pointer to a sockaddr structure. ** ** Returns: ** A printable version of that sockaddr. */ #ifdef USE_SOCK_STREAM # if NETLINK # include # endif char * anynet_ntoa(sap) register SOCKADDR *sap; { register char *bp; register char *ap; int l; static char buf[100]; /* check for null/zero family */ if (sap == NULL) return "NULLADDR"; if (sap->sa.sa_family == 0) return "0"; switch (sap->sa.sa_family) { # if NETUNIX case AF_UNIX: if (sap->sunix.sun_path[0] != '\0') (void) sm_snprintf(buf, sizeof(buf), "[UNIX: %.64s]", sap->sunix.sun_path); else (void) sm_strlcpy(buf, "[UNIX: localhost]", sizeof(buf)); return buf; # endif /* NETUNIX */ # if NETINET case AF_INET: return (char *) inet_ntoa(sap->sin.sin_addr); # endif # if NETINET6 case AF_INET6: ap = anynet_ntop(&sap->sin6.sin6_addr, buf, sizeof(buf)); if (ap != NULL) return ap; break; # endif /* NETINET6 */ # if NETLINK case AF_LINK: (void) sm_snprintf(buf, sizeof(buf), "[LINK: %s]", link_ntoa((struct sockaddr_dl *) &sap->sa)); return buf; # endif /* NETLINK */ default: /* this case is needed when nothing is #defined */ /* in order to keep the switch syntactically correct */ break; } /* unknown family -- just dump bytes */ (void) sm_snprintf(buf, sizeof(buf), "Family %d: ", sap->sa.sa_family); bp = &buf[strlen(buf)]; ap = sap->sa.sa_data; for (l = sizeof(sap->sa.sa_data); --l >= 0; ) { (void) sm_snprintf(bp, SPACELEFT(buf, bp), "%02x:", *ap++ & 0377); bp += 3; } *--bp = '\0'; return buf; } /* ** HOSTNAMEBYANYADDR -- return name of host based on address ** ** Parameters: ** sap -- SOCKADDR pointer ** ** Returns: ** text representation of host name. ** ** Side Effects: ** none. */ char * hostnamebyanyaddr(sap) register SOCKADDR *sap; { register struct hostent *hp; # if NAMED_BIND int saveretry; # endif # if NETINET6 struct in6_addr in6_addr; # endif /* NETINET6 */ # if NAMED_BIND /* shorten name server timeout to avoid higher level timeouts */ saveretry = _res.retry; if (_res.retry * _res.retrans > 20) _res.retry = 20 / _res.retrans; if (_res.retry == 0) _res.retry = 1; # endif /* NAMED_BIND */ switch (sap->sa.sa_family) { # if NETINET case AF_INET: hp = sm_gethostbyaddr((char *) &sap->sin.sin_addr, INADDRSZ, AF_INET); break; # endif /* NETINET */ # if NETINET6 case AF_INET6: hp = sm_gethostbyaddr((char *) &sap->sin6.sin6_addr, IN6ADDRSZ, AF_INET6); break; # endif /* NETINET6 */ # if NETISO case AF_ISO: hp = sm_gethostbyaddr((char *) &sap->siso.siso_addr, sizeof(sap->siso.siso_addr), AF_ISO); break; # endif /* NETISO */ # if NETUNIX case AF_UNIX: hp = NULL; break; # endif /* NETUNIX */ default: hp = sm_gethostbyaddr(sap->sa.sa_data, sizeof(sap->sa.sa_data), sap->sa.sa_family); break; } # if NAMED_BIND _res.retry = saveretry; # endif # if NETINET || NETINET6 if (hp != NULL && hp->h_name[0] != '[' # if NETINET6 && inet_pton(AF_INET6, hp->h_name, &in6_addr) != 1 # endif /* NETINET6 */ # if NETINET && inet_addr(hp->h_name) == INADDR_NONE # endif ) { char *name; name = denlstring((char *) hp->h_name, true, true); # if NETINET6 if (name == hp->h_name) { static char n[MAXNAME + 1]; /* Copy the string, hp->h_name is about to disappear */ (void) sm_strlcpy(n, name, sizeof(n)); name = n; } FREEHOSTENT(hp, NULL); # endif /* NETINET6 */ return name; } # endif /* NETINET || NETINET6 */ FREEHOSTENT(hp, NULL); # if NETUNIX if (sap->sa.sa_family == AF_UNIX && sap->sunix.sun_path[0] == '\0') return "localhost"; # endif { static char buf[203]; (void) sm_snprintf(buf, sizeof(buf), "[%.200s]", anynet_ntoa(sap)); return buf; } } #endif /* USE_SOCK_STREAM */