Deal with the possibility that we might be running as a subprocess.

[~andy/fetchmail] / fetchmail.c

/*
 * fetchmail.c -- main driver module for fetchmail
 *
 * For license terms, see the file COPYING in this directory.
 */
#include "config.h"

#include <stdio.h>
#include <ctype.h>
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#include <getopt.h>
#if defined(HAVE_SYSLOG)
#include <syslog.h>
#endif
#include <pwd.h>
#ifdef __FreeBSD__
#include <grp.h>
#endif
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SETRLIMIT
#include <sys/resource.h>
#endif /* HAVE_SETRLIMIT */
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif /* HAVE_SYS_WAIT_H */
#include <sys/utsname.h>

#ifdef HAVE_GETHOSTBYNAME
#include <netdb.h>
#endif /* HAVE_GETHOSTBYNAME */

#ifdef HESIOD
#include <hesiod.h>
#endif

#include "fetchmail.h"
#include "tunable.h"
#include "smtp.h"
#include "netrc.h"
#include "i18n.h"

#ifndef ENETUNREACH
#define ENETUNREACH   128       /* Interactive doesn't know this */
#endif /* ENETUNREACH */

/* prototypes for internal functions */
static int load_params(int, char **, int);
static void dump_params (struct runctl *runp, struct query *, flag implicit);
static int query_host(struct query *);

/* controls the detail level of status/progress messages written to stderr */
int outlevel;               /* see the O_.* constants above */

/* miscellaneous global controls */
struct runctl run;          /* global controls for this run */
flag nodetach;              /* if TRUE, don't detach daemon process */
flag quitmode;              /* if --quit was set */
flag check_only;            /* if --probe was set */
flag versioninfo;           /* emit only version info */
char *user;                 /* the name of the invoking user */
char *home;                 /* invoking user's home directory */
char *program_name;         /* the name to prefix error messages with */
flag configdump;            /* dump control blocks for configurator */
const char *fetchmailhost;  /* either `localhost' or the host's FQDN */
volatile int lastsig;           /* last signal received */

#if NET_SECURITY
void *request = NULL;
int requestlen = 0;
#endif /* NET_SECURITY */

static char *lockfile;          /* name of lockfile */
static int lock_acquired;       /* have we acquired a lock */
static int querystatus;         /* status of query */
static int successes;           /* count number of successful polls */
static struct runctl cmd_run;   /* global options set from command line */
static time_t parsetime;        /* time of last parse */

static void terminate_run(int);
static void terminate_poll(int);

#ifdef SLEEP_WITH_ALARM
/*
 * The function of this variable is to remove the window during which a
 * SIGALRM can hose the code (ALARM is triggered *before* pause() is called).
 * This is a bit of a kluge; the real right thing would use sigprocmask(),
 * sigsuspend().  This workaround lets the interval timer trigger the first
 * alarm after the required interval and will then generate alarms all 5
 * seconds, until it is certain, that the critical section (ie., the window)
 * is left.
 */
#if defined(STDC_HEADERS)
static sig_atomic_t     alarm_latch = FALSE;
#else
/* assume int can be written in one atomic operation on non ANSI-C systems */
static int              alarm_latch = FALSE;
#endif

RETSIGTYPE gotsigalrm(sig)
int sig;
{
    signal(sig, gotsigalrm);
    lastsig = sig;
    alarm_latch = TRUE;
}
#endif /* SLEEP_WITH_ALARM */

RETSIGTYPE donothing(int sig) {signal(sig, donothing); lastsig = sig;}

#ifdef HAVE_ON_EXIT
static void unlockit(int n, void *p)
#else
static void unlockit(void)
#endif
/* must-do actions for exit (but we can't count on being able to do malloc) */
{
    if (lockfile && lock_acquired)
        unlink(lockfile);
}

#ifdef __EMX__
/* Various EMX-specific definitions */
int itimerflag;
void itimerthread(void* dummy) {
  if (outlevel >= O_VERBOSE)
    report(stderr, _("fetchmail: thread sleeping for %d sec.\n"), poll_interval);
  while(1) {
    _sleep2(poll_interval*1000);
    kill((getpid()), SIGALRM);
  }
}
#endif

#ifdef __FreeBSD__
/* drop SGID kmem privileage until we need it */
static void dropprivs(void)
{
    struct group *gr;
    gid_t        egid;
    gid_t        rgid;
    
    egid = getegid();
    rgid = getgid();
    gr = getgrgid(egid);
    
    if (gr && !strcmp(gr->gr_name, "kmem"))
    {
        extern void interface_set_gids(gid_t egid, gid_t rgid);
        interface_set_gids(egid, rgid);
        setegid(rgid);
    }
}
#endif

int main(int argc, char **argv)
{
    int st, bkgd = FALSE;
    int parsestatus, implicitmode = FALSE;
    FILE        *lockfp;
    struct query *ctl;
    netrc_entry *netrc_list;
    char *netrc_file, *tmpbuf;
    pid_t pid;

#ifdef __FreeBSD__
    dropprivs();
#endif

    envquery(argc, argv);
#ifdef ENABLE_NLS
    bindtextdomain(PACKAGE, LOCALEDIR);
    textdomain(PACKAGE);
#endif

    /*
     * Note: because we can't initialize reporting before we  know whether
     * syslog is supposed to be on, this message will go to stdout and
     * be lost when running in background.
     */
    if (outlevel >= O_VERBOSE)
    {
        int i;

        report(stdout, "fetchmail: invoked with");
        for (i = 0; i < argc; i++)
            report(stdout, " %s", argv[i]);
        report(stdout, "\n");
    }

#define IDFILE_NAME     ".fetchids"
    run.idfile = (char *) xmalloc(strlen(home)+sizeof(IDFILE_NAME)+1);
    strcpy(run.idfile, home);
    strcat(run.idfile, "/");
    strcat(run.idfile, IDFILE_NAME);
  
    outlevel = O_NORMAL;

    /*
     * We used to arrange for the lockfile to be removed on exit close
     * to where the lock was asserted.  Now we need to do it here, because
     * we might have re-executed in background with an existing lockfile
     * as the result of a changed rcfile (see the code near the execvp(3)
     * call near the beginning of the polling loop for details).  We want
     * to be sure the lockfile gets nuked on any error exit, basically.
     */
#ifdef HAVE_ATEXIT
    atexit(unlockit);
#endif
#ifdef HAVE_ON_EXIT
    on_exit(unlockit, (char *)NULL);
#endif

    if ((parsestatus = parsecmdline(argc,argv, &cmd_run, &cmd_opts)) < 0)
        exit(PS_SYNTAX);

    if (versioninfo)
    {
        printf(_("This is fetchmail release %s"), VERSION);
#ifdef POP2_ENABLE
        printf("+POP2");
#endif /* POP2_ENABLE */
#ifndef POP3_ENABLE
        printf("-POP3");
#endif /* POP3_ENABLE */
#ifndef IMAP_ENABLE
        printf("-IMAP");
#endif /* IMAP_ENABLE */
#ifdef GSSAPI
        printf("+IMAP-GSS");
#endif /* GSSAPI */
#ifdef RPA_ENABLE
        printf("+RPA");
#endif /* RPA_ENABLE */
#ifdef NTLM_ENABLE
        printf("+NTLM");
#endif /* NTLM_ENABLE */
#ifdef SDPS_ENABLE
        printf("+SDPS");
#endif /* SDPS_ENABLE */
#ifndef ETRN_ENABLE
        printf("-ETRN");
#endif /* ETRN_ENABLE */
#ifdef SSL_ENABLE
        printf("+SSL");
#endif
#if OPIE_ENABLE
        printf("+OPIE");
#endif /* OPIE_ENABLE */
#if INET6_ENABLE
        printf("+INET6");
#endif /* INET6_ENABLE */
#if NET_SECURITY
        printf("+NETSEC");
#endif /* NET_SECURITY */
#ifdef HAVE_SOCKS
        printf("+SOCKS");
#endif /* HAVE_SOCKS */
#if ENABLE_NLS
        printf("+NLS");
#endif /* ENABLE_NLS */
        putchar('\n');
        fflush(stdout);

        /* this is an attempt to help remote debugging */
        system("uname -a");
    }

    /* avoid parsing the config file if all we're doing is killing a daemon */ 
    if (!(quitmode && argc == 2))
        implicitmode = load_params(argc, argv, optind);

#if defined(HAVE_SYSLOG)
    /* logging should be set up early in case we were restarted from exec */
    if (run.use_syslog)
    {
        openlog(program_name, LOG_PID, LOG_MAIL);
        report_init(-1);
    }
    else
#endif
        report_init((run.poll_interval == 0 || nodetach) && !run.logfile);

    /* set up to do lock protocol */
#define FETCHMAIL_PIDFILE       "fetchmail.pid"
    if (!getuid()) {
        xalloca(tmpbuf, char *,
                sizeof(PID_DIR) + sizeof(FETCHMAIL_PIDFILE));
        sprintf(tmpbuf, "%s/%s", PID_DIR, FETCHMAIL_PIDFILE);
    } else {
        xalloca(tmpbuf, char *, strlen(home) + sizeof(FETCHMAIL_PIDFILE) + 2);
        strcpy(tmpbuf, home);
        strcat(tmpbuf, "/.");
        strcat(tmpbuf, FETCHMAIL_PIDFILE);
    }
#undef FETCHMAIL_PIDFILE

#ifdef HAVE_SETRLIMIT
    /*
     * Before getting passwords, disable core dumps unless -v -d0 mode is on.
     * Core dumps could otherwise contain passwords to be scavenged by a
     * cracker.
     */
    if (outlevel < O_VERBOSE || run.poll_interval > 0)
    {
        struct rlimit corelimit;
        corelimit.rlim_cur = 0;
        corelimit.rlim_max = 0;
        setrlimit(RLIMIT_CORE, &corelimit);
    }
#endif /* HAVE_SETRLIMIT */

#define NETRC_FILE      ".netrc"
    /* parse the ~/.netrc file (if present) for future password lookups. */
    xalloca(netrc_file, char *, strlen (home) + sizeof(NETRC_FILE) + 1);
    strcpy (netrc_file, home);
    strcat (netrc_file, "/");
    strcat (netrc_file, NETRC_FILE);
    netrc_list = parse_netrc(netrc_file);
#undef NETRC_FILE

    /* pick up passwords where we can */ 
    for (ctl = querylist; ctl; ctl = ctl->next)
    {
        if (ctl->active && !(implicitmode && ctl->server.skip)&&!ctl->password)
        {
            if (ctl->server.preauthenticate == A_KERBEROS_V4 ||
                        ctl->server.preauthenticate == A_KERBEROS_V5 ||
                        ctl->server.preauthenticate == A_SSH ||
#ifdef GSSAPI
                        ctl->server.protocol == P_IMAP_GSS ||
#endif /* GSSAPI */
                        ctl->server.protocol == P_IMAP_K4)
                /* Server won't care what the password is, but there
                   must be some non-null string here.  */
                ctl->password = ctl->remotename;
            else
            {
                netrc_entry *p;

                /* look up the pollname and account in the .netrc file. */
                p = search_netrc(netrc_list,
                                 ctl->server.pollname, ctl->remotename);
                /* if we find a matching entry with a password, use it */
                if (p && p->password)
                    ctl->password = xstrdup(p->password);

                /* otherwise try with "via" name if there is one */
                else if (ctl->server.via)
                {
                    p = search_netrc(netrc_list, 
                                     ctl->server.via, ctl->remotename);
                    if (p && p->password)
                        ctl->password = xstrdup(p->password);
                }
            }
        }
    }

    /* perhaps we just want to check options? */
    if (versioninfo)
    {
        int havercfile = access(rcfile, 0);

        printf(_("Taking options from command line%s%s\n"),
                                havercfile ? "" :  _(" and "),
                                havercfile ? "" : rcfile);

        if (outlevel >= O_VERBOSE)
            printf(_("Lockfile at %s\n"), tmpbuf);

        if (querylist == NULL)
            fprintf(stderr,
                    _("No mailservers set up -- perhaps %s is missing?\n"),
                    rcfile);
        else
            dump_params(&run, querylist, implicitmode);
        exit(0);
    }

    /* dump options as a Python dictionary, for configurator use */
    if (configdump)
    {
        dump_config(&run, querylist);
        exit(0);
    }

    /* check for another fetchmail running concurrently */
    pid = -1;
    if ((lockfile = (char *) malloc(strlen(tmpbuf) + 1)) == NULL)
    {
        report(stderr,_("fetchmail: cannot allocate memory for lock name.\n"));
        exit(PS_EXCLUDE);
    }
    else
        (void) strcpy(lockfile, tmpbuf);
    if ((lockfp = fopen(lockfile, "r")) != NULL )
    {
        bkgd = (fscanf(lockfp,"%d %d", &pid, &st) == 2);

        if (kill(pid, 0) == -1) {
            fprintf(stderr,_("fetchmail: removing stale lockfile\n"));
            pid = -1;
            bkgd = FALSE;
            unlink(lockfile);
        }
        fclose(lockfp); /* not checking should be safe, file mode was "r" */
    }

    /* if no mail servers listed and nothing in background, we're done */
    if (!(quitmode && argc == 2) && pid == -1 && querylist == NULL) {
        (void)fputs(_("fetchmail: no mailservers have been specified.\n"),stderr);
        exit(PS_SYNTAX);
    }

    /* perhaps user asked us to kill the other fetchmail */
    if (quitmode)
    {
        if (pid == -1) 
        {
            fprintf(stderr,_("fetchmail: no other fetchmail is running\n"));
            if (argc == 2)
                exit(PS_EXCLUDE);
        }
        else if (kill(pid, SIGTERM) < 0)
        {
            fprintf(stderr,_("fetchmail: error killing %s fetchmail at %d; bailing out.\n"),
                    bkgd ? _("background") : _("foreground"), pid);
            exit(PS_EXCLUDE);
        }
        else
        {
            fprintf(stderr,_("fetchmail: %s fetchmail at %d killed.\n"),
                    bkgd ? _("background") : _("foreground"), pid);
            unlink(lockfile);
            if (argc == 2)
                exit(0);
            else
                pid = -1; 
        }
    }

    /* another fetchmail is running -- wake it up or die */
    if (pid != -1)
    {
        if (check_only)
        {
            fprintf(stderr,
                 _("fetchmail: can't check mail while another fetchmail to same host is running.\n"));
            return(PS_EXCLUDE);
        }
        else if (!implicitmode)
        {
            fprintf(stderr,
                 _("fetchmail: can't poll specified hosts with another fetchmail running at %d.\n"),
                 pid);
                return(PS_EXCLUDE);
        }
        else if (!bkgd)
        {
            fprintf(stderr,
                 _("fetchmail: another foreground fetchmail is running at %d.\n"),
                 pid);
                return(PS_EXCLUDE);
        }
        else if (argc > 1)
        {
            /* this test enables re-execing on a changed rcfile */
            if (getpid() == pid)
                lock_acquired = TRUE;
            else
            {
                fprintf(stderr,
                        _("fetchmail: can't accept options while a background fetchmail is running.\n"));
                return(PS_EXCLUDE);
            }
        }
        else if (kill(pid, SIGUSR1) == 0)
        {
            fprintf(stderr,
                    _("fetchmail: background fetchmail at %d awakened.\n"),
                    pid);
            return(0);
        }
        else
        {
            /*
             * Should never happen -- possible only if a background fetchmail
             * croaks after the first kill probe above but before the
             * SIGUSR1/SIGHUP transmission.
             */
            fprintf(stderr,
                    _("fetchmail: elder sibling at %d died mysteriously.\n"),
                    pid);
            return(PS_UNDEFINED);
        }
    }

    /* pick up interactively any passwords we need but don't have */ 
    for (ctl = querylist; ctl; ctl = ctl->next)
    {
        if (ctl->active && !(implicitmode && ctl->server.skip)
                && ctl->server.protocol != P_ETRN 
                && ctl->server.protocol != P_IMAP_K4
#ifdef GSSAPI
                && ctl->server.protocol != P_IMAP_GSS
#endif /* GSSAPI */
                && !ctl->password)
            if (!isatty(0))
            {
                fprintf(stderr,
                        _("fetchmail: can't find a password for %s@s.\n"),
                        ctl->remotename, ctl->server.pollname);
                return(PS_AUTHFAIL);
            }
            else
            {
                char* password_prompt = _("Enter password for %s@%s: ");

                xalloca(tmpbuf, char *, strlen(password_prompt) +
                        strlen(ctl->remotename) +
                        strlen(ctl->server.pollname) + 1);
                (void) sprintf(tmpbuf, password_prompt,
                               ctl->remotename, ctl->server.pollname);
                ctl->password = xstrdup((char *)getpassword(tmpbuf));
            }
    }

    /*
     * Time to initiate the SOCKS library (this is not mandatory: it just
     * registers the correct application name for logging purpose. If you
     * have some problem, comment out these lines).
     */
#ifdef HAVE_SOCKS
    SOCKSinit("fetchmail");
#endif /* HAVE_SOCKS */

    /*
     * Maybe time to go to demon mode...
     */
    if (run.poll_interval)
    {
        if (!nodetach)
            daemonize(run.logfile, terminate_run);
        report(stdout, _("starting fetchmail %s daemon \n"), VERSION);

        /*
         * We'll set up a handler for these when we're sleeping,
         * but ignore them otherwise so as not to interrupt a poll.
         */
        signal(SIGUSR1, SIG_IGN);
        if (run.poll_interval && !getuid())
            signal(SIGHUP, SIG_IGN);
    }
    else if (run.logfile && access(run.logfile, F_OK) == 0)
    {
        freopen(run.logfile, "a", stdout);
        freopen(run.logfile, "a", stderr);
    }


#ifdef linux
    interface_init();
#endif /* linux */

    /* beyond here we don't want more than one fetchmail running per user */
    umask(0077);
    signal(SIGABRT, terminate_run);
    signal(SIGINT, terminate_run);
    signal(SIGTERM, terminate_run);
    signal(SIGALRM, terminate_run);
    signal(SIGPIPE, terminate_run);
    signal(SIGQUIT, terminate_run);

    /* here's the exclusion lock */
#ifndef O_SYNC
#define O_SYNC  0       /* use it if we have it */
#endif
    if ((st = open(lockfile, O_WRONLY|O_CREAT|O_EXCL|O_SYNC, 0666)) != -1)
    {
        sprintf(tmpbuf,"%d", getpid());
        write(st, tmpbuf, strlen(tmpbuf));
        if (run.poll_interval)
        {
            sprintf(tmpbuf," %d", run.poll_interval);
            write(st, tmpbuf, strlen(tmpbuf));
        }
        close(st);      /* should be safe, fd was opened with O_SYNC */
        lock_acquired = TRUE;
    }

    /*
     * Query all hosts. If there's only one, the error return will
     * reflect the status of that transaction.
     */
    do {
        /* 
         * Check to see if the rcfile has been touched.  If so,
         * re-exec so the file will be reread.  Doing it this way
         * avoids all the complications of trying to deallocate the
         * in-core control structures -- and the potential memory
         * leaks...
         */
        struct stat     rcstat;

        if (stat(rcfile, &rcstat) == -1)
        {
            if (errno != ENOENT)
                report(stderr, 
                       _("couldn't time-check %s (error %d)\n"),
                       rcfile, errno);
        }
        else if (rcstat.st_mtime > parsetime)
        {
            report(stdout, _("restarting fetchmail (%s changed)\n"), rcfile);
            execvp("fetchmail", argv);
            report(stderr, _("attempt to re-exec fetchmail failed\n"));
        }

#if defined(HAVE_RES_SEARCH) && defined(USE_TCPIP_FOR_DNS)
        /*
         * This was an efficiency hack that backfired.  The theory
         * was that using TCP/IP for DNS queries would get us better
         * reliability and shave off some per-UDP-packet costs.
         * Unfortunately it interacted badly with diald, which effectively 
         * filters out DNS queries over TCP/IP for reasons having to do
         * with some obscure kernel problem involving bootstrapping of
         * dynamically-addressed links.  I don't understand this mess
         * and don't want to, so it's "See ya!" to this hack.
         */
        sethostent(TRUE);       /* use TCP/IP for mailserver queries */
#endif /* HAVE_RES_SEARCH */

        batchcount = 0;
        for (ctl = querylist; ctl; ctl = ctl->next)
        {
            if (ctl->active && !(implicitmode && ctl->server.skip))
            {
                if (ctl->wedged)
                {
                    report(stderr, 
                          _("poll of %s skipped (failed authentication or too many timeouts)\n"),
                          ctl->server.pollname);
                    continue;
                }

                /* check skip interval first so that it counts all polls */
                if (run.poll_interval && ctl->server.interval) 
                {
                    if (ctl->server.poll_count++ % ctl->server.interval) 
                    {
                        if (outlevel >= O_VERBOSE)
                            report(stdout,
                                    _("interval not reached, not querying %s\n"),
                                    ctl->server.pollname);
                        continue;
                    }
                }

#if (defined(linux) && !INET6_ENABLE) || defined(__FreeBSD__)
                /* interface_approve() does its own error logging */
                if (!interface_approve(&ctl->server))
                    continue;
#endif /* (defined(linux) && !INET6_ENABLE) || defined(__FreeBSD__) */

                querystatus = query_host(ctl);

#ifdef POP3_ENABLE
                if (!check_only)
                    uid_end_query(ctl);
#endif  /* POP3_ENABLE */

                if (querystatus == PS_SUCCESS)
                    successes++;
                else if (!check_only && 
                         ((querystatus!=PS_NOMAIL) || (outlevel==O_DEBUG)))
                switch(querystatus)
                {
                case PS_SUCCESS:
                    report(stdout, "Query status=SUCCESS\n"); break ;
                case PS_NOMAIL: 
                    report(stdout, "Query status=NOMAIL\n"); break ;
                case PS_SOCKET:
                    report(stdout, "Query status=SOCKET\n"); break ;
                case PS_AUTHFAIL:
                    report(stdout, "Query status=AUTHFAIL\n"); break ;
                case PS_PROTOCOL:
                    report(stdout, "Query status=PROTOCOL\n"); break ;
                case PS_SYNTAX:
                    report(stdout, "Query status=SYNTAX\n"); break ;
                case PS_IOERR:
                    report(stdout, "Query status=IOERR\n"); break ;
                case PS_ERROR:
                    report(stdout, "Query status=ERROR\n"); break ;
                case PS_EXCLUDE:
                    report(stdout, "Query status=EXCLUDE\n"); break ;
                case PS_LOCKBUSY:
                    report(stdout, "Query status=LOCKBUSY\n"); break ;
                case PS_SMTP:
                    report(stdout, "Query status=SMTP\n"); break ;
                case PS_DNS:
                    report(stdout, "Query status=DNS\n"); break ;
                case PS_BSMTP:
                    report(stdout, "Query status=BSMTP\n"); break ;
                case PS_MAXFETCH:
                    report(stdout, "Query status=MAXFETCH\n"); break ;
                case PS_UNDEFINED:
                    report(stdout, "Query status=UNDEFINED\n"); break ;
                case PS_TRANSIENT:
                    report(stdout, "Query status=TRANSIENT\n"); break ;
                case PS_REFUSED:
                    report(stdout, "Query status=REFUSED\n"); break ;
                case PS_RETAINED:
                    report(stdout, "Query status=RETAINED\n"); break ;
                case PS_TRUNCATED:
                    report(stdout, "Query status=TRUNCATED\n"); break ;
                default:
                    report(stdout, _("Query status=%d\n"), querystatus); break;
                }

#if (defined(linux) && !INET6_ENABLE) || defined (__FreeBSD__)
                if (ctl->server.monitor)
                {
                    /*
                     * Allow some time for the link to quiesce.  One
                     * second is usually sufficient, three is safe.
                     * Note:  this delay is important - don't remove!
                     */
                    sleep(3);
                    interface_note_activity(&ctl->server);
                }
#endif /* (defined(linux) && !INET6_ENABLE) || defined(__FreeBSD__) */
            }
        }

#if defined(HAVE_RES_SEARCH) && defined(USE_TCPIP_FOR_DNS)
        endhostent();           /* release TCP/IP connection to nameserver */
#endif /* HAVE_RES_SEARCH */

        /* close connections cleanly */
        terminate_poll(0);

        /*
         * OK, we've polled.  Now sleep.
         */
        if (run.poll_interval)
        {
            /* 
             * Because passwords can expire, it may happen that *all*
             * hosts are now out of the loop due to authfail
             * conditions.  If this happens daemon-mode fetchmail
             * should softly and silently vanish away, rather than
             * spinning uselessly.
             */
            int unwedged = 0;

            for (ctl = querylist; ctl; ctl = ctl->next)
                if (ctl->active && !(implicitmode && ctl->server.skip))
                    if (!ctl->wedged)
                        unwedged++;
            if (!unwedged)
            {
                report(stderr, _("All connections are wedged.  Exiting.\n"));
                /* FIXME: someday, send notification mail */
                exit(PS_AUTHFAIL);
            }

            if (outlevel >= O_VERBOSE)
                report(stdout, 
                       _("fetchmail: sleeping at %s\n"), rfc822timestamp());

            /*
             * With this simple hack, we make it possible for a foreground 
             * fetchmail to wake up one in daemon mode.  What we want is the
             * side effect of interrupting any sleep that may be going on,
             * forcing fetchmail to re-poll its hosts.  The second line is
             * for people who think all system daemons wake up on SIGHUP.
             */
            signal(SIGUSR1, donothing);
            if (!getuid())
                signal(SIGHUP, donothing);

            /* time for a pause in the action... */
            {
#ifndef __EMX__
#ifdef SLEEP_WITH_ALARM         /* not normally on */
                /*
                 * We can't use sleep(3) here because we need an alarm(3)
                 * equivalent in order to implement server nonresponse timeout.
                 * We'll just assume setitimer(2) is available since fetchmail
                 * has to have a BSDoid socket layer to work at all.
                 */
                /* 
                 * This code stopped working under glibc-2, apparently due
                 * to the change in signal(2) semantics.  (The siginterrupt
                 * line, added later, should fix this problem.) John Stracke
                 * <francis@netscape.com> wrote:
                 *
                 * The problem seems to be that, after hitting the interval
                 * timer while talking to the server, the process no longer
                 * responds to SIGALRM.  I put in printf()s to see when it
                 * reached the pause() for the poll interval, and I checked
                 * the return from setitimer(), and everything seemed to be
                 * working fine, except that the pause() just ignored SIGALRM.
                 * I thought maybe the itimer wasn't being fired, so I hit
                 * it with a SIGALRM from the command line, and it ignored
                 * that, too.  SIGUSR1 woke it up just fine, and it proceeded
                 * to repoll--but, when the dummy server didn't respond, it
                 * never timed out, and SIGALRM wouldn't make it.
                 *
                 * (continued below...)
                 */
                struct itimerval ntimeout;

                ntimeout.it_interval.tv_sec = 5; /* repeat alarm every 5 secs */
                ntimeout.it_interval.tv_usec = 0;
                ntimeout.it_value.tv_sec  = run.poll_interval;
                ntimeout.it_value.tv_usec = 0;

                siginterrupt(SIGALRM, 1);
                alarm_latch = FALSE;
                signal(SIGALRM, gotsigalrm);    /* first trap signals */
                setitimer(ITIMER_REAL,&ntimeout,NULL);  /* then start timer */
                /* there is a very small window between the next two lines */
                /* which could result in a deadlock.  But this will now be  */
                /* caught by periodical alarms (see it_interval) */
                if (!alarm_latch)
                    pause();
                /* stop timer */
                ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0;
                ntimeout.it_value.tv_sec  = ntimeout.it_value.tv_usec = 0;
                setitimer(ITIMER_REAL,&ntimeout,NULL);  /* now stop timer */
                signal(SIGALRM, SIG_IGN);
#else
                /* 
                 * So the workaround I used is to make it sleep by using
                 * select() instead of setitimer()/pause().  select() is
                 * perfectly happy being called with a timeout and
                 * no file descriptors; it just sleeps until it hits the
                 * timeout.  The only concern I had was that it might
                 * implement its timeout with SIGALRM--there are some
                 * Unices where this is done, because select() is a library
                 * function--but apparently not.
                 */
                struct timeval timeout;

                timeout.tv_sec = run.poll_interval;
                timeout.tv_usec = 0;
                do {
                    lastsig = 0;
                    select(0,0,0,0, &timeout);
                } while (lastsig == SIGCHLD);
#endif
#else /* EMX */
                alarm_latch = FALSE;
                signal(SIGALRM, gotsigalrm);
                _beginthread(itimerthread, NULL, 32768, NULL);
                /* see similar code above */
                if (!alarm_latch)
                    pause();
                signal(SIGALRM, SIG_IGN);
#endif /* ! EMX */
                if (lastsig == SIGUSR1
                        || ((run.poll_interval && !getuid()) && lastsig == SIGHUP))
                {
#ifdef SYS_SIGLIST_DECLARED
                    report(stdout, 
                           _("awakened by %s\n"), sys_siglist[lastsig]);
#else
                    report(stdout, 
                           _("awakened by signal %d\n"), lastsig);
#endif
                    /* received a wakeup - unwedge all servers in case */
                    /* the problem has been manually repaired          */
                    for (ctl = querylist; ctl; ctl = ctl->next)
                        ctl->wedged = FALSE;
                }
            }

            /* now lock out interrupts again */
            signal(SIGUSR1, SIG_IGN);
            if (!getuid())
                signal(SIGHUP, SIG_IGN);

            if (outlevel >= O_VERBOSE)
                report(stdout, _("awakened at %s\n"), rfc822timestamp());
        }
    } while
        (run.poll_interval);

    if (outlevel >= O_VERBOSE)
        report(stdout, _("normal termination, status %d\n"),
                successes ? PS_SUCCESS : querystatus);

    terminate_run(0);
    exit(successes ? PS_SUCCESS : querystatus);
}

static void optmerge(struct query *h2, struct query *h1, int force)
/* merge two options records */
{
    /*
     * If force is off, modify h2 fields only when they're empty (treat h1
     * as defaults).  If force is on, modify each h2 field whenever h1
     * is nonempty (treat h1 as an override).  
     */
#define LIST_MERGE(dstl, srcl) if (force ? !!srcl : !dstl) \
                                                free_str_list(&dstl), \
                                                append_str_list(&dstl, &srcl)
    LIST_MERGE(h2->server.localdomains, h1->server.localdomains);
    LIST_MERGE(h2->localnames, h1->localnames);
    LIST_MERGE(h2->mailboxes, h1->mailboxes);
    LIST_MERGE(h2->smtphunt, h1->smtphunt);
    LIST_MERGE(h2->antispam, h1->antispam);
#undef LIST_MERGE

#define FLAG_MERGE(fld) if (force ? !!h1->fld : !h2->fld) h2->fld = h1->fld
    FLAG_MERGE(server.via);
    FLAG_MERGE(server.protocol);
#if INET6_ENABLE
    FLAG_MERGE(server.service);
    FLAG_MERGE(server.netsec);
#else /* INET6_ENABLE */
    FLAG_MERGE(server.port);
#endif /* INET6_ENABLE */
    FLAG_MERGE(server.interval);
    FLAG_MERGE(server.preauthenticate);
    FLAG_MERGE(server.timeout);
    FLAG_MERGE(server.envelope);
    FLAG_MERGE(server.envskip);
    FLAG_MERGE(server.qvirtual);
    FLAG_MERGE(server.skip);
    FLAG_MERGE(server.dns);
    FLAG_MERGE(server.checkalias);
    FLAG_MERGE(server.uidl);

#if defined(linux) || defined(__FreeBSD__)
    FLAG_MERGE(server.interface);
    FLAG_MERGE(server.monitor);
    FLAG_MERGE(server.interface_pair);
#endif /* linux || defined(__FreeBSD__) */

    FLAG_MERGE(server.plugin);
    FLAG_MERGE(server.plugout);

    FLAG_MERGE(wildcard);
    FLAG_MERGE(remotename);
    FLAG_MERGE(password);
    FLAG_MERGE(mda);
    FLAG_MERGE(bsmtp);
    FLAG_MERGE(listener);
    FLAG_MERGE(smtpaddress);
    FLAG_MERGE(preconnect);
    FLAG_MERGE(postconnect);

    FLAG_MERGE(keep);
    FLAG_MERGE(flush);
    FLAG_MERGE(fetchall);
    FLAG_MERGE(rewrite);
    FLAG_MERGE(forcecr);
    FLAG_MERGE(stripcr);
    FLAG_MERGE(pass8bits);
    FLAG_MERGE(dropstatus);
    FLAG_MERGE(mimedecode);
    FLAG_MERGE(limit);
    FLAG_MERGE(warnings);
    FLAG_MERGE(fetchlimit);
    FLAG_MERGE(batchlimit);
#ifdef  SSL_ENABLE
    FLAG_MERGE(use_ssl);
    FLAG_MERGE(sslkey);
    FLAG_MERGE(sslcert);
#endif
    FLAG_MERGE(expunge);

    FLAG_MERGE(properties);
#undef FLAG_MERGE
}

static int load_params(int argc, char **argv, int optind)
{
    int implicitmode, st;
    struct passwd *pw;
    struct query def_opts, *ctl;
    struct stat rcstat;

    run.bouncemail = TRUE;

    memset(&def_opts, '\0', sizeof(struct query));
    def_opts.smtp_socket = -1;
    def_opts.smtpaddress = (char *)0;
#define ANTISPAM(n)     save_str(&def_opts.antispam, STRING_DUMMY, 0)->val.status.num = (n)
    ANTISPAM(571);      /* sendmail */
    ANTISPAM(550);      /* old exim */
    ANTISPAM(501);      /* new exim */
    ANTISPAM(554);      /* Postfix */
#undef ANTISPAM

    def_opts.server.protocol = P_AUTO;
    def_opts.server.timeout = CLIENT_TIMEOUT;
    def_opts.warnings = WARNING_INTERVAL;
    def_opts.remotename = user;
    def_opts.listener = SMTP_MODE;

    /* note the parse time, so we can pick up on modifications */
    parsetime = 0;      /* foil compiler warnings */
    if (stat(rcfile, &rcstat) != -1)
        parsetime = rcstat.st_mtime;
    else if (errno != ENOENT)
        report(stderr, _("couldn't time-check the run-control file\n"));

    /* this builds the host list */
    if ((st = prc_parse_file(rcfile, !versioninfo)) != 0)
        /*
         * FIXME: someday, send notification mail here if backgrounded.
         * Right now, that can happen if the user changes the rcfile
         * while the fetchmail is running in background.  Do similarly
         * for the other exit() calls in this function.
         */
        exit(st);

    if ((implicitmode = (optind >= argc)))
    {
        for (ctl = querylist; ctl; ctl = ctl->next)
            ctl->active = TRUE;
    }
    else
        for (; optind < argc; optind++) 
        {
            flag        predeclared =  FALSE;

            /*
             * If hostname corresponds to a host known from the rc file,
             * simply declare it active.  Otherwise synthesize a host
             * record from command line and defaults
             */
            for (ctl = querylist; ctl; ctl = ctl->next)
                if (!strcmp(ctl->server.pollname, argv[optind])
                        || str_in_list(&ctl->server.akalist, argv[optind], TRUE))
                {
                    /* Is this correct? */
                    if(predeclared)
                        fprintf(stderr,_("Warning: multiple mentions of host %s in config file\n"),argv[optind]);
                    ctl->active = TRUE;
                    predeclared = TRUE;
                }

            if (!predeclared)
            {
                /*
                 * Allocate and link record without copying in
                 * command-line args; we'll do that with the optmerge
                 * call later on.
                 */
                ctl = hostalloc((struct query *)NULL);
                ctl->server.via =
                    ctl->server.pollname = xstrdup(argv[optind]);
                ctl->active = TRUE;
                ctl->server.lead_server = (struct hostdata *)NULL;
            }
        }

    /*
     * If there's a defaults record, merge it and lose it.
     */ 
    if (querylist && strcmp(querylist->server.pollname, "defaults") == 0)
    {
        for (ctl = querylist->next; ctl; ctl = ctl->next)
            optmerge(ctl, querylist, FALSE);
        querylist = querylist->next;
    }

    /* don't allow a defaults record after the first */
    for (ctl = querylist; ctl; ctl = ctl->next)
        if (ctl != querylist && strcmp(ctl->server.pollname, "defaults") == 0)
            exit(PS_SYNTAX);

    /* use localhost if we never fetch the FQDN of this host */
    fetchmailhost = "localhost";

    /* here's where we override globals */
    if (cmd_run.logfile)
        run.logfile = cmd_run.logfile;
    if (cmd_run.idfile)
        run.idfile = cmd_run.idfile;
    /* do this before the keep/fetchall test below, otherwise -d0 may fail */
    if (cmd_run.poll_interval >= 0)
        run.poll_interval = cmd_run.poll_interval;
    if (cmd_run.invisible)
        run.invisible = cmd_run.invisible;
    if (cmd_run.use_syslog)
        run.use_syslog = (cmd_run.use_syslog == FLAG_TRUE);
    if (cmd_run.postmaster)
        run.postmaster = cmd_run.postmaster;
    if (cmd_run.bouncemail)
        run.bouncemail = cmd_run.bouncemail;

    /* check and daemon options are not compatible */
    if (check_only && run.poll_interval)
        run.poll_interval = 0;

    /* merge in wired defaults, do sanity checks and prepare internal fields */
    for (ctl = querylist; ctl; ctl = ctl->next)
    {
        ctl->wedged = FALSE;

        if (configdump || (ctl->active && !(implicitmode && ctl->server.skip)))
        {
            /* merge in defaults */
            optmerge(ctl, &def_opts, FALSE);

            /* force command-line options */
            optmerge(ctl, &cmd_opts, TRUE);

            /* this code enables flags to be turned off */
#define DEFAULT(flag, dflt)     if (flag == FLAG_TRUE)\
                                        flag = TRUE;\
                                else if (flag == FLAG_FALSE)\
                                        flag = FALSE;\
                                else\
                                        flag = (dflt)
            DEFAULT(ctl->keep, FALSE);
            DEFAULT(ctl->fetchall, FALSE);
            DEFAULT(ctl->flush, FALSE);
            DEFAULT(ctl->rewrite, TRUE);
            DEFAULT(ctl->stripcr, (ctl->mda != (char *)NULL)); 
            DEFAULT(ctl->forcecr, FALSE);
            DEFAULT(ctl->pass8bits, FALSE);
            DEFAULT(ctl->dropstatus, FALSE);
            DEFAULT(ctl->mimedecode, FALSE);
            DEFAULT(ctl->server.dns, TRUE);
            DEFAULT(ctl->server.uidl, FALSE);
#ifdef  SSL_ENABLE
            DEFAULT(ctl->use_ssl, FALSE);
#endif
            DEFAULT(ctl->server.checkalias, FALSE);
#undef DEFAULT

            /*
             * DNS support is required for some protocols.  We used to
             * do this unconditionally, but it made fetchmail excessively
             * vulnerable to misconfigured DNS setups.
             *
             * If we're using ETRN, the smtp hunt list is the list of
             * systems we're polling on behalf of; these have to be 
             * fully-qualified domain names.  The default for this list
             * should be the FQDN of localhost.
             *
             * If we're using Kerberos for authentication, we need 
             * the FQDN in order to generate capability keys.
             */
            if (ctl->server.protocol == P_ETRN
                         || ctl->server.preauthenticate == A_KERBEROS_V4
                         || ctl->server.preauthenticate == A_KERBEROS_V5)
                if (strcmp(fetchmailhost, "localhost") == 0)
                        fetchmailhost = host_fqdn();

            /*
             * Make sure we have a nonempty host list to forward to.
             */
            if (!ctl->smtphunt)
                save_str(&ctl->smtphunt, fetchmailhost, FALSE);

            /* if `user' doesn't name a real local user, try to run as root */
            if ((pw = getpwnam(user)) == (struct passwd *)NULL)
                ctl->uid = 0;
            else
                ctl->uid = pw->pw_uid;  /* for local delivery via MDA */
            if (!ctl->localnames)       /* for local delivery via SMTP */
                save_str_pair(&ctl->localnames, user, NULL);

#if !defined(HAVE_GETHOSTBYNAME) || !defined(HAVE_RES_SEARCH)
            /* can't handle multidrop mailboxes unless we can do DNS lookups */
            if (ctl->localnames && ctl->localnames->next && ctl->server.dns)
            {
                ctl->server.dns = FALSE;
                report(stderr, _("fetchmail: warning: no DNS available to check multidrop fetches from %s\n"), ctl->server.pollname);
            }
#endif /* !HAVE_GETHOSTBYNAME || !HAVE_RES_SEARCH */

            /*
             *
             * Compute the true name of the mailserver host.  
             * There are two clashing cases here:
             *
             * (1) The poll name is a label, possibly on one of several
             *     poll configurations for the same host.  In this case 
             *     the `via' option will be present and give the true name.
             *
             * (2) The poll name is the true one, the via name is 
             *     localhost.   This is going to be typical for ssh-using
             *     configurations.
             *
             * We're going to assume the via name is true unless it's
             * localhost.
             */
            if (ctl->server.via && strcmp(ctl->server.via, "localhost"))
                ctl->server.queryname = xstrdup(ctl->server.via);
            else
                ctl->server.queryname = xstrdup(ctl->server.pollname);

#ifdef HESIOD
        /* If either the pollname or vianame are "hesiod" we want to
           lookup the user's hesiod pobox host */

        if (!strcasecmp(ctl->server.queryname, "hesiod")) {
            struct hes_postoffice *hes_p;
            hes_p = hes_getmailhost(ctl->remotename);
            if (hes_p != NULL && strcmp(hes_p->po_type, "POP") == 0) {
                 free(ctl->server.queryname);
                 ctl->server.queryname = xstrdup(hes_p->po_host);
                 if (ctl->server.via)
                     free(ctl->server.via);
                 ctl->server.via = xstrdup(hes_p->po_host);
            } else {
                 report(stderr,
                        _("couldn't find HESIOD pobox for %s\n"),
                        ctl->remotename);
            }
        }
#endif /* HESIOD */

            /*
             * We may have to canonicalize the server truename for later use.
             * Do this just once for each lead server, if necessary, in order
             * to minimize DNS round trips.
             */
            if (ctl->server.lead_server)
            {
                char    *leadname = ctl->server.lead_server->truename;

                /* prevent core dump from ill-formed or duplicate entry */
                if (!leadname)
                {
                    report(stderr, 
                           _("Lead server has no name.\n"));
                    exit(PS_SYNTAX);
                }

                ctl->server.truename = xstrdup(leadname);
            }
#ifdef HAVE_GETHOSTBYNAME
            else if (ctl->server.preauthenticate==A_KERBEROS_V4 ||
                ctl->server.preauthenticate==A_KERBEROS_V5 ||
                (ctl->server.dns && MULTIDROP(ctl)))
            {
                struct hostent  *namerec;

                /* compute the canonical name of the host */
                errno = 0;
                namerec = gethostbyname(ctl->server.queryname);
                if (namerec == (struct hostent *)NULL)
                {
                    report(stderr,
                          _("couldn't find canonical DNS name of %s\n"),
                          ctl->server.pollname);
                    exit(PS_DNS);
                }
                else
                    ctl->server.truename=xstrdup((char *)namerec->h_name);
            }
#endif /* HAVE_GETHOSTBYNAME */
            else
                ctl->server.truename = xstrdup(ctl->server.queryname);

            /* if no folders were specified, set up the null one as default */
            if (!ctl->mailboxes)
                save_str(&ctl->mailboxes, (char *)NULL, 0);

            /* maybe user overrode timeout on command line? */
            if (ctl->server.timeout == -1)      
                ctl->server.timeout = CLIENT_TIMEOUT;

#if !INET6_ENABLE
            /* sanity checks */
            if (ctl->server.port < 0)
            {
                (void) fprintf(stderr,
                               _("%s configuration invalid, port number cannot be negative\n"),
                               ctl->server.pollname);
                exit(PS_SYNTAX);
            }
            if (ctl->server.protocol == P_RPOP && ctl->server.port >= 1024)
            {
                (void) fprintf(stderr,
                               _("%s configuration invalid, RPOP requires a privileged port\n"),
                               ctl->server.pollname);
                exit(PS_SYNTAX);
            }
            if (ctl->listener == LMTP_MODE)
            {
                struct idlist   *idp;

                for (idp = ctl->smtphunt; idp; idp = idp->next)
                {
                    char        *cp;

                    if (!(cp = strrchr(idp->id, '/')) ||
                                (atoi(++cp) == SMTP_PORT))
                    {
                        (void) fprintf(stderr,
                                       _("%s configuration invalid, LMTP can't use default SMTP port\n"),
                                       ctl->server.pollname);
                        exit(PS_SYNTAX);
                    }
                }
            }
#endif /* !INET6_ENABLE */

            /*
             * "I beg to you, have mercy on the week minds like myself."
             * wrote Pehr Anderson.  Your petition is granted.
             */
            if (ctl->fetchall && ctl->keep && run.poll_interval && !nodetach)
            {
                (void) fprintf(stderr,
                               _("Both fetchall and keep on in daemon mode is a mistake!\n"));
                exit(PS_SYNTAX);
            }
        }
    }

#ifdef POP3_ENABLE
    /* initialize UID handling */
    if (!versioninfo && (st = prc_filecheck(run.idfile, !versioninfo)) != 0)
        exit(st);
    else
        initialize_saved_lists(querylist, run.idfile);
#endif /* POP3_ENABLE */

    /*
     * If the user didn't set a last-resort user to get misaddressed
     * multidrop mail, set an appropriate default here.
     */
    if (!run.postmaster)
    {
        if (getuid())                           /* ordinary user */
            run.postmaster = user;
        else                                    /* root */
            run.postmaster = "postmaster";
    }

    return(implicitmode);
}

static void terminate_poll(int sig)
/* to be executed at the end of a poll cycle */
{
    /*
     * Close all SMTP delivery sockets.  For optimum performance
     * we'd like to hold them open til end of run, but (1) this
     * loses if our poll interval is longer than the MTA's inactivity
     * timeout, and (2) some MTAs (like smail) don't deliver after
     * each message, but rather queue up mail and wait to actually
     * deliver it until the input socket is closed. 
     *
     * Sending SMTP QUIT on signal is theoretically nice, but led to a 
     * subtle bug.  If fetchmail was terminated by signal while it was 
     * shipping message text, it would hang forever waiting for a
     * command acknowledge.  In theory we could enable the QUIT
     * only outside of the message send.  In practice, we don't
     * care.  All mailservers hang up on a dropped TCP/IP connection
     * anyway.
     */

    if (sig != 0)
        report(stdout, _("terminated with signal %d\n"), sig);
    else
    {
        struct query *ctl;

        /* terminate all SMTP connections cleanly */
        for (ctl = querylist; ctl; ctl = ctl->next)
            if (ctl->smtp_socket != -1)
            {
                SMTP_quit(ctl->smtp_socket);
                SockClose(ctl->smtp_socket);
                ctl->smtp_socket = -1;
            }
    }

#ifdef POP3_ENABLE
    /*
     * Update UID information at end of each poll, rather than at end
     * of run, because that way we don't lose all UIDL information since
     * the beginning of time if fetchmail crashes.
     */
    if (!check_only)
        write_saved_lists(querylist, run.idfile);
#endif /* POP3_ENABLE */
}

static void terminate_run(int sig)
/* to be executed on normal or signal-induced termination */
{
    struct query        *ctl;

    terminate_poll(sig);

    /* 
     * Craig Metz, the RFC1938 one-time-password guy, points out:
     * "Remember that most kernels don't zero pages before handing them to the
     * next process and many kernels share pages between user and kernel space.
     * You'd be very surprised what you can find from a short program to do a
     * malloc() and then dump the contents of the pages you got. By zeroing
     * the secrets at end of run (earlier if you can), you make sure the next
     * guy can't get the password/pass phrase."
     *
     * Right you are, Craig!
     */
    for (ctl = querylist; ctl; ctl = ctl->next)
        if (ctl->password)
          memset(ctl->password, '\0', strlen(ctl->password));

#if !defined(HAVE_ATEXIT) && !defined(HAVE_ON_EXIT)
    unlockit();
#endif

    exit(successes ? PS_SUCCESS : querystatus);
}

/*
 * Sequence of protocols to try when autoprobing, most capable to least.
 */
static const int autoprobe[] = 
{
#ifdef IMAP_ENABLE
    P_IMAP,
#endif /* IMAP_ENABLE */
#ifdef POP3_ENABLE
    P_POP3,
#endif /* POP3_ENABLE */
#ifdef POP2_ENABLE
    P_POP2
#endif /* POP2_ENABLE */
};

static int query_host(struct query *ctl)
/* perform fetch transaction with single host */
{
    int i, st;

    /*
     * If we're syslogging the progress messages are automatically timestamped.
     * Force timestamping if we're going to a logfile.
     */
    if (outlevel >= O_VERBOSE || (run.logfile && outlevel > O_SILENT))
    {
        report(stdout, _("%s querying %s (protocol %s) at %s\n"),
               VERSION,
               ctl->server.pollname,
               showproto(ctl->server.protocol),
               rfc822timestamp());
    }
    switch (ctl->server.protocol) {
    case P_AUTO:
        for (i = 0; i < sizeof(autoprobe)/sizeof(autoprobe[0]); i++)
        {
            ctl->server.protocol = autoprobe[i];
            if ((st = query_host(ctl)) == PS_SUCCESS || st == PS_NOMAIL || st == PS_AUTHFAIL || st == PS_LOCKBUSY || st == PS_SMTP)
                break;
        }
        ctl->server.protocol = P_AUTO;
        return(st);
    case P_POP2:
#ifdef POP2_ENABLE
        return(doPOP2(ctl));
#else
        report(stderr, _("POP2 support is not configured.\n"));
        return(PS_PROTOCOL);
#endif /* POP2_ENABLE */
        break;
    case P_POP3:
    case P_APOP:
    case P_RPOP:
#ifdef POP3_ENABLE
        return(doPOP3(ctl));
#else
        report(stderr, _("POP3 support is not configured.\n"));
        return(PS_PROTOCOL);
#endif /* POP3_ENABLE */
        break;
    case P_IMAP:
    case P_IMAP_K4:
    case P_IMAP_CRAM_MD5:
    case P_IMAP_LOGIN:
#ifdef GSSAPI
    case P_IMAP_GSS:
#endif /* GSSAPI */
#ifdef IMAP_ENABLE
        return(doIMAP(ctl));
#else
        report(stderr, _("IMAP support is not configured.\n"));
        return(PS_PROTOCOL);
#endif /* IMAP_ENABLE */
    case P_ETRN:
#ifndef ETRN_ENABLE
        report(stderr, _("ETRN support is not configured.\n"));
        return(PS_PROTOCOL);
#else
#ifdef HAVE_GETHOSTBYNAME
        return(doETRN(ctl));
#else
        report(stderr, _("Cannot support ETRN without gethostbyname(2).\n"));
        return(PS_PROTOCOL);
#endif /* HAVE_GETHOSTBYNAME */
#endif /* ETRN_ENABLE */
    default:
        report(stderr, _("unsupported protocol selected.\n"));
        return(PS_PROTOCOL);
    }
}

static void dump_params (struct runctl *runp,
                         struct query *querylist, flag implicit)
/* display query parameters in English */
{
    struct query *ctl;

    if (runp->poll_interval)
        printf(_("Poll interval is %d seconds\n"), runp->poll_interval);
    if (runp->logfile)
        printf(_("Logfile is %s\n"), runp->logfile);
    if (strcmp(runp->idfile, IDFILE_NAME))
        printf(_("Idfile is %s\n"), runp->idfile);
#if defined(HAVE_SYSLOG)
    if (runp->use_syslog)
        printf(_("Progress messages will be logged via syslog\n"));
#endif
    if (runp->invisible)
        printf(_("Fetchmail will masquerade and will not generate Received\n"));
    if (runp->postmaster)
        printf(_("Fetchmail will forward misaddressed multidrop messages to %s.\n"),
               runp->postmaster);

    if (!runp->bouncemail)
        printf(_("Fetchmail will direct error mail to the postmaster.\n"));
    else if (outlevel >= O_VERBOSE)
        printf(_("Fetchmail will direct error mail to the sender.\n"));

    for (ctl = querylist; ctl; ctl = ctl->next)
    {
        if (!ctl->active || (implicit && ctl->server.skip))
            continue;

        printf(_("Options for retrieving from %s@%s:\n"),
               ctl->remotename, visbuf(ctl->server.pollname));

        if (ctl->server.via && (ctl->server.protocol != P_ETRN))
            printf(_("  Mail will be retrieved via %s\n"), ctl->server.via);

        if (ctl->server.interval)
            printf(_("  Poll of this server will occur every %d intervals.\n"),
                   ctl->server.interval);
        if (ctl->server.truename)
            printf(_("  True name of server is %s.\n"), ctl->server.truename);
        if (ctl->server.skip || outlevel >= O_VERBOSE)
            printf(_("  This host %s be queried when no host is specified.\n"),
                   ctl->server.skip ? _("will not") : _("will"));
        /*
         * Don't poll for password when there is one or when using the ETRN
         * or IMAP-GSS protocol
         */
        /* ETRN, IMAP_GSS, and IMAP_K4 do not need a password, so skip this */
        if ( (ctl->server.protocol != P_ETRN)
#ifdef GSSAPI
                                && (ctl->server.protocol != P_IMAP_GSS)
#endif /* GSSAPI */
                                && (ctl->server.protocol != P_IMAP_K4) ) {
                if (!ctl->password)
                        printf(_("  Password will be prompted for.\n"));
                else if (outlevel >= O_VERBOSE)
                {
                        if (ctl->server.protocol == P_APOP)
                                printf(_("  APOP secret = \"%s\".\n"),
                                                        visbuf(ctl->password));
                        else if (ctl->server.protocol == P_RPOP)
                                printf(_("  RPOP id = \"%s\".\n"),
                                                        visbuf(ctl->password));
                        else
                                printf(_("  Password = \"%s\".\n"),
                                                        visbuf(ctl->password));
                }
        }

        if (ctl->server.protocol == P_POP3 
#if INET6_ENABLE
            && ctl->server.service && !strcmp(ctl->server.service, KPOP_PORT)
#else /* INET6_ENABLE */
            && ctl->server.port == KPOP_PORT
#endif /* INET6_ENABLE */
            && (ctl->server.preauthenticate == A_KERBEROS_V4 ||
                ctl->server.preauthenticate == A_KERBEROS_V5))
            printf(_("  Protocol is KPOP with Kerberos %s authentication"),
                   ctl->server.preauthenticate == A_KERBEROS_V5 ? "V" : "IV");
        else
            printf(_("  Protocol is %s"), showproto(ctl->server.protocol));
#if INET6_ENABLE
        if (ctl->server.service)
            printf(_(" (using service %s)"), ctl->server.service);
        if (ctl->server.netsec)
            printf(_(" (using network security options %s)"), ctl->server.netsec);
#else /* INET6_ENABLE */
        if (ctl->server.port)
            printf(_(" (using port %d)"), ctl->server.port);
#endif /* INET6_ENABLE */
        else if (outlevel >= O_VERBOSE)
            printf(_(" (using default port)"));
        if (ctl->server.uidl && (ctl->server.protocol != P_ETRN))
            printf(_(" (forcing UIDL use)"));
        putchar('.');
        putchar('\n');
        if (ctl->server.preauthenticate == A_KERBEROS_V4)
            printf(_("  Kerberos V4 preauthentication enabled.\n"));
        else if (ctl->server.preauthenticate == A_KERBEROS_V5)
            printf(_("  Kerberos V5 preauthentication enabled.\n"));
        else if (ctl->server.preauthenticate == A_SSH)
            printf(_("  End-to-end encryption assumed.\n"));
#ifdef  SSL_ENABLE
        if (ctl->use_ssl)
            printf("  SSL encrypted sessions enabled.\n");
#endif
        if (ctl->server.timeout > 0)
            printf(_("  Server nonresponse timeout is %d seconds"), ctl->server.timeout);
        if (ctl->server.timeout ==  CLIENT_TIMEOUT)
            printf(_(" (default).\n"));
        else
            printf(".\n");

        if (ctl->server.protocol != P_ETRN) {
                if (!ctl->mailboxes->id)
                    printf(_("  Default mailbox selected.\n"));
                else
                {
                    struct idlist *idp;

                    printf(_("  Selected mailboxes are:"));
                    for (idp = ctl->mailboxes; idp; idp = idp->next)
                        printf(" %s", idp->id);
                    printf("\n");
                }
                printf(_("  %s messages will be retrieved (--all %s).\n"),
                       ctl->fetchall ? _("All") : _("Only new"),
                       ctl->fetchall ? "on" : "off");
                printf(_("  Fetched messages %s be kept on the server (--keep %s).\n"),
                       ctl->keep ? _("will") : _("will not"),
                       ctl->keep ? "on" : "off");
                printf(_("  Old messages %s be flushed before message retrieval (--flush %s).\n"),
                       ctl->flush ? _("will") : _("will not"),
                       ctl->flush ? "on" : "off");
                printf(_("  Rewrite of server-local addresses is %s (--norewrite %s).\n"),
                       ctl->rewrite ? _("enabled") : _("disabled"),
                       ctl->rewrite ? "off" : "on");
                printf(_("  Carriage-return stripping is %s (stripcr %s).\n"),
                       ctl->stripcr ? _("enabled") : _("disabled"),
                       ctl->stripcr ? "on" : "off");
                printf(_("  Carriage-return forcing is %s (forcecr %s).\n"),
                       ctl->forcecr ? _("enabled") : _("disabled"),
                       ctl->forcecr ? "on" : "off");
                printf(_("  Interpretation of Content-Transfer-Encoding is %s (pass8bits %s).\n"),
                       ctl->pass8bits ? _("disabled") : _("enabled"),
                       ctl->pass8bits ? "on" : "off");
                printf(_("  MIME decoding is %s (mimedecode %s).\n"),
                       ctl->mimedecode ? _("enabled") : _("disabled"),
                       ctl->mimedecode ? "on" : "off");
                printf(_("  Nonempty Status lines will be %s (dropstatus %s)\n"),
                       ctl->dropstatus ? _("discarded") : _("kept"),
                       ctl->dropstatus ? "on" : "off");
                if (NUM_NONZERO(ctl->limit))
                {
                    if (NUM_NONZERO(ctl->limit))
                        printf(_("  Message size limit is %d octets (--limit %d).\n"), 
                               ctl->limit, ctl->limit);
                    else if (outlevel >= O_VERBOSE)
                        printf(_("  No message size limit (--limit 0).\n"));
                    if (run.poll_interval > 0)
                        printf(_("  Message size warning interval is %d seconds (--warnings %d).\n"), 
                               ctl->warnings, ctl->warnings);
                    else if (outlevel >= O_VERBOSE)
                        printf(_("  Size warnings on every poll (--warnings 0).\n"));
                }
                if (NUM_NONZERO(ctl->fetchlimit))
                    printf(_("  Received-message limit is %d (--fetchlimit %d).\n"),
                           ctl->fetchlimit, ctl->fetchlimit);
                else if (outlevel >= O_VERBOSE)
                    printf(_("  No received-message limit (--fetchlimit 0).\n"));
                if (NUM_NONZERO(ctl->batchlimit))
                    printf(_("  SMTP message batch limit is %d.\n"), ctl->batchlimit);
                else if (outlevel >= O_VERBOSE)
                    printf(_("  No SMTP message batch limit (--batchlimit 0).\n"));
                if (ctl->server.protocol == P_IMAP)
                {
                    if (NUM_NONZERO(ctl->expunge))
                        printf(_("  Deletion interval between expunges forced to %d (--expunge %d).\n"), ctl->expunge, ctl->expunge);
                    else if (outlevel >= O_VERBOSE)
                        printf(_("  No forced expunges (--expunge 0).\n"));
                }
        }
        if (ctl->bsmtp)
            printf(_("  Messages will be appended to %s as BSMTP\n"), visbuf(ctl->bsmtp));
        else if (ctl->mda && (ctl->server.protocol != P_ETRN))
            printf(_("  Messages will be delivered with \"%s\".\n"), visbuf(ctl->mda));
        else
        {
            struct idlist *idp;

            printf(_("  Messages will be %cMTP-forwarded to:"), ctl->listener);
            for (idp = ctl->smtphunt; idp; idp = idp->next)
            {
                printf(" %s", idp->id);
                if (!idp->val.status.mark)
                    printf(_(" (default)"));
            }
            printf("\n");
            if (ctl->smtpaddress)
                printf(_("  Host part of MAIL FROM line will be %s\n"),
                       ctl->smtpaddress);
        }
        if (ctl->server.protocol != P_ETRN)
        {
                if (ctl->antispam != (struct idlist *)NULL)
                {
                    struct idlist *idp;

                    printf(_("  Recognized listener spam block responses are:"));
                    for (idp = ctl->antispam; idp; idp = idp->next)
                        printf(" %d", idp->val.status.num);
                    printf("\n");
                }
                else if (outlevel >= O_VERBOSE)
                    printf(_("  Spam-blocking disabled\n"));
        }
        if (ctl->preconnect)
            printf(_("  Server connection will be brought up with \"%s\".\n"),
                   visbuf(ctl->preconnect));
        else if (outlevel >= O_VERBOSE)
            printf(_("  No pre-connection command.\n"));
        if (ctl->postconnect)
            printf(_("  Server connection will be taken down with \"%s\".\n"),
                   visbuf(ctl->postconnect));
        else if (outlevel >= O_VERBOSE)
            printf(_("  No post-connection command.\n"));
        if (ctl->server.protocol != P_ETRN) {
                if (!ctl->localnames)
                    printf(_("  No localnames declared for this host.\n"));
                else
                {
                    struct idlist *idp;
                    int count = 0;

                    for (idp = ctl->localnames; idp; idp = idp->next)
                        ++count;

                    if (count > 1 || ctl->wildcard)
                        printf(_("  Multi-drop mode: "));
                    else
                        printf(_("  Single-drop mode: "));

                    printf(_("%d local name(s) recognized.\n"), count);
                    if (outlevel >= O_VERBOSE)
                    {
                        for (idp = ctl->localnames; idp; idp = idp->next)
                            if (idp->val.id2)
                                printf("\t%s -> %s\n", idp->id, idp->val.id2);
                            else
                                printf("\t%s\n", idp->id);
                        if (ctl->wildcard)
                            fputs("\t*\n", stdout);
                    }

                    if (count > 1 || ctl->wildcard)
                    {
                        printf(_("  DNS lookup for multidrop addresses is %s.\n"),
                               ctl->server.dns ? _("enabled") : _("disabled"));
                        if (ctl->server.dns)
                        {
                            printf(_("  Server aliases will be compared with multidrop addresses by "));
                            if (ctl->server.checkalias)
                                printf(_("IP address.\n"));
                            else
                                printf(_("name.\n"));
                        }
                        if (ctl->server.envelope == STRING_DISABLED)
                            printf(_("  Envelope-address routing is disabled\n"));
                        else
                        {
                            printf(_("  Envelope header is assumed to be: %s\n"),
                                   ctl->server.envelope ? ctl->server.envelope:_("Received"));
                            if (ctl->server.envskip > 1 || outlevel >= O_VERBOSE)
                                printf(_("  Number of envelope header to be parsed: %d\n"),
                                       ctl->server.envskip);
                            if (ctl->server.qvirtual)
                                printf(_("  Prefix %s will be removed from user id\n"),
                                       ctl->server.qvirtual);
                            else if (outlevel >= O_VERBOSE) 
                                printf(_("  No prefix stripping\n"));
                        }

                        if (ctl->server.akalist)
                        {
                            struct idlist *idp;

                            printf(_("  Predeclared mailserver aliases:"));
                            for (idp = ctl->server.akalist; idp; idp = idp->next)
                                printf(" %s", idp->id);
                            putchar('\n');
                        }
                        if (ctl->server.localdomains)
                        {
                            struct idlist *idp;

                            printf(_("  Local domains:"));
                            for (idp = ctl->server.localdomains; idp; idp = idp->next)
                                printf(" %s", idp->id);
                            putchar('\n');
                        }
                    }
                }
        }
#if defined(linux) || defined(__FreeBSD__)
        if (ctl->server.interface)
            printf(_("  Connection must be through interface %s.\n"), ctl->server.interface);
        else if (outlevel >= O_VERBOSE)
            printf(_("  No interface requirement specified.\n"));
        if (ctl->server.monitor)
            printf(_("  Polling loop will monitor %s.\n"), ctl->server.monitor);
        else if (outlevel >= O_VERBOSE)
            printf(_("  No monitor interface specified.\n"));
#endif

        if (ctl->server.plugin)
            printf(_("  Server connections will be mode via plugin %s (--plugin %s).\n"), ctl->server.plugin, ctl->server.plugin);
        else if (outlevel >= O_VERBOSE)
            printf(_("  No plugin command specified.\n"));
        if (ctl->server.plugout)
            printf(_("  Listener connections will be mode via plugout %s (--plugout %s).\n"), ctl->server.plugout, ctl->server.plugout);
        else if (outlevel >= O_VERBOSE)
            printf(_("  No plugout command specified.\n"));

        if (ctl->server.protocol > P_POP2 && (ctl->server.protocol != P_ETRN))
        {
            if (!ctl->oldsaved)
                printf(_("  No UIDs saved from this host.\n"));
            else
            {
                struct idlist *idp;
                int count = 0;

                for (idp = ctl->oldsaved; idp; idp = idp->next)
                    ++count;

                printf(_("  %d UIDs saved.\n"), count);
                if (outlevel >= O_VERBOSE)
                    for (idp = ctl->oldsaved; idp; idp = idp->next)
                        printf("\t%s\n", idp->id);
            }
        }

        if (ctl->properties)
            printf(_("  Pass-through properties \"%s\".\n"),
                   visbuf(ctl->properties));
    }
}

/* fetchmail.c ends here */