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/*
* 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
#if defined(HAVE_ALLOCA_H)
#include <alloca.h>
#else
#ifdef _AIX
#pragma alloca
#endif
#endif
#include <string.h>
#include <signal.h>
#if defined(HAVE_SYSLOG)
#include <syslog.h>
#endif
#include <pwd.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_GETHOSTBYNAME
#include <netdb.h>
#endif /* HAVE_GETHOSTBYNAME */
#include "fetchmail.h"
#include "tunable.h"
#include "smtp.h"
#include "getopt.h"
#include "netrc.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 query *);
static int query_host(struct query *);
/* controls the detail level of status/progress messages written to stderr */
int outlevel; /* see the O_.* constants above */
/* daemon mode control */
flag nodetach; /* if TRUE, don't detach daemon process */
flag quitmode; /* if --quit was set */
flag check_only; /* if --probe was set */
char *cmd_logfile; /* if --logfile was set */
int cmd_daemon; /* if --daemon was set */
/* miscellaneous global controls */
char *idfile; /* UID list file */
flag versioninfo; /* emit only version info */
char *user; /* the name of the invoking user */
char *home;
char *fetchmailhost; /* the name of the host running fetchmail */
char *program_name; /* the name to prefix error messages with */
#if NETSEC
void *request = NULL;
int requestlen = 0;
#endif /* NETSEC */
static char *lockfile; /* name of lockfile */
static int querystatus; /* status of query */
static int successes; /* count number of successful polls */
static int lastsig; /* last signal received */
static void termhook(); /* forward declaration of exit hook */
RETSIGTYPE donothing(sig) 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) */
{
unlink(lockfile);
}
int main (int argc, char **argv)
{
int st, bkgd = FALSE;
int parsestatus, implicitmode = FALSE;
struct query *ctl;
FILE *lockfp;
netrc_entry *netrc_list;
char *netrc_file, tmpbuf[BUFSIZ];
pid_t pid;
envquery(argc, argv);
#define IDFILE_NAME ".fetchids"
idfile = (char *) xmalloc(strlen(home)+strlen(IDFILE_NAME)+2);
strcpy(idfile, home);
strcat(idfile, "/");
strcat(idfile, IDFILE_NAME);
outlevel = O_NORMAL;
if ((parsestatus = parsecmdline(argc,argv,&cmd_opts)) < 0)
exit(PS_SYNTAX);
/* this hint to stdio should help messages come out in the right order */
setvbuf(stdout, NULL, _IOLBF, POPBUFSIZE);
if (versioninfo)
{
printf("This is fetchmail release %s", RELEASE_ID);
#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 RPA_ENABLE
printf("+RPA");
#endif /* RPA_ENABLE */
#ifndef ETRN_ENABLE
printf("-ETRN");
#endif /* ETRN_ENABLE */
#if OPIE
printf("+OPIE");
#endif /* OPIE */
#if INET6
printf("+INET6");
#endif /* INET6 */
#if NETSEC
printf("+NETSEC");
#endif /* NETSEC */
putchar('\n');
/* 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);
/* set up to do lock protocol */
if (!getuid())
sprintf(tmpbuf, "%s/fetchmail.pid", PID_DIR);
else {
strcpy(tmpbuf, home);
strcat(tmpbuf, "/.fetchmail.pid");
}
/* perhaps we just want to check options? */
if (versioninfo) {
printf("Taking options from command line");
if (access(rcfile, 0))
printf("\n");
else
printf(" and %s\n", rcfile);
if (poll_interval)
printf("Poll interval is %d seconds\n", poll_interval);
if (outlevel == O_VERBOSE)
printf("Lockfile at %s\n", tmpbuf);
if (logfile)
printf("Logfile is %s\n", logfile);
#if defined(HAVE_SYSLOG)
if (errors_to_syslog)
printf("Progress messages will be logged via syslog\n");
#endif
if (use_invisible)
printf("Fetchmail will masquerade and will not generate Received\n");
for (ctl = querylist; ctl; ctl = ctl->next) {
if (ctl->active && !(implicitmode && ctl->server.skip))
dump_params(ctl);
}
if (querylist == NULL)
(void) fprintf(stderr,
"No mailservers set up -- perhaps %s is missing?\n", rcfile);
exit(0);
}
/* check for another fetchmail running concurrently */
pid = -1;
if ((lockfile = (char *) malloc(strlen(tmpbuf) + 1)) == NULL)
{
fprintf(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);
}
/* 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)
{
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);
}
}
/* parse the ~/.netrc file (if present) for future password lookups. */
netrc_file = (char *) xmalloc (strlen (home) + 8);
strcpy (netrc_file, home);
strcat (netrc_file, "/.netrc");
netrc_list = parse_netrc(netrc_file);
/* 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->password)
{
if (ctl->server.preauthenticate == A_KERBEROS_V4 || ctl->server.protocol == P_IMAP_K4 || ctl->server.protocol == P_IMAP_GSS)
/* Server won't care what the password is, but there
must be some non-null string here. */
ctl->password = ctl->remotename;
else
{
/* look up the host and account in the .netrc file. */
netrc_entry *p = search_netrc(netrc_list,ctl->server.pollname);
while (p && strcmp(p->account, ctl->remotename))
p = search_netrc(p->next, ctl->remotename);
/* if we find a matching entry with a password, use it */
if (p && p->password)
ctl->password = xstrdup(p->password);
}
if (ctl->server.protocol != P_ETRN && ctl->server.protocol != P_IMAP_K4 && ctl->server.protocol != P_IMAP_GSS && !ctl->password)
{
(void) sprintf(tmpbuf, "Enter password for %s@%s: ",
ctl->remotename, ctl->server.pollname);
ctl->password = xstrdup((char *)getpassword(tmpbuf));
}
}
/*
* Maybe time to go to demon mode...
*/
#if defined(HAVE_SYSLOG)
if (errors_to_syslog)
{
openlog(program_name, LOG_PID, LOG_MAIL);
error_init(-1);
}
else
#endif
error_init(poll_interval == 0 && !logfile);
if (poll_interval)
{
if (!nodetach)
daemonize(logfile, termhook);
error( 0, 0, "starting fetchmail %s daemon ", RELEASE_ID);
/*
* 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 (poll_interval && !getuid())
signal(SIGHUP, SIG_IGN);
}
/* beyond here we don't want more than one fetchmail running per user */
umask(0077);
signal(SIGABRT, termhook);
signal(SIGINT, termhook);
signal(SIGTERM, termhook);
signal(SIGALRM, termhook);
signal(SIGPIPE, termhook);
signal(SIGQUIT, termhook);
/* here's the exclusion lock */
if ((lockfp = fopen(lockfile,"w")) != NULL) {
fprintf(lockfp,"%d",getpid());
if (poll_interval)
fprintf(lockfp," %d", poll_interval);
fclose(lockfp);
#ifdef HAVE_ATEXIT
atexit(unlockit);
#endif
#ifdef HAVE_ON_EXIT
on_exit(unlockit, (char *)NULL);
#endif
}
/*
* Query all hosts. If there's only one, the error return will
* reflect the status of that transaction.
*/
do {
#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))
{
/* check skip interval first so that it counts all polls */
if (poll_interval && ctl->server.interval)
{
if (ctl->server.poll_count++ % ctl->server.interval)
{
if (outlevel == O_VERBOSE)
fprintf(stderr,
"fetchmail: interval not reached, not querying %s\n",
ctl->server.pollname);
continue;
}
}
#if defined(linux) && !INET6
/* interface_approve() does its own error logging */
if (!interface_approve(&ctl->server))
continue;
#endif /* defined(linux) && !INET6 */
#ifdef HAVE_GETHOSTBYNAME
/*
* This functions partly as a probe to make sure our
* nameserver is still up. The multidrop case
* (especially) needs it.
*/
if (ctl->server.preauthenticate==A_KERBEROS_V4 || MULTIDROP(ctl))
{
struct hostent *namerec;
/* compute the canonical name of the host */
errno = 0;
namerec = gethostbyname(ctl->server.queryname);
if (namerec == (struct hostent *)NULL)
{
error(0, errno,
"skipping %s poll, ",
ctl->server.pollname);
if (errno)
{
if (errno == ENETUNREACH)
break; /* go to sleep */
}
#ifdef HAVE_HERROR /* NEXTSTEP doesn't */
else
herror("DNS error");
#endif /* HAVE_HERROR */
continue;
}
else
{
free(ctl->server.truename);
ctl->server.truename=xstrdup((char *)namerec->h_name);
}
}
#endif /* HAVE_GETHOSTBYNAME */
querystatus = query_host(ctl);
if (querystatus == PS_SUCCESS) {
successes++;
#ifdef POP3_ENABLE
if (!check_only)
update_str_lists(ctl);
#endif /* POP3_ENABLE */
}
#if defined(linux) && !INET6
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 */
}
}
#if defined(HAVE_RES_SEARCH) && defined(USE_TCPIP_FOR_DNS)
endhostent(); /* release TCP/IP connection to nameserver */
#endif /* HAVE_RES_SEARCH */
/*
* 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.
*/
for (ctl = querylist; ctl; ctl = ctl->next)
if (ctl->smtp_socket != -1)
{
SMTP_quit(ctl->smtp_socket);
close(ctl->smtp_socket);
ctl->smtp_socket = -1;
}
/*
* OK, we've polled. Now sleep.
*/
if (poll_interval)
{
if (outlevel == O_VERBOSE)
{
time_t now;
time(&now);
fprintf(stderr, "fetchmail: sleeping at %s", ctime(&now));
}
/*
* 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);
/*
* 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.
*/
{
struct itimerval ntimeout;
ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0;
ntimeout.it_value.tv_sec = poll_interval;
ntimeout.it_value.tv_usec = 0;
setitimer(ITIMER_REAL,&ntimeout,NULL);
signal(SIGALRM, donothing);
pause();
signal(SIGALRM, SIG_IGN);
if (lastsig == SIGUSR1
|| ((poll_interval && !getuid()) && lastsig == SIGHUP))
{
#ifdef SYS_SIGLIST_DECLARED
error(0, 0, "awakened by %s", sys_siglist[lastsig]);
#else
error(0, 0, "awakened by signal %d", lastsig);
#endif
}
}
/* now lock out interrupts again */
signal(SIGUSR1, SIG_IGN);
if (!getuid())
signal(SIGHUP, SIG_IGN);
if (outlevel == O_VERBOSE)
{
time_t now;
time(&now);
fprintf(stderr, "fetchmail: awakened at %s", ctime(&now));
}
}
} while
(poll_interval);
if (outlevel == O_VERBOSE)
fprintf(stderr,"fetchmail: normal termination, status %d\n",
successes ? PS_SUCCESS : querystatus);
termhook(0);
exit(successes ? PS_SUCCESS : querystatus);
}
static int load_params(int argc, char **argv, int optind)
{
int implicitmode, st;
struct passwd *pw;
struct query def_opts, *ctl;
memset(&def_opts, '\0', sizeof(struct query));
def_opts.smtp_socket = -1;
def_opts.smtpaddress = (char *)0;
def_opts.server.protocol = P_AUTO;
def_opts.server.timeout = CLIENT_TIMEOUT;
def_opts.remotename = user;
def_opts.expunge = 1;
/* this builds the host list */
if (prc_parse_file(rcfile, !versioninfo) != 0)
exit(PS_SYNTAX);
if ((implicitmode = (optind >= argc)))
{
for (ctl = querylist; ctl; ctl = ctl->next)
ctl->active = TRUE;
}
else
for (; optind < argc; optind++)
{
/*
* 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]))
goto foundit;
ctl = hostalloc(&cmd_opts);
ctl->server.pollname = xstrdup(argv[optind]);
foundit:
ctl->active = TRUE;
}
/* 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);
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);
/* merge in wired defaults, do sanity checks and prepare internal fields */
for (ctl = querylist; ctl; ctl = ctl->next)
{
if (ctl->active && !(implicitmode && ctl->server.skip))
{
/* merge in defaults */
optmerge(ctl, &def_opts);
/* make sure we have a nonempty host list to forward to */
if (!ctl->smtphunt)
save_str(&ctl->smtphunt, FALSE, fetchmailhost);
/* keep lusers from shooting themselves in the foot :-) */
if (poll_interval && ctl->limit)
{
fprintf(stderr,"fetchmail: you'd never see large messages!\n");
exit(PS_SYNTAX);
}
/* 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);
/* 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->server.dns, TRUE);
DEFAULT(ctl->server.uidl, FALSE);
#undef DEFAULT
#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;
fprintf(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.
*
* Each poll cycle, if we've got DNS, we'll try to canonicalize
* the name. This will function as a probe to ensure the
* host's nameserver is up.
*/
if (ctl->server.via && strcmp(ctl->server.via, "localhost"))
ctl->server.queryname = xstrdup(ctl->server.via);
else
ctl->server.queryname = xstrdup(ctl->server.pollname);
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, -1, (char *)NULL);
/* maybe user overrode timeout on command line? */
if (ctl->server.timeout == -1)
ctl->server.timeout = CLIENT_TIMEOUT;
#if !INET6
/* sanity checks */
if (ctl->server.port < 0)
{
(void) fprintf(stderr,
"%s configuration invalid, port number cannot be negative",
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",
ctl->server.pollname);
exit(PS_SYNTAX);
}
#endif /* !INET6 */
}
}
/* initialize UID handling */
if (!versioninfo && (st = prc_filecheck(idfile)) != 0)
exit(st);
#ifdef POP3_ENABLE
else
initialize_saved_lists(querylist, idfile);
#endif /* POP3_ENABLE */
/* if cmd_logfile was explicitly set, use it to override logfile */
if (cmd_logfile)
logfile = cmd_logfile;
/* likewise for poll_interval */
if (cmd_daemon >= 0)
poll_interval = cmd_daemon;
/* check and daemon options are not compatible */
if (check_only && poll_interval)
poll_interval = 0;
return(implicitmode);
}
void termhook(int sig)
/* to be executed on normal or signal-induced termination */
{
struct query *ctl;
/*
* 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)
error(0, 0, "terminated with signal %d", sig);
else
/* terminate all SMTP connections cleanly */
for (ctl = querylist; ctl; ctl = ctl->next)
if (ctl->smtp_socket != -1)
SMTP_quit(ctl->smtp_socket);
#ifdef POP3_ENABLE
if (!check_only)
write_saved_lists(querylist, idfile);
#endif /* POP3_ENABLE */
/*
* 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 (outlevel == O_VERBOSE)
{
time_t now;
time(&now);
fprintf(stderr, "fetchmail: %s querying %s (protocol %s) at %s",
RELEASE_ID,
ctl->server.pollname, showproto(ctl->server.protocol), ctime(&now));
}
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);
break;
case P_POP2:
#ifdef POP2_ENABLE
return(doPOP2(ctl));
#else
fprintf(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
fprintf(stderr, "POP3 support is not configured.\n");
return(PS_PROTOCOL);
#endif /* POP3_ENABLE */
break;
case P_IMAP:
case P_IMAP_K4:
case P_IMAP_GSS:
#ifdef IMAP_ENABLE
return(doIMAP(ctl));
#else
fprintf(stderr, "IMAP support is not configured.\n");
return(PS_PROTOCOL);
#endif /* IMAP_ENABLE */
break;
case P_ETRN:
#ifndef ETRN_ENABLE
fprintf(stderr, "ETRN support is not configured.\n");
return(PS_PROTOCOL);
#else
#ifdef HAVE_GETHOSTBYNAME
return(doETRN(ctl));
#else
fprintf(stderr, "Cannot support ETRN without gethostbyname(2).\n");
return(PS_PROTOCOL);
#endif /* HAVE_GETHOSTBYNAME */
#endif /* ETRN_ENABLE */
default:
error(0, 0, "unsupported protocol selected.");
return(PS_PROTOCOL);
}
}
void dump_params (struct query *ctl)
/* display query parameters in English */
{
printf("Options for retrieving from %s@%s:\n",
ctl->remotename, visbuf(ctl->server.pollname));
if (ctl->server.via)
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 will%s be queried when no host is specified.\n",
ctl->server.skip ? " not" : "");
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
&& !strcmp(ctl->server.service, KPOP_PORT)
#else /* INET6 */
&& ctl->server.port == KPOP_PORT
#endif /* INET6 */
&& ctl->server.preauthenticate == A_KERBEROS_V4)
printf(" Protocol is KPOP");
else
printf(" Protocol is %s", showproto(ctl->server.protocol));
#if INET6
if (ctl->server.service)
printf(" (using service %s)", ctl->server.service);
#else /* INET6 */
if (ctl->server.port)
printf(" (using port %d)", ctl->server.port);
#endif /* INET6 */
else if (outlevel == O_VERBOSE)
printf(" (using default port)");
if (ctl->server.uidl)
printf(" (forcing UIDL use)");
putchar('.');
putchar('\n');
if (ctl->server.preauthenticate == A_KERBEROS_V4)
printf(" Kerberos V4 preauthentication enabled.\n");
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->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 will%s be kept on the server (--keep %s).\n",
ctl->keep ? "" : " not",
ctl->keep ? "on" : "off");
printf(" Old messages will%s be flushed before message retrieval (--flush %s).\n",
ctl->flush ? "" : " not",
ctl->flush ? "on" : "off");
printf(" Rewrite of server-local addresses is %sabled (--norewrite %s).\n",
ctl->rewrite ? "en" : "dis",
ctl->rewrite ? "off" : "on");
printf(" Carriage-return stripping is %sabled (stripcr %s).\n",
ctl->stripcr ? "en" : "dis",
ctl->stripcr ? "on" : "off");
printf(" Carriage-return forcing is %sabled (forcecr %s).\n",
ctl->forcecr ? "en" : "dis",
ctl->forcecr ? "on" : "off");
printf(" Interpretation of Content-Transfer-Encoding is %sabled (pass8bits %s).\n",
ctl->pass8bits ? "dis" : "en",
ctl->pass8bits ? "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))
printf(" Message size limit is %d bytes (--limit %d).\n",
ctl->limit, ctl->limit);
else if (outlevel == O_VERBOSE)
printf(" No message size limit (--limit 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 is %d (--expunge %d).\n", ctl->expunge, ctl->expunge);
else if (outlevel == O_VERBOSE)
printf(" No expunges (--expunge 0).\n");
if (ctl->mda)
printf(" Messages will be delivered with '%s.'\n", visbuf(ctl->mda));
else
{
struct idlist *idp;
printf(" Messages will be SMTP-forwarded to:");
for (idp = ctl->smtphunt; idp; idp = idp->next)
if (ctl->server.protocol != P_ETRN || idp->val.num)
{
printf(" %s", idp->id);
if (!idp->val.num)
printf(" (default)");
}
printf("\n");
if (ctl->smtpaddress)
printf(" Host part of MAIL FROM line will be %s\n",
ctl->smtpaddress);
}
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->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("*\n", stdout);
}
if (count > 1 || ctl->wildcard)
{
printf(" DNS lookup for multidrop addresses is %sabled.\n",
ctl->server.dns ? "en" : "dis");
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');
}
}
}
#ifdef linux
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.protocol > P_POP2)
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)
fprintf(stderr, "\t%s\n", idp->id);
}
}
/* fetchmail.c ends here */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.