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/*
* driver.c -- generic driver for mail fetch method protocols
*
* Copyright 1997 by Eric S. Raymond
* For license terms, see the file COPYING in this directory.
*/
#include "config.h"
#include <stdio.h>
#include <setjmp.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif /* HAVE_MEMORY_H */
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#if defined(HAVE_STDARG_H)
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#if defined(HAVE_ALLOCA_H)
#include <alloca.h>
#else
#ifdef _AIX
#pragma alloca
#endif
#endif
#if defined(HAVE_SYS_ITIMER_H)
#include <sys/itimer.h>
#endif
#include <sys/time.h>
#include <signal.h>
#ifndef HAVE_STRFTIME /* For ctime prototype */
#include <sys/types.h>
#include <time.h>
#endif
#ifdef HAVE_GETHOSTBYNAME
#include <netdb.h>
#include "mx.h"
#endif /* HAVE_GETHOSTBYNAME */
#ifdef KERBEROS_V4
#if defined (__bsdi__)
#include <des.h> /* order of includes matters */
#include <krb.h>
#define krb_get_err_text(e) (krb_err_txt[e])
#else
#if defined(__FreeBSD__) || defined(__linux__)
#define krb_get_err_text(e) (krb_err_txt[e])
#include <krb.h>
#include <des.h>
#else
#include <krb.h>
#include <des.h>
#endif /* ! defined (__FreeBSD__) */
#endif /* ! defined (__bsdi__) */
#include <netinet/in.h>
#include <netdb.h>
#endif /* KERBEROS_V4 */
#include "fetchmail.h"
#include "socket.h"
#include "smtp.h"
/* BSD portability hack...I know, this is an ugly place to put it */
#if !defined(SIGCHLD) && defined(SIGCLD)
#define SIGCHLD SIGCLD
#endif
#if INET6
#define SMTP_PORT "smtp" /* standard SMTP service port */
#else /* INET6 */
#define SMTP_PORT 25 /* standard SMTP service port */
#endif /* INET6 */
#ifndef strstr /* glibc-2.1 declares this as a macro */
extern char *strstr(); /* needed on sysV68 R3V7.1. */
#endif /* strstr */
int fetchlimit; /* how often to tear down the server connection */
int batchcount; /* count of messages sent in current batch */
flag peek_capable; /* can we peek for better error recovery? */
int pass; /* how many times have we re-polled? */
static const struct method *protocol;
static jmp_buf restart;
char tag[TAGLEN];
static int tagnum;
#define GENSYM (sprintf(tag, "a%04d", ++tagnum % TAGMOD), tag)
static char *shroud; /* string to shroud in debug output, if non-NULL */
static int mytimeout; /* value of nonreponse timeout */
static int msglen; /* actual message length */
/* use these to track what was happening when the nonresponse timer fired */
#define GENERAL_WAIT 0
#define SERVER_WAIT 1
#define FORWARDING_WAIT 2
static phase;
static void set_timeout(int timeleft)
/* reset the nonresponse-timeout */
{
struct itimerval ntimeout;
ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0;
ntimeout.it_value.tv_sec = timeleft;
ntimeout.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &ntimeout, (struct itimerval *)NULL);
}
static void timeout_handler (int signal)
/* handle server-timeout SIGALRM signal */
{
longjmp(restart, 1);
}
#define XMIT_ACCEPT 1
#define XMIT_REJECT 2
#define XMIT_ANTISPAM 3
static int accept_count, reject_count;
#define MX_RETRIES 3
static int is_host_alias(const char *name, struct query *ctl)
/* determine whether name is a DNS alias of the hostname */
{
struct hostent *he;
struct mxentry *mxp, *mxrecords;
struct hostdata *lead_server =
ctl->server.lead_server ? ctl->server.lead_server : &ctl->server;
/*
* The first two checks are optimizations that will catch a good
* many cases.
*
* (1) check against the `true name' deduced from the poll label
* and the via option (if present) at the beginning of the poll cycle.
* Odds are good this will either be the mailserver's FQDN or a suffix of
* it with the mailserver's domain's default host name omitted.
*
* (2) Then check the rest of the `also known as'
* cache accumulated by previous DNS checks. This cache is primed
* by the aka list option.
*
* Any of these on a mail address is definitive. Only if the
* name doesn't match any is it time to call the bind library.
* If this happens odds are good we're looking at an MX name.
*/
if (strcasecmp(lead_server->truename, name) == 0)
return(TRUE);
else if (str_in_list(&lead_server->akalist, name))
return(TRUE);
else if (!ctl->server.dns)
return(FALSE);
#ifndef HAVE_RES_SEARCH
return(FALSE);
#else
/*
* The only code that calls the BIND library is here and in the
* start-of-query probe with gethostbyname(3).
*
* We know DNS service was up at the beginning of this poll cycle.
* If it's down, our nameserver has crashed. We don't want to try
* delivering the current message or anything else from this
* mailbox until it's back up.
*/
else if ((he = gethostbyname(name)) != (struct hostent *)NULL)
{
if (strcasecmp(ctl->server.truename, he->h_name) == 0)
goto match;
else
return(FALSE);
}
else
switch (h_errno)
{
case HOST_NOT_FOUND: /* specified host is unknown */
case NO_ADDRESS: /* valid, but does not have an IP address */
break;
case NO_RECOVERY: /* non-recoverable name server error */
case TRY_AGAIN: /* temporary error on authoritative server */
default:
if (outlevel != O_SILENT)
putchar('\n'); /* terminate the progress message */
error(0, 0,
"nameserver failure while looking for `%s' during poll of %s.",
name, ctl->server.pollname);
ctl->errcount++;
break;
}
/*
* We're only here if DNS was OK but the gethostbyname() failed
* with a HOST_NOT_FOUND or NO_ADDRESS error.
* Search for a name match on MX records pointing to the server.
*/
h_errno = 0;
if ((mxrecords = getmxrecords(name)) == (struct mxentry *)NULL)
{
switch (h_errno)
{
case HOST_NOT_FOUND: /* specified host is unknown */
case NO_ADDRESS: /* valid, but does not have an IP address */
return(FALSE);
break;
case NO_RECOVERY: /* non-recoverable name server error */
case TRY_AGAIN: /* temporary error on authoritative server */
default:
error(0, -1,
"nameserver failure while looking for `%s' during poll of %s.",
name, ctl->server.pollname);
ctl->errcount++;
break;
}
}
else
{
for (mxp = mxrecords; mxp->name; mxp++)
if (strcasecmp(ctl->server.truename, mxp->name) == 0)
goto match;
return(FALSE);
match:;
}
/* add this name to relevant server's `also known as' list */
save_str(&lead_server->akalist, -1, name);
return(TRUE);
#endif /* HAVE_RES_SEARCH */
}
static void map_name(name, ctl, xmit_names)
/* add given name to xmit_names if it matches declared localnames */
const char *name; /* name to map */
struct query *ctl; /* list of permissible aliases */
struct idlist **xmit_names; /* list of recipient names parsed out */
{
const char *lname;
int sl;
int off = 0;
lname = idpair_find(&ctl->localnames, name);
if (!lname && ctl->wildcard)
lname = name;
if (lname != (char *)NULL)
{
/*
* If the name of the user begins with a
* qmail virtual domain prefix, remove
* the prefix
*/
if (ctl->server.qvirtual)
{
sl=strlen(ctl->server.qvirtual);
if (!strncasecmp(lname,ctl->server.qvirtual,sl)) off=sl;
}
if (outlevel == O_VERBOSE)
error(0, 0, "mapped %s to local %s", name, lname+off);
save_str(xmit_names, XMIT_ACCEPT, lname+off);
accept_count++;
}
}
void find_server_names(hdr, ctl, xmit_names)
/* parse names out of a RFC822 header into an ID list */
const char *hdr; /* RFC822 header in question */
struct query *ctl; /* list of permissible aliases */
struct idlist **xmit_names; /* list of recipient names parsed out */
{
if (hdr == (char *)NULL)
return;
else
{
char *cp;
for (cp = nxtaddr(hdr);
cp != NULL;
cp = nxtaddr(NULL))
{
char *atsign;
if ((atsign = strchr(cp, '@'))) {
struct idlist *idp;
/*
* Does a trailing segment of the hostname match something
* on the localdomains list? If so, save the whole name
* and keep going.
*/
for (idp = ctl->server.localdomains; idp; idp = idp->next) {
char *rhs;
rhs = atsign + (strlen(atsign) - strlen(idp->id));
if (rhs > atsign &&
(rhs[-1] == '.' || rhs[-1] == '@') &&
strcasecmp(rhs, idp->id) == 0)
{
if (outlevel == O_VERBOSE)
error(0, 0, "passed through %s matching %s",
cp, idp->id);
save_str(xmit_names, XMIT_ACCEPT, cp);
accept_count++;
break;
}
}
/* if we matched a local domain, idp != NULL */
if (idp) continue;
/*
* Check to see if the right-hand part is an alias
* or MX equivalent of the mailserver. If it's
* not, skip this name. If it is, we'll keep
* going and try to find a mapping to a client name.
*/
if (!is_host_alias(atsign+1, ctl))
{
save_str(xmit_names, XMIT_REJECT, cp);
reject_count++;
continue;
}
atsign[0] = '\0';
}
map_name(cp, ctl, xmit_names);
}
}
}
static char *parse_received(struct query *ctl, char *bufp)
/* try to extract real address from the Received line */
/* If a valid Received: line is found, we return the full address in
* a buffer wich can be parsed from nxtaddr(). This is to ansure that
* the local domain part of the address can be passed along in
* find_server_names() if it contains one.
* Note: We should return a dummy header containing the address
* which makes nxtaddr() behave correctly.
*/
{
char *ok = (char *)NULL;
static char rbuf[HOSTLEN + USERNAMELEN + 4];
/*
* Try to extract the real envelope addressee. We look here
* specifically for the mailserver's Received line.
* Note: this will only work for sendmail, or an MTA that
* shares sendmail's convention for embedding the envelope
* address in the Received line. Sendmail itself only
* does this when the mail has a single recipient.
*/
if ((ok = strstr(bufp, "by ")) && isspace(ok[-1]))
{
char *sp, *tp;
/* extract space-delimited token after "by " */
for (sp = ok + 3; isspace(*sp); sp++)
continue;
tp = rbuf;
for (; !isspace(*sp); sp++)
*tp++ = *sp;
*tp = '\0';
/*
* If it's a DNS name of the mail server, look for the
* recipient name after a following "for". Otherwise
* punt.
*/
if (is_host_alias(rbuf, ctl) &&
(ok = strstr(sp, "for ")) &&
isspace(ok[-1]))
{
tp = rbuf;
sp = ok + 4;
*tp++ = ':'; /* Here is the hack. This is to be friend */
*tp++ = ' '; /* with nxtaddr()... */
if (*sp == '<')
sp++;
while (*sp == '@') /* skip routes */
while (*sp && *sp++ != ':')
continue;
while (*sp && *sp != '>' && *sp != ';')
if (!isspace(*sp))
*tp++ = *sp++;
else
{
/* uh oh -- whitespace here can't be right! */
ok = (char *)NULL;
break;
}
*tp++ = '\n';
*tp = '\0';
if (strlen(rbuf) <= 3) /* apparently nothing has been found */
ok = NULL;
} else
ok = (char *)NULL;
}
if (!ok)
return(NULL);
else
{
if (outlevel == O_VERBOSE) {
char *lf = rbuf + strlen(rbuf)-1;
*lf = '\0';
error(0, 0, "found Received address `%s'", rbuf+2);
*lf = '\n';
}
return(rbuf);
}
}
static int smtp_open(struct query *ctl)
/* try to open a socket to the appropriate SMTP server for this query */
{
/* maybe it's time to close the socket in order to force delivery */
if (NUM_NONZERO(ctl->batchlimit) && (ctl->smtp_socket != -1) && batchcount++ == ctl->batchlimit)
{
close(ctl->smtp_socket);
ctl->smtp_socket = -1;
batchcount = 0;
}
/* if no socket to any SMTP host is already set up, try to open one */
if (ctl->smtp_socket == -1)
{
/*
* RFC 1123 requires that the domain name in HELO address is a
* "valid principal domain name" for the client host. If we're
* running in invisible mode, violate this with malice
* aforethought in order to make the Received headers and
* logging look right.
*
* In fact this code relies on the RFC1123 requirement that the
* SMTP listener must accept messages even if verification of the
* HELO name fails (RFC1123 section 5.2.5, paragraph 2).
*
* How we compute the true mailhost name to pass to the
* listener doesn't affect behavior on RFC1123- violating
* listener that check for name match; we're going to lose
* on those anyway because we can never give them a name
* that matches the local machine fetchmail is running on.
* What it will affect is the listener's logging.
*/
struct idlist *idp;
char *id_me = use_invisible ? ctl->server.truename : fetchmailhost;
errno = 0;
/*
* Run down the SMTP hunt list looking for a server that's up.
* Use both explicit hunt entries (value TRUE) and implicit
* (default) ones (value FALSE).
*/
for (idp = ctl->smtphunt; idp; idp = idp->next)
{
ctl->smtphost = idp->id; /* remember last host tried. */
if ((ctl->smtp_socket = SockOpen(idp->id,SMTP_PORT)) == -1)
continue;
if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
SMTP_ehlo(ctl->smtp_socket, id_me,
&ctl->server.esmtp_options) == SM_OK)
break; /* success */
/*
* RFC 1869 warns that some listeners hang up on a failed EHLO,
* so it's safest not to assume the socket will still be good.
*/
close(ctl->smtp_socket);
ctl->smtp_socket = -1;
/* if opening for ESMTP failed, try SMTP */
if ((ctl->smtp_socket = SockOpen(idp->id,SMTP_PORT)) == -1)
continue;
if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
SMTP_helo(ctl->smtp_socket, id_me) == SM_OK)
break; /* success */
close(ctl->smtp_socket);
ctl->smtp_socket = -1;
}
}
if (outlevel >= O_VERBOSE && ctl->smtp_socket != -1)
error(0, 0, "forwarding to SMTP port on %s", ctl->smtphost);
return(ctl->smtp_socket);
}
/* these are shared by stuffline, readheaders and readbody */
static FILE *sinkfp;
static RETSIGTYPE (*sigchld)();
static int sizeticker;
static int stuffline(struct query *ctl, char *buf)
/* ship a line to the given control block's output sink (SMTP server or MDA) */
{
int n, oldphase;
char *last;
/* The line may contain NUL characters. Find the last char to use
* -- the real line termination is the sequence "\n\0".
*/
last = buf;
while ((last += strlen(last)) && (last[-1] != '\n'))
last++;
/* fix message lines that have only \n termination (for qmail) */
if (ctl->forcecr)
{
if (last - 1 == buf || last[-2] != '\r')
{
last[-1] = '\r';
*last++ = '\n';
*last = '\0';
}
}
oldphase = phase;
phase = FORWARDING_WAIT;
/*
* SMTP byte-stuffing. We only do this if the protocol does *not*
* use .<CR><LF> as EOM. If it does, the server will already have
* decorated any . lines it sends back up.
*/
if (*buf == '.')
if (protocol->delimited) /* server has already byte-stuffed */
{
if (ctl->mda)
++buf;
else
/* writing to SMTP, leave the byte-stuffing in place */;
}
else /* if (!protocol->delimited) -- not byte-stuffed already */
{
if (!ctl->mda)
SockWrite(ctl->smtp_socket, buf, 1); /* byte-stuff it */
else
/* leave it alone */;
}
/* we may need to strip carriage returns */
if (ctl->stripcr)
{
char *sp, *tp;
for (sp = tp = buf; sp < last; sp++)
if (*sp != '\r')
*tp++ = *sp;
*tp = '\0';
last = tp;
}
n = 0;
if (ctl->mda)
n = fwrite(buf, 1, last - buf, sinkfp);
else if (ctl->smtp_socket != -1)
n = SockWrite(ctl->smtp_socket, buf, last - buf);
phase = oldphase;
return(n);
}
static int readheaders(sock, fetchlen, reallen, ctl, num)
/* read message headers and ship to SMTP or MDA */
int sock; /* to which the server is connected */
long fetchlen; /* length of message according to fetch response */
long reallen; /* length of message according to getsizes */
struct query *ctl; /* query control record */
int num; /* index of message */
{
struct addrblk
{
int offset;
struct addrblk *next;
};
struct addrblk *to_addrchain = NULL;
struct addrblk **to_chainptr = &to_addrchain;
struct addrblk *resent_to_addrchain = NULL;
struct addrblk **resent_to_chainptr = &resent_to_addrchain;
char buf[MSGBUFSIZE+1];
char return_path[HOSTLEN + USERNAMELEN + 4];
int from_offs, reply_to_offs, resent_from_offs;
int app_from_offs, sender_offs, resent_sender_offs;
int ctt_offs, env_offs;
char *headers, *received_for, *destaddr, *rcv, *cp;
int n, linelen, oldlen, ch, remaining, skipcount;
struct idlist *idp, *xmit_names;
flag good_addresses, bad_addresses, has_nuls;
flag no_local_matches = FALSE;
int olderrs;
sizeticker = 0;
has_nuls = FALSE;
return_path[0] = '\0';
olderrs = ctl->errcount;
/* read message headers */
headers = received_for = NULL;
from_offs = reply_to_offs = resent_from_offs = app_from_offs =
sender_offs = resent_sender_offs = ctt_offs = env_offs = -1;
oldlen = 0;
msglen = 0;
skipcount = 0;
for (remaining = fetchlen; remaining > 0 || protocol->delimited; remaining -= linelen)
{
char *line;
line = xmalloc(sizeof(buf));
linelen = 0;
line[0] = '\0';
do {
if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) {
free(line);
free(headers);
return(PS_SOCKET);
}
linelen += n;
msglen += n;
/* lines may not be properly CRLF terminated; fix this for qmail */
if (ctl->forcecr)
{
cp = buf + strlen(buf) - 1;
if (*cp == '\n' && (cp == buf || cp[-1] != '\r'))
{
*cp++ = '\r';
*cp++ = '\n';
*cp++ = '\0';
}
}
set_timeout(ctl->server.timeout);
line = (char *) realloc(line, strlen(line) + strlen(buf) +1);
strcat(line, buf);
if (line[0] == '\r' && line[1] == '\n')
break;
} while
/* we may need to grab RFC822 continuations */
((ch = SockPeek(sock)) == ' ' || ch == '\t');
/* write the message size dots */
if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0)
{
sizeticker += linelen;
while (sizeticker >= SIZETICKER)
{
error_build(".");
sizeticker -= SIZETICKER;
}
}
if (linelen != strlen(line))
has_nuls = TRUE;
/* check for end of headers; don't save terminating line */
if (line[0] == '\r' && line[1] == '\n')
{
free(line);
break;
}
/*
* The University of Washington IMAP server (the reference
* implementation of IMAP4 written by Mark Crispin) relies
* on being able to keep base-UID information in a special
* message at the head of the mailbox. This message should
* neither be deleted nor forwarded.
*/
#ifdef POP2_ENABLE
/*
* We disable this check under POP2 because there's no way to
* prevent deletion of the message. So at least we ought to
* forward it to the user so he or she will have some clue
* that things have gone awry.
*/
if (protocol->port != 109)
#endif /* POP2_ENABLE */
if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) {
free(line);
free(headers);
return(PS_RETAINED);
}
/*
* This code prevents fetchmail from becoming an accessory after
* the fact to upstream sendmails with the `E' option on. This
* can result in an escaped Unix From_ line at the beginning of
* the headers. If fetchmail just passes it through, the client
* listener may think the message has *no* headers (since the first)
* line it sees doesn't look RFC822-conformant) and fake up a set.
*
* What the user would see in this case is bogus (synthesized)
* headers, followed by a blank line, followed by the >From,
* followed by the real headers, followed by a blank line,
* followed by text.
*
* We forestall this lossage by tossing anything that looks
* like an escaped From_ line in headers. These aren't RFC822
* so our conscience is clear...
*/
if (!strncasecmp(line, ">From ", 6))
{
free(line);
continue;
}
/*
* If we see a Status line, it may have been inserted by an MUA
* on the mail host, or it may have been inserted by the server
* program after the headers in the transaction stream. This
* can actually hose some new-mail notifiers such as xbuffy,
* which assumes any Status line came from a *local* MDA and
* therefore indicates that the message has been seen.
*
* Some buggy POP servers (including at least the 3.3(20)
* version of the one distributed with IMAP) insert empty
* Status lines in the transaction stream; we'll chuck those
* unconditionally. Nonempty ones get chucked if the user
* turns on the dropstatus flag.
*/
if (!strncasecmp(line, "Status:", 7)
|| !strncasecmp(line, "X-Mozilla-Status:", 7))
{
char *cp;
for (cp = line + 7; *cp && isspace(*cp); cp++)
continue;
if (!*cp || ctl->dropstatus)
{
free(line);
continue;
}
}
if (ctl->rewrite)
line = reply_hack(line, ctl->server.truename);
/*
* OK, this is messy. If we're forwarding by SMTP, it's the
* SMTP-receiver's job (according to RFC821, page 22, section
* 4.1.1) to generate a Return-Path line on final delivery.
* The trouble is, we've already got one because the
* mailserver's SMTP thought *it* was responsible for final
* delivery.
*
* Stash away the contents of Return-Path for use in generating
* MAIL FROM later on, then prevent the header from being saved
* with the others. In effect, we strip it off here.
*
* If the SMTP server conforms to the standards, and fetchmail gets the
* envelope sender from the Return-Path, the new Return-Path should be
* exactly the same as the original one.
*/
if (!strncasecmp("Return-Path:", line, 12))
{
strcpy(return_path, nxtaddr(line));
if (!ctl->mda) {
free(line);
continue;
}
}
if (!headers)
{
oldlen = strlen(line);
headers = xmalloc(oldlen + 1);
(void) strcpy(headers, line);
free(line);
line = headers;
}
else
{
int newlen;
newlen = oldlen + strlen(line);
headers = (char *) realloc(headers, newlen + 1);
if (headers == NULL) {
free(line);
return(PS_IOERR);
}
strcpy(headers + oldlen, line);
free(line);
line = headers + oldlen;
oldlen = newlen;
}
if (!strncasecmp("From:", line, 5))
from_offs = (line - headers);
else if (!strncasecmp("Reply-To:", line, 9))
reply_to_offs = (line - headers);
else if (!strncasecmp("Resent-From:", line, 12))
resent_from_offs = (line - headers);
else if (!strncasecmp("Apparently-From:", line, 16))
app_from_offs = (line - headers);
else if (!strncasecmp("Sender:", line, 7))
sender_offs = (line - headers);
else if (!strncasecmp("Resent_Sender:", line, 14))
resent_sender_offs = (line - headers);
else if (!strncasecmp("Content-Transfer-Encoding:", line, 26))
ctt_offs = (line - headers);
else if (!strncasecmp("Message-Id:", buf, 11 ))
{
if( ctl->server.uidl )
{
char id[IDLEN+1];
/* prevent stack overflows */
buf[IDLEN+12] = 0;
sscanf( buf+12, "%s", id);
if( !str_find( &ctl->newsaved, num ) )
save_str(&ctl->newsaved, num, id );
}
}
else if (!MULTIDROP(ctl))
continue;
else if (!strncasecmp("To:", line, 3)
|| !strncasecmp("Cc:", line, 3)
|| !strncasecmp("Bcc:", line, 4)
|| !strncasecmp("Apparently-To:", line, 14))
{
*to_chainptr = xmalloc(sizeof(struct addrblk));
(*to_chainptr)->offset = (line - headers);
to_chainptr = &(*to_chainptr)->next;
*to_chainptr = NULL;
}
else if (!strncasecmp("Resent-To:", line, 10)
|| !strncasecmp("Resent-Cc:", line, 10)
|| !strncasecmp("Resent-Bcc:", line, 11))
{
*resent_to_chainptr = xmalloc(sizeof(struct addrblk));
(*resent_to_chainptr)->offset = (line - headers);
resent_to_chainptr = &(*resent_to_chainptr)->next;
*resent_to_chainptr = NULL;
}
else if (ctl->server.envelope != STRING_DISABLED)
{
if (ctl->server.envelope
&& strcasecmp(ctl->server.envelope, "Received"))
{
if (env_offs == -1 && !strncasecmp(ctl->server.envelope,
line,
strlen(ctl->server.envelope)))
{
if (skipcount++ != ctl->server.envskip)
continue;
env_offs = (line - headers);
}
}
else if (!received_for && !strncasecmp("Received:", line, 9))
{
if (skipcount++ != ctl->server.envskip)
continue;
received_for = parse_received(ctl, line);
}
}
}
/*
* Hack time. If the first line of the message was blank, with no headers
* (this happens occasionally due to bad gatewaying software) cons up
* a set of fake headers.
*
* If you modify the fake header template below, be sure you don't
* make either From or To address @-less, otherwise the reply_hack
* logic will do bad things.
*/
if (headers == (char *)NULL)
{
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
#else
sprintf(buf,
#endif /* HAVE_SNPRINTF */
"From: <FETCHMAIL-DAEMON@%s>\r\nTo: %s@localhost\r\nSubject: Headerless mail from %s's mailbox on %s\r\n",
fetchmailhost, user, ctl->remotename, ctl->server.truename);
headers = xstrdup(buf);
}
/*
* We can now process message headers before reading the text.
* In fact we have to, as this will tell us where to forward to.
*/
/*
* If there is a Return-Path address on the message, this was
* almost certainly the MAIL FROM address given the originating
* sendmail. This is the best thing to use for logging the
* message origin (it sets up the right behavior for bounces and
* mailing lists). Otherwise, fall down to the next available
* envelope address wich is the most probable real sender
* respectively. *** The order is important! ***
* This is especially useful when receiving mailing list
* messages in multidrop mode. if a local address doesn't
* exist, the bounce message won't be returned blindly to the
* author or to the list itself but rather to the list manager
* (ex: specified by "Sender:") wich is less anoying. This is
* true for most mailing list packages.
*/
if( !return_path[0] ){
char *ap = NULL;
if (resent_sender_offs >= 0 && (ap = nxtaddr(headers + resent_sender_offs)));
else if (sender_offs >= 0 && (ap = nxtaddr(headers + sender_offs)));
else if (resent_from_offs >= 0 && (ap = nxtaddr(headers + resent_from_offs)));
else if (from_offs >= 0 && (ap = nxtaddr(headers + from_offs)));
else if (reply_to_offs >= 0 && (ap = nxtaddr(headers + reply_to_offs)));
else if (app_from_offs >= 0 && (ap = nxtaddr(headers + app_from_offs)));
if (ap) strcpy( return_path, ap );
}
/* cons up a list of local recipients */
xmit_names = (struct idlist *)NULL;
bad_addresses = good_addresses = accept_count = reject_count = 0;
/* is this a multidrop box? */
if (MULTIDROP(ctl))
{
if (env_offs > -1) /* We have the actual envelope addressee */
find_server_names(headers + env_offs, ctl, &xmit_names);
else if (received_for)
/*
* We have the Received for addressee.
* It has to be a mailserver address, or we
* wouldn't have got here.
* We use find_server_names() to let local
* hostnames go through.
*/
find_server_names(received_for, ctl, &xmit_names);
else {
/*
* We haven't extracted the envelope address.
* So check all the "Resent-To" header addresses if
* they exist. If and only if they don't, consider
* the "To" adresses.
*/
register struct addrblk *nextptr;
if (resent_to_addrchain) {
/* delete the "To" chain and substitute it
* with the "Resent-To" list
*/
while (to_addrchain) {
nextptr = to_addrchain->next;
free(to_addrchain);
to_addrchain = nextptr;
}
to_addrchain = resent_to_addrchain;
resent_to_addrchain = NULL;
}
/* now look for remaining adresses */
while (to_addrchain) {
find_server_names(headers+to_addrchain->offset, ctl, &xmit_names);
nextptr = to_addrchain->next;
free(to_addrchain);
to_addrchain = nextptr;
}
}
if (!accept_count)
{
no_local_matches = TRUE;
save_str(&xmit_names, XMIT_ACCEPT, user);
if (outlevel == O_VERBOSE)
error(0, 0,
"no local matches, forwarding to %s",
user);
}
}
else /* it's a single-drop box, use first localname */
save_str(&xmit_names, XMIT_ACCEPT, ctl->localnames->id);
/*
* Time to either address the message or decide we can't deliver it yet.
*/
if (ctl->errcount > olderrs) /* there were DNS errors above */
{
if (outlevel == O_VERBOSE)
error(0,0, "forwarding and deletion suppressed due to DNS errors");
free(headers);
free_str_list(&xmit_names);
return(PS_TRANSIENT);
}
else if (ctl->mda) /* we have a declared MDA */
{
int length = 0;
char *names, *before, *after;
for (idp = xmit_names; idp; idp = idp->next)
if (idp->val.num == XMIT_ACCEPT)
good_addresses++;
destaddr = "localhost";
length = strlen(ctl->mda) + 1;
before = xstrdup(ctl->mda);
/* sub user addresses for %T (or %s for backward compatibility) */
cp = (char *)NULL;
if (strstr(before, "%s") || (cp = strstr(before, "%T")))
{
char *sp;
if (cp && cp[1] == 'T')
cp[1] = 's';
/* \177 had better be out-of-band for MDA commands */
for (sp = before; *sp; sp++)
if (*sp == '%' && sp[1] != 's' && sp[1] != 'T')
*sp = '\177';
/*
* We go through this in order to be able to handle very
* long lists of users and (re)implement %s.
*/
for (idp = xmit_names; idp; idp = idp->next)
if (idp->val.num == XMIT_ACCEPT)
length += (strlen(idp->id) + 1);
names = (char *)xmalloc(++length);
names[0] = '\0';
for (idp = xmit_names; idp; idp = idp->next)
if (idp->val.num == XMIT_ACCEPT)
{
strcat(names, idp->id);
strcat(names, " ");
}
after = (char *)xmalloc(length);
#ifdef SNPRINTF
snprintf(after, length, before, names);
#else
sprintf(after, before, names);
#endif /* SNPRINTF */
free(names);
free(before);
before = after;
for (sp = before; *sp; sp++)
if (*sp == '\177')
*sp = '%';
}
/* substitute From address for %F */
if ((cp = strstr(before, "%F")))
{
char *from = return_path;
char *sp;
/* \177 had better be out-of-band for MDA commands */
for (sp = before; *sp; sp++)
if (*sp == '%' && sp[1] != 'F')
*sp = '\177';
length += strlen(from);
after = (char *)xmalloc(length);
cp[1] = 's';
#ifdef SNPRINTF
snprintf(after, length, before, from);
#else
sprintf(after, before, from);
#endif /* SNPRINTF */
free(before);
before = after;
for (sp = before; *sp; sp++)
if (*sp == '\177')
*sp = '%';
}
if (outlevel == O_VERBOSE)
error(0, 0, "about to deliver with: %s", before);
#ifdef HAVE_SETEUID
/*
* Arrange to run with user's permissions if we're root.
* This will initialize the ownership of any files the
* MDA creates properly. (The seteuid call is available
* under all BSDs and Linux)
*/
seteuid(ctl->uid);
#endif /* HAVE_SETEUID */
sinkfp = popen(before, "w");
free(before);
#ifdef HAVE_SETEUID
/* this will fail quietly if we didn't start as root */
seteuid(0);
#endif /* HAVE_SETEUID */
if (!sinkfp)
{
error(0, 0, "MDA open failed");
free(headers);
free_str_list(&xmit_names);
return(PS_IOERR);
}
sigchld = signal(SIGCHLD, SIG_DFL);
}
else
{
char *ap, *ctt, options[MSGBUFSIZE], addr[128];
/* build a connection to the SMTP listener */
if ((smtp_open(ctl) == -1))
{
error(0, errno, "SMTP connect to %s failed",
ctl->smtphost ? ctl->smtphost : "localhost");
free(headers);
free_str_list(&xmit_names);
return(PS_SMTP);
}
/*
* Compute ESMTP options. It's a kluge to use nxtaddr()
* here because the contents of the Content-Transfer-Encoding
* headers isn't semantically an address. But it has the
* desired tokenizing effect.
*/
options[0] = '\0';
if (ctl->server.esmtp_options & ESMTP_8BITMIME)
if (ctl->pass8bits)
strcpy(options, " BODY=8BITMIME");
else if ((ctt_offs >= 0) && (ctt = nxtaddr(headers + ctt_offs)))
{
if (!strcasecmp(ctt,"7BIT"))
strcpy(options, " BODY=7BIT");
else if (!strcasecmp(ctt,"8BIT"))
strcpy(options, " BODY=8BITMIME");
}
if ((ctl->server.esmtp_options & ESMTP_SIZE) && reallen > 0)
sprintf(options + strlen(options), " SIZE=%ld", reallen);
/*
* Try to get the SMTP listener to take the Return-Path
* address as MAIL FROM . If it won't, fall back on the
* calling-user ID. This won't affect replies, which use the
* header From address anyway.
*
* RFC 1123 requires that the domain name part of the
* MAIL FROM address be "canonicalized", that is a
* FQDN or MX but not a CNAME. We'll assume the From
* header is already in this form here (it certainly
* is if rewrite is on). RFC 1123 is silent on whether
* a nonexistent hostname part is considered canonical.
*
* This is a potential problem if the MTAs further upstream
* didn't pass canonicalized From/Return-Path lines, *and* the
* local SMTP listener insists on them.
*/
ap = (return_path[0]) ? return_path : user;
if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
{
int smtperr = atoi(smtp_response);
/*
* Suppress error message only if the response specifically
* means `excluded for policy reasons'. We *should* see
* an error when the return code is less specific.
*/
if (smtperr >= 400 && smtperr != 571)
error(0, -1, "SMTP error: %s", smtp_response);
switch (smtperr)
{
case 571: /* sendmail's "unsolicited email refused" */
case 501: /* exim's old antispam response */
case 550: /* exim's new antispam response (temporary) */
/*
* SMTP listener explicitly refuses to deliver
* mail coming from this address, probably due
* to an anti-spam domain exclusion. Respect
* this. Don't try to ship the message, and
* don't prevent it from being deleted.
*/
free(headers);
free_str_list(&xmit_names);
return(PS_REFUSED);
case 452: /* insufficient system storage */
/*
* Temporary out-of-queue-space condition on the
* ESMTP server. Don't try to ship the message,
* and suppress deletion so it can be retried on
* a future retrieval cycle.
*/
SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
free(headers);
free_str_list(&xmit_names);
return(PS_TRANSIENT);
case 552: /* message exceeds fixed maximum message size */
/*
* Permanent no-go condition on the
* ESMTP server. Don't try to ship the message,
* and allow it to be deleted.
*/
SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
free(headers);
free_str_list(&xmit_names);
return(PS_REFUSED);
default: /* retry with invoking user's address */
if (SMTP_from(ctl->smtp_socket, user, options) != SM_OK)
{
error(0, -1, "SMTP error: %s", smtp_response);
free(headers);
free_str_list(&xmit_names);
return(PS_SMTP); /* should never happen */
}
}
}
/*
* Now list the recipient addressees
*
* RFC 1123 requires that the domain name part of the
* RCPT TO address be "canonicalized", that is a FQDN
* or MX but not a CNAME. Some listeners (like exim)
* enforce this.
*/
destaddr = ctl->smtpaddress ? ctl->smtpaddress : ( ctl->smtphost ? ctl->smtphost : "localhost");
for (idp = xmit_names; idp; idp = idp->next)
if (idp->val.num == XMIT_ACCEPT)
{
if (strchr(idp->id, '@'))
strcpy(addr, idp->id);
else
#ifdef HAVE_SNPRINTF
snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, destaddr);
#else
sprintf(addr, "%s@%s", idp->id, destaddr);
#endif /* HAVE_SNPRINTF */
if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
good_addresses++;
else
{
bad_addresses++;
idp->val.num = XMIT_ANTISPAM;
error(0, 0,
"SMTP listener doesn't like recipient address `%s@%s'", idp->id, destaddr);
}
}
if (!good_addresses)
{
#ifdef HAVE_SNPRINTF
snprintf(addr, sizeof(addr)-1, "%s@%s", user, destaddr);
#else
sprintf(addr, "%s@%s", user, destaddr);
#endif /* HAVE_SNPRINTF */
if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
{
error(0, 0, "can't even send to calling user!");
free(headers);
free_str_list(&xmit_names);
return(PS_SMTP);
}
}
/* tell it we're ready to send data */
SMTP_data(ctl->smtp_socket);
}
n = 0;
/*
* Some server/sendmail combinations cause problems when our
* synthetic Received line is before the From header. Cope
* with this...
*/
if ((rcv = strstr(headers, "Received:")) == (char *)NULL)
rcv = headers;
if (rcv > headers)
{
*rcv = '\0';
n = stuffline(ctl, headers);
*rcv = 'R';
}
if (!use_invisible && n != -1)
{
/* utter any per-message Received information we need here */
sprintf(buf, "Received: from %s\n", ctl->server.truename);
n = stuffline(ctl, buf);
if (n != -1)
{
/*
* We used to include ctl->remotename in this log line,
* but this can be secure information that would be bad
* to reveal.
*/
sprintf(buf, "\tby %s (fetchmail-%s %s)\n",
fetchmailhost,
RELEASE_ID,
protocol->name);
n = stuffline(ctl, buf);
if (n != -1)
{
time_t now;
buf[0] = '\t';
if (good_addresses == 0)
{
sprintf(buf+1,
"for <%s@%s> (by default); ",
user, destaddr);
}
else if (good_addresses == 1)
{
for (idp = xmit_names; idp; idp = idp->next)
if (idp->val.num == XMIT_ACCEPT)
break; /* only report first address */
sprintf(buf+1, "for <%s@%s> (%s); ",
idp->id, destaddr,
MULTIDROP(ctl) ? "multi-drop" : "single-drop");
}
else
buf[1] = '\0';
time(&now);
#ifdef HAVE_STRFTIME
/*
* Conform to RFC822. This is typically going to emit
* a three-letter timezone for %Z, which is going to
* be marked "obsolete syntax" in 822bis. Note that we
* generate a 4-digit year here.
*/
strftime(buf + strlen(buf), sizeof(buf) - strlen(buf),
"%a, %d %b %Y %H:%M:%S %Z\n", localtime(&now));
#else
/*
* This is really just a portability fallback, as the
* date format ctime(3) emits is not RFC822
* conformant.
*/
strcat(buf, ctime(&now));
#endif /* HAVE_STRFTIME */
n = stuffline(ctl, buf);
}
}
}
if (n != -1)
n = stuffline(ctl, rcv); /* ship out rest of headers */
if (n == -1)
{
error(0, errno, "writing RFC822 headers");
if (ctl->mda)
{
if (sinkfp)
pclose(sinkfp);
signal(SIGCHLD, sigchld);
}
free(headers);
free_str_list(&xmit_names);
return(PS_IOERR);
}
else if (outlevel == O_VERBOSE)
fputs("#", stderr);
/* write error notifications */
if (no_local_matches || has_nuls || bad_addresses)
{
int errlen = 0;
char errhd[USERNAMELEN + POPBUFSIZE], *errmsg;
errmsg = errhd;
(void) strcpy(errhd, "X-Fetchmail-Warning: ");
if (no_local_matches)
{
if (reject_count != 1)
strcat(errhd, "no recipient addresses matched declared local names");
else
{
for (idp = xmit_names; idp; idp = idp->next)
if (idp->val.num == XMIT_REJECT)
break;
sprintf(errhd+strlen(errhd), "recipient address %s didn't match any local name", idp->id);
}
}
if (has_nuls)
{
if (errhd[sizeof("X-Fetchmail-Warning: ")])
strcat(errhd, "; ");
strcat(errhd, "message has embedded NULs");
}
if (bad_addresses)
{
if (errhd[sizeof("X-Fetchmail-Warning: ")])
strcat(errhd, "; ");
strcat(errhd, "SMTP listener rejected local recipient addresses: ");
errlen = strlen(errhd);
for (idp = xmit_names; idp; idp = idp->next)
if (idp->val.num == XMIT_ANTISPAM)
errlen += strlen(idp->id) + 2;
errmsg = alloca(errlen+3);
(void) strcpy(errmsg, errhd);
for (idp = xmit_names; idp; idp = idp->next)
if (idp->val.num == XMIT_ANTISPAM)
{
strcat(errmsg, idp->id);
if (idp->next)
strcat(errmsg, ", ");
}
}
strcat(errmsg, "\n");
/* ship out the error line */
if (sinkfp)
stuffline(ctl, errmsg);
}
/* issue the delimiter line */
cp = buf;
*cp++ = '\r';
*cp++ = '\n';
*cp++ = '\0';
stuffline(ctl, buf);
free(headers);
free_str_list(&xmit_names);
return(PS_SUCCESS);
}
static int readbody(sock, ctl, forward, len)
/* read and dispose of a message body presented on sock */
struct query *ctl; /* query control record */
int sock; /* to which the server is connected */
int len; /* length of message */
flag forward; /* TRUE to forward */
{
int linelen;
char buf[MSGBUFSIZE+1];
/* pass through the text lines */
while (protocol->delimited || len > 0)
{
if ((linelen = SockRead(sock, buf, sizeof(buf)-1)) == -1)
{
if (ctl->mda)
{
if (sinkfp)
pclose(sinkfp);
signal(SIGCHLD, sigchld);
}
return(PS_SOCKET);
}
set_timeout(ctl->server.timeout);
/* write the message size dots */
if (linelen > 0)
{
sizeticker += linelen;
while (sizeticker >= SIZETICKER)
{
if (outlevel > O_SILENT)
error_build(".");
sizeticker -= SIZETICKER;
}
}
len -= linelen;
/* check for end of message */
if (protocol->delimited && *buf == '.')
if (buf[1] == '\r' && buf[2] == '\n' && buf[3] == '\0')
break;
else if (buf[1] == '\n' && buf[2] == '\0')
break;
else
msglen--; /* subtract the size of the dot escape */
msglen += linelen;
/* ship out the text line */
if (forward)
{
int n = stuffline(ctl, buf);
if (n < 0)
{
error(0, errno, "writing message text");
if (ctl->mda)
{
if (sinkfp)
pclose(sinkfp);
signal(SIGCHLD, sigchld);
}
return(PS_IOERR);
}
else if (outlevel == O_VERBOSE)
fputc('*', stderr);
}
}
return(PS_SUCCESS);
}
#ifdef KERBEROS_V4
int
kerberos_auth (socket, canonical)
/* authenticate to the server host using Kerberos V4 */
int socket; /* socket to server host */
#ifdef __FreeBSD__
char *canonical; /* server name */
#else
const char *canonical; /* server name */
#endif
{
char * host_primary;
KTEXT ticket;
MSG_DAT msg_data;
CREDENTIALS cred;
Key_schedule schedule;
int rem;
ticket = ((KTEXT) (malloc (sizeof (KTEXT_ST))));
rem = (krb_sendauth (0L, socket, ticket, "pop",
canonical,
((char *) (krb_realmofhost (canonical))),
((unsigned long) 0),
(&msg_data),
(&cred),
(schedule),
((struct sockaddr_in *) 0),
((struct sockaddr_in *) 0),
"KPOPV0.1"));
free (ticket);
if (rem != KSUCCESS)
{
error(0, -1, "kerberos error %s", (krb_get_err_text (rem)));
return (PS_AUTHFAIL);
}
return (0);
}
#endif /* KERBEROS_V4 */
int do_protocol(ctl, proto)
/* retrieve messages from server using given protocol method table */
struct query *ctl; /* parsed options with merged-in defaults */
const struct method *proto; /* protocol method table */
{
int ok, js, sock = -1;
char *msg;
void (*sigsave)();
#ifndef KERBEROS_V4
if (ctl->server.preauthenticate == A_KERBEROS_V4)
{
error(0, -1, "Kerberos V4 support not linked.");
return(PS_ERROR);
}
#endif /* KERBEROS_V4 */
/* lacking methods, there are some options that may fail */
if (!proto->is_old)
{
/* check for unsupported options */
if (ctl->flush) {
error(0, 0,
"Option --flush is not supported with %s",
proto->name);
return(PS_SYNTAX);
}
else if (ctl->fetchall) {
error(0, 0,
"Option --all is not supported with %s",
proto->name);
return(PS_SYNTAX);
}
}
if (!proto->getsizes && NUM_SPECIFIED(ctl->limit))
{
error(0, 0,
"Option --limit is not supported with %s",
proto->name);
return(PS_SYNTAX);
}
protocol = proto;
pass = 0;
tagnum = 0;
tag[0] = '\0'; /* nuke any tag hanging out from previous query */
ok = 0;
/* set up the server-nonresponse timeout */
sigsave = signal(SIGALRM, timeout_handler);
set_timeout(mytimeout = ctl->server.timeout);
if ((js = setjmp(restart)) == 1)
{
if (phase == SERVER_WAIT)
error(0, 0,
"timeout after %d seconds waiting for server %s.",
ctl->server.timeout, ctl->server.pollname);
else if (phase == FORWARDING_WAIT)
error(0, 0,
"timeout after %d seconds waiting for %s.",
ctl->server.timeout,
ctl->mda ? "MDA" : "SMTP");
else
error(0, 0, "timeout after %d seconds.", ctl->server.timeout);
if (ctl->smtp_socket != -1)
close(ctl->smtp_socket);
if (sock != -1)
close(sock);
if (sinkfp)
pclose(sinkfp);
ok = PS_ERROR;
}
else
{
char buf [POPBUFSIZE+1], *realhost;
int *msgsizes, len, num, count, new, deletions = 0;
#if INET6
int fetches, dispatches;
#else /* INET6 */
int port, fetches, dispatches;
#endif /* INET6 */
struct idlist *idp;
/* execute pre-initialization command, if any */
if (ctl->preconnect && (ok = system(ctl->preconnect)))
{
sprintf(buf, "pre-connection command failed with status %d", ok);
error(0, 0, buf);
ok = PS_SYNTAX;
goto closeUp;
}
/* open a socket to the mail server */
#if !INET6
port = ctl->server.port ? ctl->server.port : protocol->port;
#endif /* !INET6 */
realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname;
#if INET6
if ((sock = SockOpen(realhost, ctl->server.service ? ctl->server.service : protocol->service)) == -1)
#else /* INET6 */
if ((sock = SockOpen(realhost, port)) == -1)
#endif /* INET6 */
{
#if !INET6
#ifndef EHOSTUNREACH
#define EHOSTUNREACH (-1)
#endif
if (outlevel == O_VERBOSE || errno != EHOSTUNREACH)
{
error_build("fetchmail: %s connection to %s failed: ",
protocol->name, ctl->server.pollname);
#ifdef HAVE_RES_SEARCH
if (h_errno == HOST_NOT_FOUND)
error_complete(0, 0, "host is unknown");
else if (h_errno == NO_ADDRESS)
error_complete(0, 0, "name is valid but has no IP address");
else if (h_errno == NO_RECOVERY)
error_complete(0, 0, "unrecoverable name server error");
else if (h_errno == TRY_AGAIN)
error_complete(0, 0, "temporary name server error");
else if (h_errno)
error_complete(0, 0, "unknown DNS error %d", h_errno);
else
#endif /* HAVE_RES_SEARCH */
error_complete(0, errno, "local error");
}
#endif /* INET6 */
ok = PS_SOCKET;
goto closeUp;
}
#ifdef KERBEROS_V4
if (ctl->server.preauthenticate == A_KERBEROS_V4)
{
ok = kerberos_auth(sock, ctl->server.truename);
if (ok != 0)
goto cleanUp;
set_timeout(ctl->server.timeout);
}
#endif /* KERBEROS_V4 */
/* accept greeting message from mail server */
ok = (protocol->parse_response)(sock, buf);
if (ok != 0)
goto cleanUp;
set_timeout(ctl->server.timeout);
/* try to get authorized to fetch mail */
if (protocol->getauth)
{
shroud = ctl->password;
ok = (protocol->getauth)(sock, ctl, buf);
shroud = (char *)NULL;
if (ok != 0)
{
if (ok == PS_LOCKBUSY)
error(0, -1, "Lock-busy error on %s@%s",
ctl->remotename,
ctl->server.truename);
else
{
if (ok == PS_ERROR)
ok = PS_AUTHFAIL;
error(0, -1, "Authorization failure on %s@%s",
ctl->remotename,
ctl->server.truename);
}
goto cleanUp;
}
set_timeout(ctl->server.timeout);
}
ctl->errcount = fetches = 0;
/* now iterate over each folder selected */
for (idp = ctl->mailboxes; idp; idp = idp->next)
{
pass = 0;
do {
dispatches = 0;
++pass;
if (outlevel >= O_VERBOSE)
if (idp->id)
error(0, 0, "selecting or re-polling folder %s", idp->id);
else
error(0, 0, "selecting or re-polling default folder");
/* compute # of messages and number of new messages waiting */
ok = (protocol->getrange)(sock, ctl, idp->id, &count, &new);
if (ok != 0)
goto cleanUp;
set_timeout(ctl->server.timeout);
/* show user how many messages we downloaded */
if (idp->id)
(void) sprintf(buf, "%s at %s (folder %s)",
ctl->remotename, ctl->server.truename, idp->id);
else
(void) sprintf(buf, "%s at %s", ctl->remotename, ctl->server.truename);
if (outlevel > O_SILENT)
if (count == -1) /* only used for ETRN */
error(0, 0, "Polling %s", ctl->server.truename);
else if (count != 0)
{
if (new != -1 && (count - new) > 0)
error(0, 0, "%d message%s (%d seen) for %s.",
count, count > 1 ? "s" : "", count-new, buf);
else
error(0, 0, "%d message%s for %s.",
count, count > 1 ? "s" : "", buf);
}
else
{
/* these are pointless in normal daemon mode */
if (pass == 1 && (poll_interval == 0 || outlevel == O_VERBOSE))
error(0, 0, "No mail for %s", buf);
}
/* very important, this is where we leave the do loop */
if (count == 0)
break;
if (check_only)
{
if (new == -1 || ctl->fetchall)
new = count;
ok = ((new > 0) ? PS_SUCCESS : PS_NOMAIL);
goto cleanUp;
}
else if (count > 0)
{
flag force_retrieval;
/*
* What forces this code is that in POP3 and
* IMAP2BIS you can't fetch a message without
* having it marked `seen'. In IMAP4, on the
* other hand, you can (peek_capable is set to
* convey this).
*
* The result of being unable to peek is that if there's
* any kind of transient error (DNS lookup failure, or
* sendmail refusing delivery due to process-table limits)
* the message will be marked "seen" on the server without
* having been delivered. This is not a big problem if
* fetchmail is running in foreground, because the user
* will see a "skipped" message when it next runs and get
* clued in.
*
* But in daemon mode this leads to the message
* being silently ignored forever. This is not
* acceptable.
*
* We compensate for this by checking the error
* count from the previous pass and forcing all
* messages to be considered new if it's nonzero.
*/
force_retrieval = !peek_capable && (ctl->errcount > 0);
/*
* We need the size of each message before it's
* loaded in order to pass via the ESMTP SIZE
* option. If the protocol has a getsizes method,
* we presume this means it doesn't get reliable
* sizes from message fetch responses.
*/
if (proto->getsizes)
{
int i;
msgsizes = (int *)alloca(sizeof(int) * count);
for (i = 0; i < count; i++)
msgsizes[i] = -1;
ok = (proto->getsizes)(sock, count, msgsizes);
if (ok != 0)
goto cleanUp;
set_timeout(ctl->server.timeout);
}
/* read, forward, and delete messages */
for (num = 1; num <= count; num++)
{
flag toolarge = NUM_NONZERO(ctl->limit)
&& msgsizes && (msgsizes[num-1] > ctl->limit);
flag fetch_it = !toolarge
&& (ctl->fetchall || force_retrieval || !(protocol->is_old && (protocol->is_old)(sock,ctl,num)));
flag suppress_delete = FALSE;
flag suppress_forward = FALSE;
flag retained = FALSE;
/*
* This check copes with Post Office/NT's
* annoying habit of randomly prepending bogus
* LIST items of length -1. Patrick Audley
* <paudley@pobox.com> tells us: LIST shows a
* size of -1, RETR and TOP return "-ERR
* System error - couldn't open message", and
* DELE succeeds but doesn't actually delete
* the message.
*/
if (msgsizes && msgsizes[num-1] == -1)
{
if (outlevel >= O_VERBOSE)
error(0, 0,
"Skipping message %d, length -1",
num - 1);
continue;
}
/* we may want to reject this message if it's old */
if (!fetch_it)
{
if (outlevel > O_SILENT)
{
error_build("skipping message %d", num);
if (toolarge)
error_build(" (oversized, %d bytes)",
msgsizes[num-1]);
}
}
else
{
flag wholesize = !protocol->fetch_body;
/* request a message */
ok = (protocol->fetch_headers)(sock,ctl,num, &len);
if (ok != 0)
goto cleanUp;
set_timeout(ctl->server.timeout);
/* -1 means we didn't see a size in the response */
if (len == -1 && msgsizes)
{
len = msgsizes[num - 1];
wholesize = TRUE;
}
if (outlevel > O_SILENT)
{
error_build("reading message %d of %d",
num,count);
if (len > 0)
error_build(" (%d %sbytes)",
len, wholesize ? "" : "header ");
if (outlevel == O_VERBOSE)
error_complete(0, 0, "");
else
error_build(" ");
}
/* later we'll test for this before closing */
sinkfp = (FILE *)NULL;
/*
* Read the message headers and ship them to the
* output sink.
*/
ok = readheaders(sock, len, msgsizes[num-1],
ctl, num);
if (ok == PS_RETAINED)
suppress_forward = retained = TRUE;
else if (ok == PS_TRANSIENT)
suppress_delete = suppress_forward = TRUE;
else if (ok == PS_REFUSED)
suppress_forward = TRUE;
else if (ok)
goto cleanUp;
set_timeout(ctl->server.timeout);
/*
* If we're using IMAP4 or something else that
* can fetch headers separately from bodies,
* it's time to request the body now. This
* fetch may be skipped if we got an anti-spam
* or other PS_REFUSED error response during
* read_headers.
*/
if (protocol->fetch_body)
{
if (outlevel == O_VERBOSE)
fputc('\n', stderr);
if ((ok = (protocol->trail)(sock, ctl, num)))
goto cleanUp;
set_timeout(ctl->server.timeout);
len = 0;
if (!suppress_forward)
{
if ((ok=(protocol->fetch_body)(sock,ctl,num,&len)))
goto cleanUp;
if (outlevel > O_SILENT && !wholesize)
error_build(" (%d body bytes) ", len);
set_timeout(ctl->server.timeout);
}
}
/* process the body now */
if (len > 0)
{
ok = readbody(sock,
ctl,
!suppress_forward,
len);
if (ok == PS_TRANSIENT)
suppress_delete = suppress_forward = TRUE;
else if (ok)
goto cleanUp;
set_timeout(ctl->server.timeout);
/* tell server we got it OK and resynchronize */
if (protocol->trail)
{
if (outlevel == O_VERBOSE)
fputc('\n', stderr);
ok = (protocol->trail)(sock, ctl, num);
if (ok != 0)
goto cleanUp;
set_timeout(ctl->server.timeout);
}
}
/* count # messages forwarded on this pass */
if (!suppress_forward)
dispatches++;
/*
* Check to see if the numbers matched?
*
* Yes, some servers foo this up horribly.
* All IMAP servers seem to get it right, and
* so does Eudora QPOP at least in 2.xx
* versions.
*
* Microsoft Exchange gets it completely
* wrong, reporting compressed rather than
* actual sizes (so the actual length of
* message is longer than the reported size).
* Another fine example of Microsoft brain death!
*
* Some older POP servers, like the old UCB
* POP server and the pre-QPOP QUALCOMM
* versions, report a longer size in the LIST
* response than actually gets shipped up.
* It's unclear what is going on here, as the
* QUALCOMM server (at least) seems to be
* reporting the on-disk size correctly.
*/
if (msgsizes && msglen != msgsizes[num-1])
{
if (outlevel >= O_VERBOSE)
error(0, 0,
"message %d was not the expected length (%d != %d)",
num, msglen, msgsizes[num-1]);
}
/* end-of-message processing starts here */
if (ctl->mda)
{
int rc;
/* close the delivery pipe, we'll reopen before next message */
if (sinkfp)
rc = pclose(sinkfp);
else
rc = 0;
signal(SIGCHLD, sigchld);
if (rc)
{
error(0, -1, "MDA exited abnormally or returned nonzero status");
goto cleanUp;
}
}
else if (!suppress_forward)
{
/* write message terminator */
if (SMTP_eom(ctl->smtp_socket) != SM_OK)
{
error(0, -1, "SMTP listener refused delivery");
ctl->errcount++;
suppress_delete = TRUE;
}
}
fetches++;
}
/*
* At this point in flow of control, either
* we've bombed on a protocol error or had
* delivery refused by the SMTP server
* (unlikely -- I've never seen it) or we've
* seen `accepted for delivery' and the
* message is shipped. It's safe to mark the
* message seen and delete it on the server
* now.
*/
/* tell the UID code we've seen this */
if (ctl->newsaved)
for (idp = ctl->newsaved; idp; idp = idp->next)
if (idp->val.num == num)
MARK_SEEN(idp->val.num);
/* maybe we delete this message now? */
if (retained)
{
if (outlevel > O_SILENT)
error_complete(0, 0, " retained");
}
else if (protocol->delete
&& !suppress_delete
&& (fetch_it ? !ctl->keep : ctl->flush))
{
deletions++;
if (outlevel > O_SILENT)
error_complete(0, 0, " flushed");
ok = (protocol->delete)(sock, ctl, num);
if (ok != 0)
goto cleanUp;
set_timeout(ctl->server.timeout);
#ifdef POP3_ENABLE
delete_str(&ctl->newsaved, num);
#endif /* POP3_ENABLE */
}
else if (outlevel > O_SILENT)
error_complete(0, 0, " not flushed");
/* perhaps this as many as we're ready to handle */
if (NUM_NONZERO(ctl->fetchlimit) && ctl->fetchlimit <= fetches)
goto no_error;
}
}
} while
/*
* Only re-poll if we had some actual forwards, allowed
* deletions and had no errors.
* Otherwise it is far too easy to get into infinite loops.
*/
(dispatches && protocol->retry && !ctl->keep && !ctl->errcount);
}
no_error:
set_timeout(ctl->server.timeout);
ok = (protocol->logout_cmd)(sock, ctl);
/*
* Hmmmm...arguably this would be incorrect if we had fetches but
* no dispatches (due to oversized messages, etc.)
*/
if (ok == 0)
ok = (fetches > 0) ? PS_SUCCESS : PS_NOMAIL;
set_timeout(0);
close(sock);
goto closeUp;
cleanUp:
set_timeout(ctl->server.timeout);
if (ok != 0 && ok != PS_SOCKET)
(protocol->logout_cmd)(sock, ctl);
set_timeout(0);
close(sock);
}
msg = (char *)NULL; /* sacrifice to -Wall */
switch (ok)
{
case PS_SOCKET:
msg = "socket";
break;
case PS_AUTHFAIL:
msg = "authorization";
break;
case PS_SYNTAX:
msg = "missing or bad RFC822 header";
break;
case PS_IOERR:
msg = "MDA";
break;
case PS_ERROR:
msg = "client/server synchronization";
break;
case PS_PROTOCOL:
msg = "client/server protocol";
break;
case PS_LOCKBUSY:
msg = "lock busy on server";
break;
case PS_SMTP:
msg = "SMTP transaction";
break;
case PS_DNS:
msg = "DNS lookup";
break;
case PS_UNDEFINED:
error(0, 0, "undefined");
break;
}
if (ok==PS_SOCKET || ok==PS_AUTHFAIL || ok==PS_SYNTAX
|| ok==PS_IOERR || ok==PS_ERROR || ok==PS_PROTOCOL
|| ok==PS_LOCKBUSY || ok==PS_SMTP)
error(0,-1, "%s error while fetching from %s", msg, ctl->server.pollname);
closeUp:
/* execute post-initialization command, if any */
if (ctl->postconnect && (ok = system(ctl->postconnect)))
{
char buf[80];
sprintf(buf, "post-connection command failed with status %d", ok);
error(0, 0, buf);
if (ok == PS_SUCCESS)
ok = PS_SYNTAX;
}
signal(SIGALRM, sigsave);
return(ok);
}
#if defined(HAVE_STDARG_H)
void gen_send(int sock, const char *fmt, ... )
/* assemble command in printf(3) style and send to the server */
#else
void gen_send(sock, fmt, va_alist)
/* assemble command in printf(3) style and send to the server */
int sock; /* socket to which server is connected */
const char *fmt; /* printf-style format */
va_dcl
#endif
{
char buf [POPBUFSIZE+1];
va_list ap;
if (protocol->tagged)
(void) sprintf(buf, "%s ", GENSYM);
else
buf[0] = '\0';
#if defined(HAVE_STDARG_H)
va_start(ap, fmt) ;
#else
va_start(ap);
#endif
#ifdef HAVE_VSNPRINTF
vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
#else
vsprintf(buf + strlen(buf), fmt, ap);
#endif
va_end(ap);
strcat(buf, "\r\n");
SockWrite(sock, buf, strlen(buf));
if (outlevel == O_VERBOSE)
{
char *cp;
if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
{
char *sp;
sp = cp + strlen(shroud);
*cp++ = '*';
while (*sp)
*cp++ = *sp++;
*cp = '\0';
}
buf[strlen(buf)-2] = '\0';
error(0, 0, "%s> %s", protocol->name, buf);
}
}
int gen_recv(sock, buf, size)
/* get one line of input from the server */
int sock; /* socket to which server is connected */
char *buf; /* buffer to receive input */
int size; /* length of buffer */
{
int oldphase = phase; /* we don't have to be re-entrant */
phase = SERVER_WAIT;
if (SockRead(sock, buf, size) == -1)
{
phase = oldphase;
return(PS_SOCKET);
}
else
{
if (buf[strlen(buf)-1] == '\n')
buf[strlen(buf)-1] = '\0';
if (buf[strlen(buf)-1] == '\r')
buf[strlen(buf)-1] = '\r';
if (outlevel == O_VERBOSE)
error(0, 0, "%s< %s", protocol->name, buf);
phase = oldphase;
return(PS_SUCCESS);
}
}
#if defined(HAVE_STDARG_H)
int gen_transact(int sock, char *fmt, ... )
/* assemble command in printf(3) style, send to server, accept a response */
#else
int gen_transact(int sock, fmt, va_alist)
/* assemble command in printf(3) style, send to server, accept a response */
int sock; /* socket to which server is connected */
const char *fmt; /* printf-style format */
va_dcl
#endif
{
int ok;
char buf [POPBUFSIZE+1];
va_list ap;
int oldphase = phase; /* we don't have to be re-entrant */
phase = SERVER_WAIT;
if (protocol->tagged)
(void) sprintf(buf, "%s ", GENSYM);
else
buf[0] = '\0';
#if defined(HAVE_STDARG_H)
va_start(ap, fmt) ;
#else
va_start(ap);
#endif
#ifdef HAVE_VSNPRINTF
vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap);
#else
vsprintf(buf + strlen(buf), fmt, ap);
#endif
va_end(ap);
strcat(buf, "\r\n");
SockWrite(sock, buf, strlen(buf));
if (outlevel == O_VERBOSE)
{
char *cp;
if (shroud && shroud[0] && (cp = strstr(buf, shroud)))
{
char *sp;
sp = cp + strlen(shroud);
*cp++ = '*';
while (*sp)
*cp++ = *sp++;
*cp = '\0';
}
buf[strlen(buf)-1] = '\0';
error(0, 0, "%s> %s", protocol->name, buf);
}
/* we presume this does its own response echoing */
ok = (protocol->parse_response)(sock, buf);
set_timeout(mytimeout);
phase = oldphase;
return(ok);
}
/* driver.c ends here */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.